Journal Club
En esta sección se listan los árticulos revisados en el “Journal Club” semanal. En esta dinámica, el equipo completo del laboratorio lee un artículo propuesto por un encargado y ese encargado realiza un review para discutir.
An Evaluation of Sampling Methods and Model Forms for Estimating Height-Diameter Relationships in Loblolly Pine Plantations
Item Type Journal Article Author Alexandros A. Arabatzis Author Harold E. Burkhart Abstract Abstract The prediction performance of eight height-diameter regression models was compared for estimating mean stand height when fitted to data selected from 175 loblolly pine (Pinus taeda) sample plots by (i) simple random sampling without replacement, and (ii) stratified random sampling with dbh classes acting as strata. Among the models tested, the nonlinear model of the form H = aeb/D performed best especially when fitted to data selected by simple random sampling. A small gain in precision obtained by stratification into dbh classes was outweighed by a substantial increase in bias due to the arbitrary allocation of numbers of sample trees to the strata. To update existing height-diameter models, it is recommended that new trees be selected and measured on every occasion instead of retaining the same sample trees used previously for model fitting. For. Sci. 38(1):192-198. Date 1992-02-01 Language en Library Catalog DOI.org (Crossref) URL https://academic.oup.com/forestscience/article/38/1/192/4642795 Accessed 9/2/2024, 4:22:53 PM Volume 38 Pages 192-198 Publication Forest Science DOI 10.1093/forestscience/38.1.192 Issue 1 ISSN 0015-749X, 1938-3738 Date Added 11/30/2023, 4:29:25 PM Modified 1/8/2025, 10:25:41 AM Notes:
Revisado por Christian Salas
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A Bayesian model to estimate land surface phenology parameters with harmonized Landsat 8 and Sentinel-2 images
Item Type Journal Article Author Chad Babcock Author Andrew O. Finley Author Nathaniel Looker Date 08/2021 Language en Library Catalog DOI.org (Crossref) URL https://linkinghub.elsevier.com/retrieve/pii/S0034425721001899 Accessed 6/2/2025, 12:23:39 PM Volume 261 Pages 112471 Publication Remote Sensing of Environment DOI 10.1016/j.rse.2021.112471 Journal Abbr Remote Sensing of Environment ISSN 00344257 Date Added 6/2/2025, 12:23:39 PM Modified 6/2/2025, 12:23:39 PM Notes:
Revisado por Denis Valle
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Developing fully compatible taper and volume equations for all stem components of Eucalyptus globoidea Blakely trees in New Zealand
Item Type Journal Article Author Daniel Boczniewicz Author Euan G. Mason Author Justin A. Morgenroth Abstract Background: Individual-tree taper and volume equations are essential for forest management. They provide estimates of volume that are incorporated into plot-level volume equations and also into growth and yield models to estimate volumes per hectare in forest crops. Moreover, taper equations allow forest managers to estimate dimensions of logs that can be cut from stems in their forests when they have measured diameters at breast height and heights of trees in inventories. Compatible taper and volume equations have the property that the same individual tree volume can be estimated either from the tree volume equation or by integrating the taper equation. Durable eucalypt species such as Eucalyptus globoidea Blakely, however, have especially valuable heartwood and so managers require estimates of the volumes and shapes of heartwood zones within trees. Simple overall wood taper and volume equations would therefore be inadequate. Methods: 74 Eucalyptus globoidea trees were destructively sampled in 8 different trial plots throughout New Zealand. Tree ages were 7 to 29 years old, the DBHs were 11 to 67.6 cm and the heights were 7.2 to 35.4 m. All trees were felled and lengths and taper diameters outside bark were measured. To measure taper diameters of heartwood and sapwood, discs were cut at irregular intervals along the stems. Heartwood and sapwood components were identified by applying methyl orange dye and quantified using image analysis. In this study we extended compatibility so that sums of estimated volumes of separate components of stems, bark, sapwood and heartwood, would equal overall tree volume estimates. In addition, taper equations were made for outside bark, inside bark and heartwood that were compatible with their respective volume equations. Parameters of five volume equations for whole stem, whole wood, bark, sapwood, and heartwood were simultaneously estimated. Compatible taper equations for whole stem, stem wood and heartwood were estimated so that they were compatible with the volume equations, thereby creating a fully compatible system. Results: Root mean squared error (RMSE) of volume models were 0.1248298 m3 for heartwood, 0.05496807 m3 for sapwood, 0.1539625 m3 for wood inside bark, 0.1108201 m3 for bark and 0.1439786 m3 for wood including bark. RMSE of taper models was 2.572765 cm for heartwood, 2.348552 cm for wood inside bark and 2.474088 cm for wood including bark. Conclusions: A compatible system of multiple taper and volume equations can be fitted through the simultaneous fitting of parameters with minimal bias and precision levels of ± 0.055-0.154 m3 for volume equations and ± 2.35 to 2.57 cm for taper equations. Leave-one-out cross-validation of the fitted models yielded very similar levels of precision and bias to those encountered when fitting models with the entire dataset. Date 2022-03-21 Library Catalog DOI.org (Crossref) URL https://nzjforestryscience.nz/index.php/nzjfs/article/view/180 Accessed 11/27/2024, 12:35:32 PM Rights http://creativecommons.org/licenses/by/4.0 Volume 52 Publication New Zealand Journal of Forestry Science DOI 10.33494/nzjfs522022x180x Journal Abbr NZJFS ISSN 1179-5395 Date Added 11/27/2024, 12:35:32 PM Modified 11/27/2024, 12:35:32 PM Notes:
Revisado por Natalia Pizarro
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Density‐dependent vulnerability of forest ecosystems to drought
