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.
Incorporating crown ratio into taper equations for Loblolly Pine trees
Tipo de elemento Artículo de revista académica Autor Harold Burkhart Autor Sally Burton Fecha 1985 Volumen 31 Páginas 478 - 484 Publicación Forest Sci. Número 2 Fecha de adición 28-04-2024, 10:01:42 Modificado 28-04-2024, 10:03:58 Notas:
Revisado por Nicolás Campos
Adjuntos
Elements of Econometrics: Second Edition
Tipo de elemento Libro Autor Jan Kmenta Fecha 1997 Idioma en Título corto Elements of Econometrics Catálogo de biblioteca DOI.org (Crossref) URL https://www.press.umich.edu/15701 Accedido 24-04-2024, 01:02:01 Adicional DOI: 10.3998/mpub.15701 Lugar Ann Arbor, MI Editorial University of Michigan Press ISBN 978-0-472-10886-2 Fecha de adición 24-04-2024, 01:02:01 Modificado 24-04-2024, 01:02:01 Effects of adding tree, stand, and site variables to Kozak's variable-exponent taper equation
Tipo de elemento Artículo de revista académica Autor Charles K. Muhairwe Autor Valerie M. LeMay Autor Antal Kozak Resumen 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. Fecha 1994-02 Catálogo de biblioteca cdnsciencepub.com (Atypon) URL https://cdnsciencepub.com/doi/10.1139/x94-037 Accedido 21-04-2024, 15:08:54 Adicional Publisher: NRC Research Press Volumen 24 Páginas 252-259 Publicación Canadian Journal of Forest Research DOI 10.1139/x94-037 Número 2 Abrev. de revista Can. J. For. Res. ISSN 0045-5067 Fecha de adición 21-04-2024, 15:08:54 Modificado 21-04-2024, 15:08:54 Notas:
Revisado por Nicolás Campos
Adjuntos
Modelos fustales para renovales de roble, raulí y coigüe en Chile
Tipo de elemento Artículo de revista académica Autor Salvador A. Gezan Autor Paulo C. Moreno M Autor Alicia Ortega Fecha 00/2009 Catálogo de biblioteca SciELO URL http://www.scielo.cl/scielo.php?script=sci_abstract&pid=S0717-92002009000200001&lng=es&nrm=iso&tlng=en Accedido 18-04-2024, 07:40:42 Adicional Publisher: Universidad Austral de Chile Volumen 30 Páginas 61-69 Publicación Bosque (Valdivia) DOI 10.4067/S0717-92002009000200001 Número 2 ISSN 0717-9200 Fecha de adición 18-04-2024, 07:40:42 Modificado 13-06-2024, 13:09:21 Etiquetas:
Notas:
Revisado por Christian Salas. Se acepta.
Adjuntos
Dynamics and simulated yield of Douglas-fir
Tipo de elemento Libro Autor Kenneth J. Mitchell Fecha 1975 Idioma eng Catálogo de biblioteca The Open Library Adicional Open Library ID: OL3879032M Lugar Washington, D.C Editorial Society of American Foresters Número de páginas 39 Fecha de adición 28-05-2024, 14:29:38 Modificado 28-05-2024, 14:29:38 Etiquetas:
Notas:
Bibliography: p. 32-33. "Supplement to Forest science, vol. 21, no. 4, December 1975"--P. [1] of cover.
Growth and morphogenesis in the canadian forest species: i. the controls of cambial and apical activity in pinus resinosa ait.
Tipo de elemento Artículo de revista académica Autor G. H. Duff Autor Norah J. Nolan Resumen The anomalous complexity of the annual rings of young trees which generally disqualifies them from use in growth studies is, in P. resinosa, found to arise from a remarkably thorough organization of ring width and therefore of cambial activity in the tree under the influence of intrinsic determinants. The pattern is manifest when the widths of the internodal wood rings of a single year are followed in sequence from internode to internode down the tree from the apex. A similarly patterned view of the rings is obtained when the ring widths are traced in the ring sequence, conventional for growth studies, that passes from ring to ring in a given internode. The controlling intrinsic factors are held to be nutritional gradients in the axis inferred from the distribution of foliage and light along the axis of trees growing in the forest and in the open.In both types of sequence the pattern obscures the variations induced by random extrinsic factors and severely limits the value of these sequences for examining the effect of such factors. This disability can be avoided by the use of a third sequence of ring widths in which each term is the width of a ring which was laid down in an internode different but of the same age at the time of ring formation as the others in the sequence. Such sequences have never been used in growth studies. Yet they are found to be unpatterned and the effect of the fluctuating extrinsic factors can be examined effectively in them and in them alone.The complex relation between the responses of the cambium thus determined and those of the apical growing point to the random extrinsic factors is found to derive from the discontinuity of terminal growth introduced by the winter pause between bud formation and axial extension. These two stages of terminal growth are influenced by the extrinsic factors of the two different years. The effect on the cambium is simpler than this but is determinably related to that on the apical growing point.The results afford the ground for a first advance toward the removal of the disqualification of the use of young trees in studies of growth and of its factorial control. Fecha 1953-07 Título corto Growth and morphogenesis in the canadian forest species Catálogo de biblioteca cdnsciencepub.com (Atypon) URL https://cdnsciencepub.com/doi/10.1139/b53-037 Accedido 28-05-2024, 14:27:34 Adicional Publisher: NRC Research Press Volumen 31 Páginas 471-513 Publicación Canadian Journal of Botany DOI 10.1139/b53-037 Número 4 Abrev. de revista Can. J. Bot. ISSN 0008-4026 Fecha de adición 28-05-2024, 14:27:34 Modificado 28-05-2024, 14:27:34 Adjuntos
Dynamic modelling of tree form
Tipo de elemento Artículo de revista académica Autor Oscar García Resumen [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. Fecha 2015-01-01 Catálogo de biblioteca ResearchGate Volumen 7 Páginas 9-15 Publicación Mathematical and Computational Forestry and Natural-Resource Sciences Abrev. de revista Mathematical and Computational Forestry and Natural-Resource Sciences Fecha de adición 28-05-2024, 12:34:26 Modificado 28-05-2024, 12:34:26 Notas:
Revisado por Nicolás Campos
Adjuntos
Cross-validation of non-linear growth functions for modelling tree height-diameter relationships
Tipo de elemento Artículo de revista académica Autor L. Zhang Fecha 1997 Volumen 79 Páginas 251-257 Publicación Annals of Botany Número 3 Fecha de adición 30-11-2023, 16:29:29 Modificado 30-11-2023, 16:29:29 Notas:
Revisado por Rocío Reinoso
Adjuntos
Size-dependent Allometry of Tree Height, Diameter and Trunk-taper
Tipo de elemento Artículo de revista académica Autor K. Niklas Fecha 1995 Volumen 75 Páginas 217–227 Publicación Annals of Botany Fecha de adición 30-11-2023, 16:29:35 Modificado 30-11-2023, 16:29:35 Notas:
Revisado por Rocío Reinoso
Adjuntos
Diameter, Height, Crown, and Age Relationship in Eight Neotropical Tree Species
Tipo de elemento Artículo de revista académica Autor Sean T. O'Brien Autor Stephen P. Hubbell Autor Peter Spiro Autor R. Condit Autor Robin B. Foster Fecha 1995 Volumen 76 Páginas 1926–1939 Publicación Ecology Número 6 Fecha de adición 30-11-2023, 16:29:40 Modificado 30-11-2023, 16:29:40 Notas:
Revisado por Rocío Reinoso
Adjuntos
Height prediction equations using diameter and stand density measures
Tipo de elemento Artículo de revista académica Autor Christie Staudhammer Autor Valerie LeMay Resumen 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 Fecha 2000-04-01 Idioma en Catálogo de biblioteca DOI.org (Crossref) URL http://pubs.cif-ifc.org/doi/10.5558/tfc76303-2 Accedido 13-09-2024, 12:25:05 Volumen 76 Páginas 303-309 Publicación The Forestry Chronicle DOI 10.5558/tfc76303-2 Número 2 Abrev. de revista The Forestry Chronicle ISSN 0015-7546, 1499-9315 Fecha de adición 30-11-2023, 16:29:16 Modificado 08-01-2025, 10:24:55 Notas:
Revisado por Rocío Reinoso. Aceptado con observaciones.