Item Type Journal Article Author Alessandra Bottero Author Anthony W. D'Amato Author Brian J. Palik Author John B. Bradford Author Shawn Fraver Author Mike A. Battaglia Author Lance A. Asherin Editor Harald Bugmann Abstract Summary Climate models predict increasing drought intensity and frequency for many regions, which may have negative consequences for tree recruitment, growth and mortality, as well as forest ecosystem services. Furthermore, practical strategies for minimizing vulnerability to drought are limited. Tree population density, a metric of tree abundance in a given area, is a primary driver of competitive intensity among trees, which influences tree growth and mortality. Manipulating tree population density may be a mechanism for moderating drought‐induced stress and growth reductions, although the relationship between tree population density and tree drought vulnerability remains poorly quantified, especially across climatic gradients. In this study, we examined three long‐term forest ecosystem experiments in two widely distributed North American pine species, ponderosa pine P inus ponderosa (Lawson & C. Lawson) and red pine P inus resinosa (Aiton), to better elucidate the relationship between tree population density, growth and drought. These experiments span a broad latitude and aridity range and include tree population density treatments that have been purposefully maintained for several decades. We investigated how tree population density influenced resistance (growth during drought) and resilience (growth after drought compared to pre‐drought growth) of stand‐level growth during and after documented drought events. Our results show that relative tree population density was negatively related to drought resistance and resilience, indicating that trees growing at lower densities were less vulnerable to drought. This result was apparent in all three forest ecosystems, and was consistent across species, stand age and drought intensity. Synthesis and applications . Our results highlighted that managing pine forest ecosystems at low tree population density represents a promising adaptive strategy for reducing the adverse impacts of drought on forest growth in coming decades. Nonetheless, the broader applicability of our findings to other types of forest ecosystems merits additional investigation. , Our results highlighted that managing pine forest ecosystems at low tree population density represents a promising adaptive strategy for reducing the adverse impacts of drought on forest growth in coming decades. Nonetheless, the broader applicability of our findings to other types of forest ecosystems merits additional investigation.</td> </tr> <tr> <th>Date</th> <td>12/2017</td> </tr> <tr> <th>Language</th> <td>en</td> </tr> <tr> <th>Library Catalog</th> <td>DOI.org (Crossref)</td> </tr> <tr> <th>URL</th> <td><a href="https://besjournals.onlinelibrary.wiley.com/doi/10.1111/1365-2664.12847">https://besjournals.onlinelibrary.wiley.com/doi/10.1111/1365-2664.12847</a></td> </tr> <tr> <th>Accessed</th> <td>6/30/2025, 10:33:29 AM</td> </tr> <tr> <th>Rights</th> <td>http://onlinelibrary.wiley.com/termsAndConditions#vor</td> </tr> <tr> <th>Volume</th> <td>54</td> </tr> <tr> <th>Pages</th> <td>1605-1614</td> </tr> <tr> <th>Publication</th> <td>Journal of Applied Ecology</td> </tr> <tr> <th>DOI</th> <td><a href="http://doi.org/10.1111/1365-2664.12847">10.1111/1365-2664.12847</a></td> </tr> <tr> <th>Issue</th> <td>6</td> </tr> <tr> <th>Journal Abbr</th> <td>Journal of Applied Ecology</td> </tr> <tr> <th>ISSN</th> <td>0021-8901, 1365-2664</td> </tr> <tr> <th>Date Added</th> <td>6/30/2025, 10:33:29 AM</td> </tr> <tr> <th>Modified</th> <td>6/30/2025, 10:33:29 AM</td> </tr> </tbody></table> <h3 class="notes">Notes:</h3> <ul class="notes"> <li id="item_3PQT8XNF"> <div><div data-schema-version="9"><p>Revisado por Christian Salas</p> </div></div> </li> </ul> <h3 class="attachments">Attachments</h3> <ul class="attachments"> <li id="item_GWZUC6EE">doi_10_5061_dryad_cb2d2__v20171122 </li> <li id="item_ZBITWWRF">Full Text </li> </ul>Incorporating crown ratio into taper equations for Loblolly Pine trees
Item Type Journal Article Author Harold Burkhart Author Sally Burton Date 1985 Volume 31 Pages 478 - 484 Publication Forest Sci. Issue 2 Date Added 4/28/2024, 10:01:42 AM Modified 4/28/2024, 10:03:58 AM Notes:
Revisado por Nicolás Campos
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A stochastic height-diameter model for maritime pine ecoregions in Galicia (northwestern Spain)
Item Type Journal Article Author Fernando Castedo Dorado Author Marcos Barrio Anta Author Bernard R. Parresol Author Juan Gabriel Álvarez González Date 07/2005 Library Catalog Crossref URL http://www.edpsciences.org/10.1051/forest:2005042 Accessed 7/7/2025, 11:31:07 AM Extra Publisher: EDP Sciences Volume 62 Pages 455-465 Publication Annals of Forest Science DOI 10.1051/forest:2005042 Issue 5 Journal Abbr Ann. For. Sci. ISSN 1286-4560, 1297-966X Date Added 7/7/2025, 11:31:07 AM Modified 7/7/2025, 11:31:07 AM Notes:
Revisado por Marcos Marivil
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Modelos de perfil de tronco en <i>Nothofagus pumilio</i> (Poepp. et Endl.) Krasser y su utilización en el cálculo del volumen total
Item Type Journal Article Author J.M. Cellini Author G. Martínez Pastur Author E. Wabö Author M.V. Lencinas Date 2002 Volume 11 Publication Investigación Agraria: Sistemas y Recursos Forestales Issue 2 Date Added 6/17/2024, 2:20:36 PM Modified 6/17/2024, 2:23:29 PM Notes:
Revisado por Víctor Pacheco
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Validación de un modelo fustal para Pino insigne
Item Type Journal Article Author Fernando Cox Date 1985 Publication Facultad de Ciencias Agrarias y Forestales Date Added 9/23/2024, 12:17:15 PM Modified 9/23/2024, 12:22:30 PM Notes:
Revisado por Victor Pacheco
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Modeling of tree height–diameter relationships in the Atlantic Forest: effect of forest type on tree allometry
Item Type Journal Article Author Vinicius Costa Cysneiros Author Allan Libanio Pelissari Author Tatiana Dias Gaui Author Luan Demarco Fiorentin Author Daniel Costa De Carvalho Author Telmo Borges Silveira Filho Author Sebastião Do Amaral Machado Abstract Tree height is one of the most important variables for quantitative assessment of forest stocks, but it is difficult to directly measure. Such allometric relationships of trees can vary between geographical regions, however, mainly due to climatic, edaphic, and floristic gradients. Based on the hypothesis that different forest types influence the generic modeling of tree height–diameter relationships on geographical scales, this study aimed to (i) fit equations to estimate tree height in Atlantic Forest types in the state of Rio de Janeiro, Brazil; (ii) compare efficiency and precision between generic and specific equations for forest types; and (iii) test the effect of different forest types and species on the height–diameter relationship. Four allometric models were tested for all forests (generic) and three main forest types (specific). Effects of tree size, forest types, and species on tree height estimation were analyzed using multiple linear models and mixed-effect linear models. A significant effect of forest type and species on tree height was seen, showing the need to apply local specific equations to minimize the effects that are not captured by generic equations. Differences in tree allometry between forest types were associated with temperature, rainfall, soil, and forest structure. These results confirm the effect of the local environment on the height–diameter relationship of trees as found over large scales in tropical forests. Date 12/2020 Language en Short Title Modeling of tree height–diameter relationships in the Atlantic Forest Library Catalog DOI.org (Crossref) URL https://cdnsciencepub.com/doi/10.1139/cjfr-2020-0060 Accessed 7/29/2024, 12:10:43 PM Rights http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Volume 50 Pages 1289-1298 Publication Canadian Journal of Forest Research DOI 10.1139/cjfr-2020-0060 Issue 12 Journal Abbr Can. J. For. Res. ISSN 0045-5067, 1208-6037 Date Added 7/29/2024, 12:10:43 PM Modified 7/29/2024, 12:10:43 PM Notes:
Revisado por Rocío Reinoso
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Converting Volume Equations to Compatible Taper Equations
Item Type Journal Article Author J. P. Demaerschalk Abstract The desirability of developing a system by which taper equations can be derived from existing volume equations is discussed. The general reasoning process by which the taper equation is derived is based on the condition that total volume estimates, based on integration of the taper equation, should be identical to those given by the existing tree volume equation. To demonstrate the principles involved, a logarithmic tree volume equation is converted into a logarithmic taper equation for the commercial species and species groups of British Columbia. Forest Sci. 18:241-245. Date 1972-09-01 Library Catalog Silverchair URL https://doi.org/10.1093/forestscience/18.3.241 Accessed 8/11/2025, 10:13:44 AM Volume 18 Pages 241-245 Publication Forest Science DOI 10.1093/forestscience/18.3.241 Issue 3 Journal Abbr for sci ISSN 0015-749X Date Added 8/11/2025, 10:13:44 AM Modified 8/11/2025, 10:13:44 AM Notes:
Revisado por Christian Salas
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Allometric scaling of plant energetics and population density
Item Type Journal Article Author Brian J. Enquist Author James H. Brown Author Geoffrey B. West Abstract Scaling relationships that describe variation in population density with body size in ecological communities, such as the thinning law in plant ecology1,2,3, can be explained in terms of how individuals use resources as a function of their size. Data for rates of xylem transport as a function of stem diameter show that rates of resource use in individual plants scale as approximately the 3/4 power of body mass, which is the same as metabolic rates of animals4,5,6,7. Here we use this relationship to develop a mechanistic model for relationships between density and mass in resource-limited plants. It predicts that average plant size should scale as the −4/3 power of maximum population density, in agreement with empirical evidence and comparable relationships in animals5,6,8, but significantly less than the −3/2 power predicted by geometric models1. Our model implies that fundamental constraints on metabolic rate are reflected in the scaling of population density and other ecological and evolutionary phenomena, including the finding that resource allocation among species in ecosystems is independent of body size5,6,8. Date 1998-09 Language en Library Catalog www.nature.com URL https://www.nature.com/articles/25977 Accessed 4/30/2025, 12:19:51 PM Rights 1998 Macmillan Magazines Ltd. Extra Publisher: Nature Publishing Group Volume 395 Pages 163-165 Publication Nature DOI 10.1038/25977 Issue 6698 ISSN 1476-4687 Date Added 4/30/2025, 12:19:51 PM Modified 4/30/2025, 12:19:51 PM Tags:
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Revisado por Christian Salas
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Patterns in height-diameter relationships for selected tree species and sites in eastern Texas
Item Type Journal Article Author Mark R Fulton Abstract Relationships between tree height and diameter at breast height were described for 15 species across a range of sites in eastern Texas using a two-parameter equation. Maximum height varied significantly from site to site within a species, but the ratio of initial slope to maximum height was generally constant. Sites favoring tall trees of one species tended to favor tall trees of all species, especially among species found in the overstory. The greatest rates of height growth for a given diameter at breast height increment were found among some midstory and understory species. Date 1999-09-15 Library Catalog cdnsciencepub.com (Atypon) URL https://cdnsciencepub.com/doi/10.1139/x99-103 Accessed 6/17/2024, 2:33:33 PM Extra Publisher: NRC Research Press Volume 29 Pages 1445-1448 Publication Canadian Journal of Forest Research DOI 10.1139/x99-103 Issue 9 Journal Abbr Can. J. For. Res. ISSN 0045-5067 Date Added 6/17/2024, 2:33:33 PM Modified 6/17/2024, 2:33:33 PM Notes:
Revisado por Christian Salas
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Dynamic modelling of tree form
Item Type Journal Article Author Oscar García Abstract [Software: https://cran.r-project.org/package=dyntaper] Tree profile or taper models are an important component of decision support systems for forest management. An extensive body of theory and observations on the mechanisms of tree form development has accumulated over the last 150 years. Quantitative mensurational models, however, have made little use of that information. Taper models remain largely empirical and static, describing tree dimensions and shape at one point in time. Here taper equations are derived from simplified models of radial stem growth consistent with physiological knowledge. It is expected that this approach may improve accuracy, especially when stands are subjected to varied density management alternatives. Date 2015-01-01 Library Catalog ResearchGate Volume 7 Pages 9-15 Publication Mathematical and Computational Forestry and Natural-Resource Sciences Journal Abbr Mathematical and Computational Forestry and Natural-Resource Sciences Date Added 5/28/2024, 12:34:26 PM Modified 5/28/2024, 12:34:26 PM Notes:
Revisado por Nicolás Campos
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Modelos fustales para renovales de roble, raulí y coigüe en Chile
Item Type Journal Article Author Salvador A. Gezan Author Paulo C. Moreno M Author Alicia Ortega Date 00/2009 Library Catalog SciELO URL http://www.scielo.cl/scielo.php?script=sci_abstract&pid=S0717-92002009000200001&lng=es&nrm=iso&tlng=en Accessed 4/18/2024, 7:40:42 AM Extra Publisher: Universidad Austral de Chile Volume 30 Pages 61-69 Publication Bosque (Valdivia) DOI 10.4067/S0717-92002009000200001 Issue 2 ISSN 0717-9200 Date Added 4/18/2024, 7:40:42 AM Modified 6/13/2024, 1:09:21 PM Tags:
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Revisado por Christian Salas. Se acepta.