Adjuntos
An Evaluation of Sampling Methods and Model Forms for Estimating Height-Diameter Relationships in Loblolly Pine Plantations
Tipo de elemento Artículo de revista académica Autor Alexandros A. Arabatzis Autor Harold E. Burkhart Resumen 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. Fecha 1992-02-01 Idioma en Catálogo de biblioteca DOI.org (Crossref) URL https://academic.oup.com/forestscience/article/38/1/192/4642795 Accedido 02-09-2024, 16:22:53 Volumen 38 Páginas 192-198 Publicación Forest Science DOI 10.1093/forestscience/38.1.192 Número 1 ISSN 0015-749X, 1938-3738 Fecha de adición 30-11-2023, 16:29:25 Modificado 08-01-2025, 10:25:41 Notas:
Revisado por Christian Salas
Adjuntos
New Models for Predicting Diameter at Breast Height from Stump Dimensions
Tipo de elemento Artículo de revista académica Autor James A. Westfall Resumen 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. Fecha 2010-03-01 Idioma en Catálogo de biblioteca DOI.org (Crossref) URL https://academic.oup.com/njaf/article/27/1/21/4774230 Accedido 19-08-2024, 13:22:34 Volumen 27 Páginas 21-27 Publicación Northern Journal of Applied Forestry DOI 10.1093/njaf/27.1.21 Número 1 ISSN 0742-6348, 1938-3762 Fecha de adición 19-08-2024, 13:22:34 Modificado 19-08-2024, 13:22:34 Notas:
Revisado por Marcos Marivil
Adjuntos
Variable-exponent taper equations for jack pine, black spruce, and balsam fir in eastern Canada
Tipo de elemento Artículo de revista académica Autor Mahadev Sharma Autor S.Y Zhang Fecha 8/2004 Idioma en Catálogo de biblioteca DOI.org (Crossref) URL https://linkinghub.elsevier.com/retrieve/pii/S0378112704003433 Accedido 14-08-2024, 00:13:44 Derechos https://www.elsevier.com/tdm/userlicense/1.0/ Volumen 198 Páginas 39-53 Publicación Forest Ecology and Management DOI 10.1016/j.foreco.2004.03.035 Número 1-3 Abrev. de revista Forest Ecology and Management ISSN 03781127 Fecha de adición 30-11-2023, 16:30:04 Modificado 08-01-2025, 10:25:02 Adjuntos
Modeling stem taper of three central Oregon species using nonlinear mixed effects models and autoregressive error structures
Tipo de elemento Artículo de revista académica Autor Sean M. Garber Autor Douglas A. Maguire Fecha 07/2003 Idioma en Catálogo de biblioteca DOI.org (Crossref) URL https://linkinghub.elsevier.com/retrieve/pii/S0378112702005285 Accedido 13-08-2024, 23:07:04 Derechos https://www.elsevier.com/tdm/userlicense/1.0/ Volumen 179 Páginas 507-522 Publicación Forest Ecology and Management DOI 10.1016/S0378-1127(02)00528-5 Número 1-3 Abrev. de revista Forest Ecology and Management ISSN 03781127 Fecha de adición 13-08-2024, 23:07:04 Modificado 13-08-2024, 23:07:04 Adjuntos
A simple stem taper model with mixed effects for boreal black spruce
Tipo de elemento Artículo de revista académica Autor Geneviève Lejeune Autor Chhun-Huor Ung Autor Mathieu Fortin Autor Xiao Jing Guo Autor Marie-Claude Lambert Autor Jean-Claude Ruel Resumen 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. Fecha 2009-09-01 Idioma en Catálogo de biblioteca Springer Link URL https://doi.org/10.1007/s10342-009-0300-8 Accedido 12-08-2024, 11:16:53 Volumen 128 Páginas 505-513 Publicación European Journal of Forest Research DOI 10.1007/s10342-009-0300-8 Número 5 Abrev. de revista Eur J Forest Res ISSN 1612-4677 Fecha de adición 12-08-2024, 11:16:53 Modificado 12-08-2024, 11:16:53 Etiquetas:
Notas:
Revisado por Nicolás Campos
Adjuntos
Comparison of Data Grouping Strategies on Prediction Accuracy of Tree-Stem Taper for Six Common Species in the Southeastern US
Tipo de elemento Artículo de revista académica Autor Sheng-I Yang Autor P. Corey Green Resumen 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. Fecha 2022-01-20 Idioma en Catálogo de biblioteca DOI.org (Crossref) URL https://www.mdpi.com/1999-4907/13/2/156 Accedido 08-08-2024, 11:00:09 Derechos https://creativecommons.org/licenses/by/4.0/ Volumen 13 Páginas 156 Publicación Forests DOI 10.3390/f13020156 Número 2 Abrev. de revista Forests ISSN 1999-4907 Fecha de adición 08-08-2024, 11:00:09 Modificado 08-08-2024, 11:00:09 Notas:
Revisado por Víctor Pacheco
Adjuntos
Modeling of tree height–diameter relationships in the Atlantic Forest: effect of forest type on tree allometry
Tipo de elemento Artículo de revista académica Autor Vinicius Costa Cysneiros Autor Allan Libanio Pelissari Autor Tatiana Dias Gaui Autor Luan Demarco Fiorentin Autor Daniel Costa De Carvalho Autor Telmo Borges Silveira Filho Autor Sebastião Do Amaral Machado Resumen 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. Fecha 12/2020 Idioma en Título corto Modeling of tree height–diameter relationships in the Atlantic Forest Catálogo de biblioteca DOI.org (Crossref) URL https://cdnsciencepub.com/doi/10.1139/cjfr-2020-0060 Accedido 29-07-2024, 12:10:43 Derechos http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Volumen 50 Páginas 1289-1298 Publicación Canadian Journal of Forest Research DOI 10.1139/cjfr-2020-0060 Número 12 Abrev. de revista Can. J. For. Res. ISSN 0045-5067, 1208-6037 Fecha de adición 29-07-2024, 12:10:43 Modificado 29-07-2024, 12:10:43 Notas:
Revisado por Rocío Reinoso
Adjuntos
Ajuste y validación de ecuaciones de volumen para un relicto del bosque de Roble-Laurel-Lingue
Tipo de elemento Artículo de revista académica Autor Christian Salas Eljatib Fecha 07/2002 Idioma en Catálogo de biblioteca DOI.org (Crossref) URL http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-92002002000200009&lng=en&nrm=iso&tlng=en Accedido 22-07-2024, 09:18:43 Volumen 23 Publicación Bosque (Valdivia) DOI 10.4067/S0717-92002002000200009 Número 2 Abrev. de revista Bosque (Valdivia) ISSN 0717-9200 Fecha de adición 22-07-2024, 09:18:43 Modificado 22-07-2024, 09:18:43 Notas:
Revisado por Christian Salas
Adjuntos
Evaluating published approaches for modelling diameter at breast height from stump dimensions
Tipo de elemento Artículo de revista académica Autor Nan C. Pond Autor Robert E. Froese Fecha 2014-12-01 Idioma en Catálogo de biblioteca DOI.org (Crossref) URL https://academic.oup.com/forestry/article-lookup/doi/10.1093/forestry/cpu029 Accedido 30-06-2024, 20:15:54 Volumen 87 Páginas 683-696 Publicación Forestry: An International Journal of Forest Research DOI 10.1093/forestry/cpu029 Número 5 ISSN 0015-752X, 1464-3626 Fecha de adición 30-06-2024, 20:15:54 Modificado 30-06-2024, 20:15:54 Notas:
Revisado por Marcos Marivil
Adjuntos