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A crown ratio model for Austrian forests
Item Type Journal Article Author Hubert Hasenauer Author Robert A. Monserud Abstract A crown ratio model for individual trees is developed for all major tree species in Austria. The study is part of a comprehensive project developing a distance-independent single tree growth simulator for the full range of stand conditions in Austria. Data were obtained from the Austrian National Forest Inventory and consist of more than 42 000 trees growing on over 5000 permanent plots measured during 1981 and 1985. Crown ratio was predicted using nonlinear regression with a logistic function. The argument of the logistic was a linear combination of tree size characteristics, stand density measures, and topographic site factors. The total variation explained by the model varied from 49% for larch to 17% for the ‘other broadleaf species’. The model explained 41% of the variation in crown ratio for the principal species, Norway spruce. The model explained less than a quarter of the variation for all the broadleaf species and for stone pine. The effect of the size variables is approximately equal in importance to the variables representing competition for the major species. The set of topographic site factors explained the least amount of variation, less than 10% in all cases. Because the height/diameter ratio, the most important size variable, can also be considered to be an integrator of past competition, the crown ratio model is dominated by competition measures. A validation test using independent data from permanent research plots for the main species (Norway spruce, white fir, Scots pine, and beech) demonstrated that the models appear to be well behaved and robust for both pure even-aged and mixed uneven-aged stand types in Austria. Analyses of the residuals from permanent research plots representing a wide variety of thinning treatments indicate that the effect of management seems to be adequately represented by the model. Date 1996-08-01 Library Catalog ScienceDirect URL https://www.sciencedirect.com/science/article/pii/0378112796037681 Accessed 7/26/2025, 7:25:14 PM Volume 84 Pages 49-60 Publication Forest Ecology and Management DOI 10.1016/0378-1127(96)03768-1 Issue 1 Journal Abbr Forest Ecology and Management ISSN 0378-1127 Date Added 7/26/2025, 7:25:14 PM Modified 7/26/2025, 7:25:14 PM Tags:
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Revisado por Nicolás Clavero
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Stem taper equations for poplars growing on farmland in Sweden
Item Type Journal Article Author Birger Hjelm Date 3/2013 Language en Library Catalog DOI.org (Crossref) URL http://link.springer.com/10.1007/s11676-012-0270-4 Accessed 10/1/2024, 5:08:20 PM Rights http://www.springer.com/tdm Volume 24 Pages 15-22 Publication Journal of Forestry Research DOI 10.1007/s11676-012-0270-4 Issue 1 Journal Abbr Journal of Forestry Research ISSN 1007-662X, 1993-0607 Date Added 10/1/2024, 5:08:20 PM Modified 10/1/2024, 5:08:20 PM Notes:
Revisado por Nicolás Campos
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Modeling Tree Crown Ratio
Item Type Journal Article Author Margaret R. Holdaway Abstract The crown ratio (the ratio of live crown length to total height) of an individual tree in a stand can be predicted from commonly measured stand and tree variables. For example, the ratio can be estimated using a nonlinear model combining stand basal area (BA) and initial tree diameter (DBH). The first term reflects the importance of competition on crown ratio; the second term differentiates among trees of different sizes.Biologically reasonable behavior is exhibited by the crown ratio model. The core model, with only two parameters, is very flexible; the full model, with four parameters, is capable of describing a full range of logical crown ratio growth patterns. When extrapolated, this nonlinear model continues to be biologically reasonable. In addition, the parameters are capable of theoretical interpretation.When tested on a Lake States data base of over 150 000 trees, the moan crown ratio estimation error was small, −2% for softwoods and +3% for hardwoods. Variation in weather and survey crew effects did not appear to contribute to errors in crown ratio estimation, although errors in crown ratio prediction did vary by region. Date 1986-10 Library Catalog pubs.cif-ifc.org (Atypon) URL https://pubs.cif-ifc.org/doi/10.5558/tfc62451-5 Accessed 11/4/2024, 11:50:05 AM Extra Publisher: Canadian Institute of Forestry Volume 62 Pages 451-455 Publication The Forestry Chronicle DOI 10.5558/tfc62451-5 Issue 5 ISSN 0015-7546 Date Added 11/4/2024, 11:50:05 AM Modified 11/4/2024, 11:50:05 AM Notes:
Revisado por Nicolás Clavero
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Comparison of Nonlinear Height Diameter Functions for Major Alberta Tree Species
Item Type Journal Article Author SH Huang Author Stephen Titus Author Douglas Wiens Abstract Twenty nonlinear height–diameter functions were fitted and evaluated for major Alberta species based on a data set consisting of 13 489 felled trees for 16 different species. All functions were fitted using weighted nonlinear least squares regression (w i = 1/DBH i ) because of the problem of unequal error variance. The examination and comparison of the weighted mean squared errors, the asymptotic t-statistics for the parameters, and the plots of studentized residuals against the predicted height show that many concave and sigmoidal functions can be used to describe the height–diameter relationships. The sigmoidal functions such as the Weibull-type function, the modified logistic function, the Chapman–Richards function, and the Schnute function generally gave the most satisfactory results. Date 1992-09-01 Library Catalog ResearchGate Volume 22 Pages 1297-1304 Publication Canadian Journal of Forest Research-revue Canadienne De Recherche Forestiere - CAN J FOREST RES DOI 10.1139/x92-172 Journal Abbr Canadian Journal of Forest Research-revue Canadienne De Recherche Forestiere - CAN J FOREST RES Date Added 6/17/2024, 2:26:54 PM Modified 6/17/2024, 2:26:54 PM Notes:
Revisado por Christian Salas
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Developing taper equations for planted teak (Tectona grandis L.f.) trees of central lowland Nepal
Item Type Journal Article Author Anil Koirala Author Cristian R. Montes Author Bronson P. Bullock Author Bishnu H. Wagle Date 09/2021 Language en Library Catalog DOI.org (Crossref) URL https://linkinghub.elsevier.com/retrieve/pii/S266671932100042X Accessed 6/24/2024, 5:31:32 PM Volume 5 Pages 100103 Publication Trees, Forests and People DOI 10.1016/j.tfp.2021.100103 Journal Abbr Trees, Forests and People ISSN 26667193 Date Added 6/24/2024, 5:31:32 PM Modified 6/24/2024, 5:31:32 PM Notes:
Revisado por Nicolás Campos
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Estimating stump volume, stump inside bark diameter and diameter at breast height from stump measurements
Item Type Journal Article Author Antal Kozak Author Stephen A. Y. Omule Abstract Equations were derived for estimating stump volume, stump inside bark diameter at any given height from ground and diameter at breast height from measured stump height and stump inside bark diameter. The equations were tested on 33 British Columbia commercial tree species groups and the results of four species groups are presented in this paper. This prediction system will play an important role in "waste" or "residue" surveys in British Columbia and in reconstructing the initial stand conditions by estimating diameter at breast height. Date 1992-10-01 Language en Library Catalog DOI.org (Crossref) URL http://pubs.cif-ifc.org/doi/10.5558/tfc68623-5 Accessed 10/30/2024, 10:05:21 AM Volume 68 Pages 623-627 Publication The Forestry Chronicle DOI 10.5558/tfc68623-5 Issue 5 Journal Abbr The Forestry Chronicle ISSN 0015-7546, 1499-9315 Date Added 10/30/2024, 10:05:21 AM Modified 10/30/2024, 10:05:21 AM Notes:
Revisado por Marcos Marivil
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A simple stem taper model with mixed effects for boreal black spruce
Item Type Journal Article Author Geneviève Lejeune Author Chhun-Huor Ung Author Mathieu Fortin Author Xiao Jing Guo Author Marie-Claude Lambert Author Jean-Claude Ruel Abstract We simplified Kozak’s taper model by setting the inflection point at 1.3 m (dbh) without losing accuracy and precision. The simplification was required to facilitate the estimation of the covariance parameters when using a mixed-effects method. This method was necessary to take into account the correlation among multiple diameter measurements on an individual stem. The simple stem taper model was fitted to an extended data set collected across the province of Quebec, Canada. Comparison of the predicted stem taper and the derived stem volume with those obtained using existing models showed a comparable predictive power for the simple model. Including a prediction of the tree random effects based on supplementary diameter measurements of the bole improves the predictive ability of the model around the extra diameter observation. This model offers welcome simplicity as a means of predicting tree taper at coarse resolution for planning tree harvesting. Date 2009-09-01 Language en Library Catalog Springer Link URL https://doi.org/10.1007/s10342-009-0300-8 Accessed 8/12/2024, 11:16:53 AM Volume 128 Pages 505-513 Publication European Journal of Forest Research DOI 10.1007/s10342-009-0300-8 Issue 5 Journal Abbr Eur J Forest Res ISSN 1612-4677 Date Added 8/12/2024, 11:16:53 AM Modified 8/12/2024, 11:16:53 AM Tags:
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Revisado por Nicolás Campos
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Comparison of model forms for estimating stem taper and volume in the primary conifer species of the North American Acadian Region
Item Type Journal Article Author Rongxia Li Author Aaron R. Weiskittel Date 01/2010 Language en Library Catalog DOI.org (Crossref) URL https://annforsci.biomedcentral.com/articles/10.1051/forest/2009109 Accessed 6/17/2024, 2:37:46 PM Rights https://www.springer.com/tdm Volume 67 Pages 302-302 Publication Annals of Forest Science DOI 10.1051/forest/2009109 Issue 3 Journal Abbr Ann. For. Sci. ISSN 1286-4560, 1297-966X Date Added 6/17/2024, 2:37:46 PM Modified 6/17/2024, 2:37:46 PM Notes:
Revisado por Víctor Pacheco
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Regional Stem Taper Equations for Eleven Conifer Species in the Acadian Region of North America: Development and Assessment
Item Type Journal Article Author Rongxia Li Author Aaron Weiskittel Author Adam R. Dick Author John A. Kershaw Author Robert S. Seymour Date 2012-03-01 Language en Short Title Regional Stem Taper Equations for Eleven Conifer Species in the Acadian Region of North America Library Catalog DOI.org (Crossref) URL https://academic.oup.com/njaf/article/29/1/5-14/4774246 Accessed 5/10/2025, 10:22:59 AM Volume 29 Pages 5-14 Publication Northern Journal of Applied Forestry DOI 10.5849/njaf.10-037 Issue 1 Journal Abbr Northern Journal of Applied Forestry ISSN 07426348 Date Added 5/10/2025, 10:22:59 AM Modified 5/10/2025, 10:22:59 AM Notes:
Revisado por Nicolás Campos
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Development of Crown Ratio and Height to Crown Base Models for Masson Pine in Southern China
Item Type Journal Article Author Yao Li Author Wei Wang Author Weisheng Zeng Author Jianjun Wang Author Jinghui Meng Abstract Crown ratio (CR) and height to crown base (HCB) are important crown characteristics influencing the behavior of forest canopy fires. However, the labor-intensive and costly measurement of CR and HCB have hindered their wide application to forest fire management. Here, we use 301 sample trees collected in 11 provinces in China to produce predictive models of CR and HCB for Masson pine forests (Pinus massoniana Lamb.), which are vulnerable to forest canopy fires. We first identified the best basic model that used only diameter at breast height (DBH) and height (H) as independent variables to predict CR and HCB, respectively, from 11 of the most used potential candidate models. Second, we introduced other covariates into the best basic model of CR and HCB and developed the final CR and HCB predictive models after evaluating the model performance of different combinations of covariates. The results showed that the Richards form of the candidate models performed best in predicting CR and HCB. The final CR model included DBH, H, DBH0.5 and height-to-diameter ratio (HDR), while the final HCB model was the best basic model (i.e., it did not contain any other covariates). We hope that our CR and HCB predictive models contribute to the forest crown fire management of Masson pine forests. Date 2020-11-19 Language en Library Catalog DOI.org (Crossref) URL https://www.mdpi.com/1999-4907/11/11/1216 Accessed 8/29/2025, 4:01:37 PM Rights https://creativecommons.org/licenses/by/4.0/ Volume 11 Pages 1216 Publication Forests DOI 10.3390/f11111216 Issue 11 Journal Abbr Forests ISSN 1999-4907 Date Added 8/29/2025, 4:01:37 PM Modified 8/29/2025, 4:01:37 PM Notes:
Revisado por Nicolás Clavero
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A new method for capturing stem taper variation for trees of diverse morphological types
Item Type Journal Article Author David W. MacFarlane Author Aaron R. Weiskittel Abstract Understanding variation in tree stem form is fundamental to both ecological and economic assessments of forest ecosystem structure and function. Stem taper models (STMs) are widely used to describe tree form, but it can be challenging to apply them to trees with stems that diverge from an idealized norm, often leading to the exclusion of many trees from stem taper studies. Here, new “whole-tree” form type classes are advanced as simple and useful groupings for capturing stem form variation of trees of diverse morphological types and tested with a large tree data set without exclusion criteria. New form type classes explained much more of main stem form variation than knowledge of tree species, while “merchantable” form types explained the most variation between trees and stands. Broad-leaved species were much more likely to have complex stem forms than needle-leaved species, but species “evergreenness” was a very weak predictor of stem form variation when tree- and stand-level form variation was accounted for. A new, generalized framework for stem taper modeling is demonstrated, using both species and merchantable form types to capture tree-level random effects. New form types and the STM approach are relatively easy to apply and should be relatively simple to integrate into any conventional forest inventory system. Overall, the study demonstrates the importance of including and accounting for the diversity of observed stem forms in developing STMs. Date 06/2016 Language en Library Catalog DOI.org (Crossref) URL http://www.nrcresearchpress.com/doi/10.1139/cjfr-2016-0018 Accessed 6/8/2025, 6:42:02 PM Rights http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Volume 46 Pages 804-815 Publication Canadian Journal of Forest Research DOI 10.1139/cjfr-2016-0018 Issue 6 Journal Abbr Can. J. For. Res. ISSN 0045-5067, 1208-6037 Date Added 6/8/2025, 6:42:02 PM Modified 6/8/2025, 6:42:02 PM Notes:
Revisado por Victor Pacheco
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Using terrestrial laser scanning data to estimate large tropical trees biomass and calibrate allometric models: A comparison with traditional destructive approach
Item Type Journal Article Author Stéphane Momo Takoudjou Author Pierre Ploton Author Bonaventure Sonké Author Jan Hackenberg Author Sébastien Griffon Author Francois De Coligny Author Narcisse Guy Kamdem Author Moses Libalah Author Gislain Ii Mofack Author Gilles Le Moguédec Author Raphaël Pélissier Author Nicolas Barbier Editor Sean McMahon Date 04/2018 Language en Short Title Using terrestrial laser scanning data to estimate large tropical trees biomass and calibrate allometric models Library Catalog DOI.org (Crossref) URL https://besjournals.onlinelibrary.wiley.com/doi/10.1111/2041-210X.12933 Accessed 5/5/2025, 10:21:32 AM Rights http://onlinelibrary.wiley.com/termsAndConditions#vor Volume 9 Pages 905-916 Publication Methods in Ecology and Evolution DOI 10.1111/2041-210X.12933 Issue 4 Journal Abbr Methods Ecol Evol ISSN 2041-210X, 2041-210X Date Added 5/5/2025, 10:21:32 AM Modified 6/5/2025, 3:52:23 PM Notes:
Revisado por Marcos Marivil
Attachments
Effects of adding tree, stand, and site variables to Kozak's variable-exponent taper equation
Item Type Journal Article Author Charles K. Muhairwe Author Valerie M. LeMay Author Antal Kozak Abstract Crown class, site class, and breast-height age were incorporated into Kozak's variable-exponent taper equation (A. Kozak. 1988. Can. J. For. Res. 18: 1363–1368) for three species: Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco), western red cedar (Thujaplicata Donn), and aspen (Populustremuloides Michx.). For lodgepole pine (Pinuscontorta Dougl.), crown ratio, breast-height age, and quadratic mean diameter were incorporated into Kozak's taper equation. The effects of adding these variables to the exponent part of the taper equation on the prediction abilities of the taper model were assessed for prediction of diameter inside bark along the stem, total tree volume, and tree merchantable height. It was found that apart from the use of crown ratio for lodgepole pine, the additional variables resulted in only marginal improvements to the published version of Kozak's taper function. Therefore, the cost of measuring these additional variables is not justifiable. Date 1994-02 Library Catalog cdnsciencepub.com (Atypon) URL https://cdnsciencepub.com/doi/10.1139/x94-037 Accessed 4/21/2024, 3:08:54 PM Extra Publisher: NRC Research Press Volume 24 Pages 252-259 Publication Canadian Journal of Forest Research DOI 10.1139/x94-037 Issue 2 Journal Abbr Can. J. For. Res. ISSN 0045-5067 Date Added 4/21/2024, 3:08:54 PM Modified 4/21/2024, 3:08:54 PM Notes:
Revisado por Nicolás Campos
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Size-dependent Allometry of Tree Height, Diameter and Trunk-taper
Item Type Journal Article Author K. Niklas Date 1995 Volume 75 Pages 217–227 Publication Annals of Botany Date Added 11/30/2023, 4:29:35 PM Modified 11/30/2023, 4:29:35 PM Notes:
Revisado por Rocío Reinoso
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Funciones de perfil del tronco y tarifas de cubicación con clasificación de productos para Pinus sylvestris L. en Galicia
Item Type Journal Article Author N. Novo Author Alberto Rojo-Alboreca Author J. González Abstract Twenty one taper functions from seven different groups of models (single polynomials, segmented polynomials, potential, exponential, variable exponent, trigonometric and logarithmic taper functions) were fitted to a sample of 1694 diameter data. Diameter was measured at different heights of 163 Pinus sylvestris L. type trees of different ages and different site qualities from Galicia (Northest of Spain). The adjusted equations were compared and validated through an independent sample of 565 data of diameter-height from 73 type trees. A volume equation with product classification including the chosen exponential taper equation was developed. Date 2003-01-01 Library Catalog ResearchGate Volume 12 Pages 123-136 Publication Investigación agraria. Sistemas y recursos forestales Journal Abbr Investigación agraria. Sistemas y recursos forestales Date Added 6/17/2024, 2:40:30 PM Modified 6/17/2024, 2:40:30 PM Notes:
Revisado por Víctor pacheco
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Diameter, Height, Crown, and Age Relationship in Eight Neotropical Tree Species
Item Type Journal Article Author Sean T. O'Brien Author Stephen P. Hubbell Author Peter Spiro Author R. Condit Author Robin B. Foster Date 1995 Volume 76 Pages 1926–1939 Publication Ecology Issue 6 Date Added 11/30/2023, 4:29:40 PM Modified 11/30/2023, 4:29:40 PM Notes:
Revisado por Rocío Reinoso
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Spatial validation reveals poor predictive performance of large-scale ecological mapping models
Item Type Journal Article Author Pierre Ploton Author Frédéric Mortier Author Maxime Réjou-Méchain Author Nicolas Barbier Author Nicolas Picard Author Vivien Rossi Author Carsten Dormann Author Guillaume Cornu Author Gaëlle Viennois Author Nicolas Bayol Author Alexei Lyapustin Author Sylvie Gourlet-Fleury Author Raphaël Pélissier Abstract Abstract Mapping aboveground forest biomass is central for assessing the global carbon balance. However, current large-scale maps show strong disparities, despite good validation statistics of their underlying models. Here, we attribute this contradiction to a flaw in the validation methods, which ignore spatial autocorrelation (SAC) in data, leading to overoptimistic assessment of model predictive power. To illustrate this issue, we reproduce the approach of large-scale mapping studies using a massive forest inventory dataset of 11.8 million trees in central Africa to train and validate a random forest model based on multispectral and environmental variables. A standard nonspatial validation method suggests that the model predicts more than half of the forest biomass variation, while spatial validation methods accounting for SAC reveal quasi-null predictive power. This study underscores how a common practice in big data mapping studies shows an apparent high predictive power, even when predictors have poor relationships with the ecological variable of interest, thus possibly leading to erroneous maps and interpretations. Date 2020-09-11 Language en Library Catalog DOI.org (Crossref) URL https://www.nature.com/articles/s41467-020-18321-y Accessed 4/2/2025, 11:38:48 AM Volume 11 Pages 4540 Publication Nature Communications DOI 10.1038/s41467-020-18321-y Issue 1 Journal Abbr Nat Commun ISSN 2041-1723 Date Added 4/2/2025, 11:38:48 AM Modified 4/2/2025, 11:38:48 AM Notes:
Revisado por Denis Valle
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Evaluating published approaches for modelling diameter at breast height from stump dimensions
Item Type Journal Article Author Nan C. Pond Author Robert E. Froese Date 2014-12-01 Language en Library Catalog DOI.org (Crossref) URL https://academic.oup.com/forestry/article-lookup/doi/10.1093/forestry/cpu029 Accessed 6/30/2024, 8:15:54 PM Volume 87 Pages 683-696 Publication Forestry: An International Journal of Forest Research DOI 10.1093/forestry/cpu029 Issue 5 ISSN 0015-752X, 1464-3626 Date Added 6/30/2024, 8:15:54 PM Modified 6/30/2024, 8:15:54 PM Notes:
Revisado por Marcos Marivil
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Modelo de ahusamiento para Eucalyptus nitens, en suelos de cenizas volcánicas de la región de La Araucanía (Chile)
Item Type Journal Article Author J Andrés Rodríguez Toro Author Rafael Rubilar Author F. Muñoz Author Eduardo Cartes Author Eduardo Acuña Author Jorge Cancino-Cancino Abstract Se presenta un modelo de ahusamiento para Eucalyptus nitens (Deane & Maiden) Maiden. Este es un modelo no lineal que fue ajustado con datos de 60 árboles con edades entre los 16 y 21 años, diámetros normales entre 11,5 y 52,0 cm, y con alturas totales entre 12,27 y 47,49 m. Cosechados en 6 rodales localizados en 3 comunas de la región de La Araucanía (Chile); en suelos de cenizas volcánicas. El modelo se contrastó con los existentes en la literatura, obteniendo la mejor precisión, el menor sesgo en cada fracción de altura, y la mayor eficiencia predictiva con un comportamiento gráfico flexible y estable en toda la longitud del fuste. La función de volumen obtenida de la integración numérica del modelo de ahusamiento, predice más de 99% del volumen del fuste sin corteza estimado mediante la fórmula de Smalian. Date 2016-06-01 Library Catalog ResearchGate Volume 48 Pages 101-114 Publication Revista de la Facultad de Ciencias Agrarias Journal Abbr Revista de la Facultad de Ciencias Agrarias Date Added 6/13/2024, 2:08:56 PM Modified 6/13/2024, 2:08:56 PM Notes:
Revisado por Víctor Pacheco
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Comparing strategies for modeling individual-tree height and height-to-crown base increment in mixed-species Acadian forests of northeastern North America
Item Type Journal Article Author Matthew B. Russell Author Aaron R. Weiskittel Author John A. Kershaw Date 11/2014 Language en Library Catalog DOI.org (Crossref) URL http://link.springer.com/10.1007/s10342-014-0827-1 Accessed 5/24/2025, 8:04:32 PM Volume 133 Pages 1121-1135 Publication European Journal of Forest Research DOI 10.1007/s10342-014-0827-1 Issue 6 Journal Abbr Eur J Forest Res ISSN 1612-4669, 1612-4677 Date Added 5/24/2025, 8:04:32 PM Modified 5/24/2025, 8:04:32 PM Notes:
Revisado por Nicolás Clavero
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Ajuste y validación de ecuaciones de volumen para un relicto del bosque de Roble-Laurel-Lingue
Item Type Journal Article Author Christian Salas Eljatib Date 07/2002 Language en Library Catalog DOI.org (Crossref) URL http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-92002002000200009&lng=en&nrm=iso&tlng=en Accessed 7/22/2024, 9:18:43 AM Volume 23 Publication Bosque (Valdivia) DOI 10.4067/S0717-92002002000200009 Issue 2 Journal Abbr Bosque (Valdivia) ISSN 0717-9200 Date Added 7/22/2024, 9:18:43 AM Modified 7/22/2024, 9:18:43 AM Notes:
Revisado por Christian Salas
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A Cruising Computer for Variable Plots, Tree Heights, and Slope Correction
Item Type Journal Article Author Albert R. Stage Date 1959-11-01 Library Catalog Silverchair URL https://doi.org/10.1093/jof/57.11.835 Accessed 11/26/2024, 9:14:08 PM Volume 57 Pages 835-836 Publication Journal of Forestry DOI 10.1093/jof/57.11.835 Issue 11 Journal Abbr Journal of Forestry ISSN 0022-1201 Date Added 11/26/2024, 9:14:08 PM Modified 11/26/2024, 9:14:08 PM Notes:
Revisado por Christian Salas
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Height prediction equations using diameter and stand density measures
Item Type Journal Article Author Christie Staudhammer Author Valerie LeMay Abstract Height equations for western hemlock (Tsuga heterophylla (Raf.) Sarg.), western red cedar (Thuja plicata Donn), Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco), and alder (Alnus rubra Bong. and Alnus tenuifolia Nutt.) were fitted using dbh as the predictor variable. A simple, non-linear equation gave very similar results to the Weibull distribution, except for hemlock, which was better modelled using the more flexible Weibull distribution function. Introducing stand density variables into the base equations resulted in increased accuracy for predicting heights of alder. Smaller improvements were found for Douglas-fir, cedar, and hemlock. Key words: estimating height, Coastal BC, Weibull estimation, stand density measures Date 2000-04-01 Language en Library Catalog DOI.org (Crossref) URL http://pubs.cif-ifc.org/doi/10.5558/tfc76303-2 Accessed 9/13/2024, 12:25:05 PM Volume 76 Pages 303-309 Publication The Forestry Chronicle DOI 10.5558/tfc76303-2 Issue 2 Journal Abbr The Forestry Chronicle ISSN 0015-7546, 1499-9315 Date Added 11/30/2023, 4:29:16 PM Modified 1/8/2025, 10:24:55 AM Notes:
Revisado por Rocío Reinoso. Aceptado con observaciones.
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Ecuaciones locales y generalizadas de altura-diámetro para pino radiata (Pinus radiata)
Item Type Journal Article Author Guillermo Trincado Author Cristián Leal D Date 00/2006 Library Catalog SciELO URL http://www.scielo.cl/scielo.php?script=sci_abstract&pid=S0717-92002006000100003&lng=es&nrm=iso&tlng=es Accessed 6/13/2024, 1:10:35 PM Extra Publisher: Universidad Austral de Chile Volume 27 Pages 23-34 Publication Bosque DOI 10.4067/S0717-92002006000100003 Issue 1 ISSN 0717-9200 Date Added 6/13/2024, 1:10:35 PM Modified 7/10/2025, 5:09:01 PM Notes:
Revisado por Rocío Reinoso
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Estimación de volumen comercial en latifoliadas
Item Type Journal Article Author Guillermo Trincado Author Klaus von Gadow Author Víctor Sandoval Date 1997 Language Español Volume 18 Pages 39-44 Publication Bosque DOI 10.4206/bosque.1997.v18n1-05 Issue 1 Date Added 7/10/2025, 4:58:33 PM Modified 7/14/2025, 12:51:58 PM Notes:
Revisado por Nicolas Campos
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Comparison of Three Stem Profile Equations for <i>Quercus robur</i> L.
Item Type Journal Article Author G. Trincado Author K. V. Gadow Author V. P. Tewari Date 11/1996 Language en Library Catalog DOI.org (Crossref) URL http://www.tandfonline.com/doi/abs/10.1080/00382167.1996.9629715 Accessed 7/30/2025, 10:18:22 AM Volume 177 Pages 23-29 Publication South African Forestry Journal DOI 10.1080/00382167.1996.9629715 Issue 1 Journal Abbr South African Forestry Journal ISSN 0038-2167 Date Added 7/30/2025, 10:18:22 AM Modified 7/30/2025, 10:18:22 AM Notes:
Revisado por Víctor Pacheco
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Local uncertainty maps for land-use/land-cover classification without remote sensing and modeling work using a class-conditional conformal approach
Item Type Journal Article Author Denis Valle Author Rodrigo Leite Author Rafael Izbicki Author Carlos Silva Author Leo Haneda Abstract Land use/land cover (LULC) is one of the most impactful global change phenomenon. As a result, considerable effort has been devoted to creating large-scale LULC products from remote sensing data, enabling the scientific community to use these products for a wide range of downstream applications. Unfortunately, uncertainty associated with these products is seldom quantified because most approaches are too computationally intensive. Furthermore, uncertainty maps developed for large regions might fail to perform adequately at the spatial scale in which they will be used and might need to be customized to suit the specific applications of end-users. In this study, we describe the class-conditional conformal statistics method, an approach that quantifies uncertainty more uniformly for each class but that requires more calibration data than the conventional conformal method. Using the class-conditional method, we show that it is possible to create customized local uncertainty maps using local calibration data without requiring remote sensing and modeling work and that these local uncertainty maps outperform uncertainty maps calibrated based on global data. We use empirical data from Brazil (i.e., Dynamic World LULC product and Mapbiomas validation data) to demonstrate this methodology. The analysis of these data reveals substantial heterogeneity in observations of the same LULC class between Brazilian states, an indication that national-level data are not representative of the focal state, thus explaining why uncertainty maps calibrated using focal state-level data outperform maps calibrated using national-level data. Importantly, we develop straight-forward approaches to determine the spatial extent over which calibration data are still representative of the area of interest, ensuring that these data can be used to reliably quantify uncertainty. We illustrate the class-conformal methodology by creating uncertainty maps for a selected number of sites in Brazil. Finally, we show how these uncertainty maps can yield valuable insights for LULC map producers. Our methodology paves the way for users to generate customized local uncertainty maps that are likely to be better than uncertainty maps calibrated based on global data while at the same time being more relevant for the specific applications of these users. A tutorial is provided to show how this methodology can be implemented without requiring remote sensing and modeling expertise to generate uncertainty maps. Date 2024-12-01 Library Catalog ScienceDirect URL https://www.sciencedirect.com/science/article/pii/S1569843224006447 Accessed 4/30/2025, 12:24:15 PM Volume 135 Pages 104288 Publication International Journal of Applied Earth Observation and Geoinformation DOI 10.1016/j.jag.2024.104288 Journal Abbr International Journal of Applied Earth Observation and Geoinformation ISSN 1569-8432 Date Added 4/30/2025, 12:24:15 PM Modified 4/30/2025, 12:24:15 PM Tags:
Notes:
Revisado por Denis Valle
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New Models for Predicting Diameter at Breast Height from Stump Dimensions
Item Type Journal Article Author James A. Westfall Abstract Abstract Models to predict dbh from stump dimensions are presented for 18 species groups. Data used to fit the models were collected across thirteen states in the northeastern United States. Primarily because of the presence of multiple measurements from each tree, a mixed-effects modeling approach was used to account for the lack of independence among observations. The heterogeneous error variance was described as a function of stump diameter, which allowed for more accurate representation of prediction intervals. Application of the mean response model (fixed-effects parameters only) to independent data indicated an average absolute error between 0.2 and 0.7 in. for most groups. An additional advantage is that random-effect parameters allow the model to be calibrated to local conditions if some additional data are available. An example is provided that indicates the local calibration results in a mean residual value that is closer to zero compared with the mean response model. Efforts in other locales to use stump information to inform dbh predictions can obtain the same advancements by adopting a similar modeling methodology. Date 2010-03-01 Language en Library Catalog DOI.org (Crossref) URL https://academic.oup.com/njaf/article/27/1/21/4774230 Accessed 8/19/2024, 1:22:34 PM Volume 27 Pages 21-27 Publication Northern Journal of Applied Forestry DOI 10.1093/njaf/27.1.21 Issue 1 ISSN 0742-6348, 1938-3762 Date Added 8/19/2024, 1:22:34 PM Modified 8/19/2024, 1:22:34 PM Notes:
Revisado por Marcos Marivil
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Comparison of Data Grouping Strategies on Prediction Accuracy of Tree-Stem Taper for Six Common Species in the Southeastern US
Item Type Journal Article Author Sheng-I Yang Author P. Corey Green Abstract Clustering data into similar characteristic groups is a commonly-used strategy in model development. However, the impact of data grouping strategies on modeling stem taper has not been well quantified. The objective of this study was to compare the prediction accuracy of different data grouping strategies. Specifically, a population-level model was compared to the models fitted with grouped data based on taxonomic rank, tree form and size. A total of 3678 trees were used in the analyses, which included six common species in upland hardwood forests of the southeastern U.S. Results showed that overall predictions are more accurate when building stem taper models at the species, species group or division level rather than at the population level. The prediction accuracy was not considerably improved between species-specific functions and models fitted with species-related groups for the four hardwood species examined. Grouping data by taxonomic rank provided more reliable predictions than height-to-diameter ratio (H–D ratio) or diameter at breast height (DBH). The form/size-related grouping methods (i.e., data grouped by H–D ratio or DBH) generally did not improve the prediction precision compared to a population-level model. In this study, the effect of sample size in model fitting showed a minimal impact on prediction accuracy. The methodology presented in this study provides a modeling strategy for mixed-species data, which will be of practical importance when data grouping is needed for developing stem taper models. Date 2022-01-20 Language en Library Catalog DOI.org (Crossref) URL https://www.mdpi.com/1999-4907/13/2/156 Accessed 8/8/2024, 11:00:09 AM Rights https://creativecommons.org/licenses/by/4.0/ Volume 13 Pages 156 Publication Forests DOI 10.3390/f13020156 Issue 2 Journal Abbr Forests ISSN 1999-4907 Date Added 8/8/2024, 11:00:09 AM Modified 8/8/2024, 11:00:09 AM Notes:
Revisado por Víctor Pacheco
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Cross-validation of non-linear growth functions for modelling tree height-diameter relationships
Item Type Journal Article Author L. Zhang Date 1997 Volume 79 Pages 251-257 Publication Annals of Botany Issue 3 Date Added 11/30/2023, 4:29:29 PM Modified 11/30/2023, 4:29:29 PM Notes:
Revisado por Rocío Reinoso
Attachments