Developing taper equations for planted teak (Tectona grandis L.f.) trees of central lowland Nepal
Tipo de elemento Artículo de revista académica Autor Anil Koirala Autor Cristian R. Montes Autor Bronson P. Bullock Autor Bishnu H. Wagle Fecha 09/2021 Idioma en Catálogo de biblioteca DOI.org (Crossref) URL https://linkinghub.elsevier.com/retrieve/pii/S266671932100042X Accedido 24-06-2024, 17:31:32 Volumen 5 Páginas 100103 Publicación Trees, Forests and People DOI 10.1016/j.tfp.2021.100103 Abrev. de revista Trees, Forests and People ISSN 26667193 Fecha de adición 24-06-2024, 17:31:32 Modificado 24-06-2024, 17:31:32 Notas:
Revisado por Nicolás Campos
Adjuntos
Funciones de perfil del tronco y tarifas de cubicación con clasificación de productos para Pinus sylvestris L. en Galicia
Tipo de elemento Artículo de revista académica Autor N. Novo Autor Alberto Rojo-Alboreca Autor J. González Resumen 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. Fecha 2003-01-01 Catálogo de biblioteca ResearchGate Volumen 12 Páginas 123-136 Publicación Investigación agraria. Sistemas y recursos forestales Abrev. de revista Investigación agraria. Sistemas y recursos forestales Fecha de adición 17-06-2024, 14:40:30 Modificado 17-06-2024, 14:40:30 Notas:
Revisado por Víctor pacheco
Adjuntos
Comparison of model forms for estimating stem taper and volume in the primary conifer species of the North American Acadian Region
Tipo de elemento Artículo de revista académica Autor Rongxia Li Autor Aaron R. Weiskittel Fecha 01/2010 Idioma en Catálogo de biblioteca DOI.org (Crossref) URL https://annforsci.biomedcentral.com/articles/10.1051/forest/2009109 Accedido 17-06-2024, 14:37:46 Derechos https://www.springer.com/tdm Volumen 67 Páginas 302-302 Publicación Annals of Forest Science DOI 10.1051/forest/2009109 Número 3 Abrev. de revista Ann. For. Sci. ISSN 1286-4560, 1297-966X Fecha de adición 17-06-2024, 14:37:46 Modificado 17-06-2024, 14:37:46 Notas:
Revisado por Víctor Pacheco
Adjuntos
Patterns in height-diameter relationships for selected tree species and sites in eastern Texas
Tipo de elemento Artículo de revista académica Autor Mark R Fulton Resumen 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. Fecha 1999-09-15 Catálogo de biblioteca cdnsciencepub.com (Atypon) URL https://cdnsciencepub.com/doi/10.1139/x99-103 Accedido 17-06-2024, 14:33:33 Adicional Publisher: NRC Research Press Volumen 29 Páginas 1445-1448 Publicación Canadian Journal of Forest Research DOI 10.1139/x99-103 Número 9 Abrev. de revista Can. J. For. Res. ISSN 0045-5067 Fecha de adición 17-06-2024, 14:33:33 Modificado 17-06-2024, 14:33:33 Notas:
Revisado por Christian Salas
Adjuntos
Comparison of Nonlinear Height Diameter Functions for Major Alberta Tree Species
Tipo de elemento Artículo de revista académica Autor SH Huang Autor Stephen Titus Autor Douglas Wiens Resumen 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. Fecha 1992-09-01 Catálogo de biblioteca ResearchGate Volumen 22 Páginas 1297-1304 Publicación Canadian Journal of Forest Research-revue Canadienne De Recherche Forestiere - CAN J FOREST RES DOI 10.1139/x92-172 Abrev. de revista Canadian Journal of Forest Research-revue Canadienne De Recherche Forestiere - CAN J FOREST RES Fecha de adición 17-06-2024, 14:26:54 Modificado 17-06-2024, 14:26:54 Notas:
Revisado por Christian Salas
Adjuntos
Modelos de perfil de tronco en <i>Nothofagus pumilio</i> (Poepp. et Endl.) Krasser y su utilización en el cálculo del volumen total
Tipo de elemento Artículo de revista académica Autor J.M. Cellini Autor G. Martínez Pastur Autor E. Wabö Autor M.V. Lencinas Fecha 2002 Volumen 11 Publicación Investigación Agraria: Sistemas y Recursos Forestales Número 2 Fecha de adición 17-06-2024, 14:20:36 Modificado 17-06-2024, 14:23:29 Notas:
Revisado por Víctor Pacheco
Adjuntos
Modelo de ahusamiento para Eucalyptus nitens, en suelos de cenizas volcánicas de la región de La Araucanía (Chile)
Tipo de elemento Artículo de revista académica Autor J Andrés Rodríguez Toro Autor Rafael Rubilar Autor F. Muñoz Autor Eduardo Cartes Autor Eduardo Acuña Autor Jorge Cancino-Cancino Resumen 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. Fecha 2016-06-01 Catálogo de biblioteca ResearchGate Volumen 48 Páginas 101-114 Publicación Revista de la Facultad de Ciencias Agrarias Abrev. de revista Revista de la Facultad de Ciencias Agrarias Fecha de adición 13-06-2024, 14:08:56 Modificado 13-06-2024, 14:08:56 Notas:
Revisado por Víctor Pacheco
Adjuntos
Ecuaciones locales y generalizadas de altura-diámetro para pino radiata (Pinus radiata)
Tipo de elemento Artículo de revista académica Autor Guillermo Trincado Autor Cristián Leal D Fecha 00/2006 Catálogo de biblioteca SciELO URL http://www.scielo.cl/scielo.php?script=sci_abstract&pid=S0717-92002006000100003&lng=es&nrm=iso&tlng=es Accedido 13-06-2024, 13:10:35 Adicional Publisher: Universidad Austral de Chile Volumen 27 Páginas 23-34 Publicación Bosque (Valdivia) DOI 10.4067/S0717-92002006000100003 Número 1 ISSN 0717-9200 Fecha de adición 13-06-2024, 13:10:35 Modificado 13-06-2024, 13:10:35 Notas:
Revisado por Rocío Reinoso
Adjuntos
Effects of multicollinearity and autocorrelation on the variable-exponent taper functions
Tipo de elemento Artículo de revista académica Autor A Kozak Fecha 1997-05 Catálogo de biblioteca cdnsciencepub.com (Atypon) URL https://cdnsciencepub.com/doi/abs/10.1139/x97-011 Accedido 12-06-2024, 13:24:25 Adicional Publisher: NRC Research Press Volumen 27 Páginas 619-629 Publicación Canadian Journal of Forest Research DOI 10.1139/x97-011 Número 5 Abrev. de revista Can. J. For. Res. ISSN 0045-5067 Fecha de adición 12-06-2024, 13:24:25 Modificado 12-06-2024, 13:24:25 Adjuntos
Validación de un modelo fustal para Pino insigne
Tipo de elemento Artículo de revista académica Autor Fernando Cox Fecha 1985 Publicación Facultad de Ciencias Agrarias y Forestales Fecha de adición 23-09-2024, 12:17:15 Modificado 23-09-2024, 12:22:30 Notas:
Revisado por Victor Pacheco
Adjuntos
A New Stem Taper Function for Short-rotation poplar
Tipo de elemento Artículo de revista académica Autor Mohammed Benbrahim Autor André Gavaland Fecha 01/2003 Idioma en Catálogo de biblioteca DOI.org (Crossref) URL https://www.tandfonline.com/doi/full/10.1080/02827580310005171 Accedido 01-10-2024, 17:09:31 Volumen 18 Páginas 377-383 Publicación Scandinavian Journal of Forest Research DOI 10.1080/02827580310005171 Número 4 Abrev. de revista Scandinavian Journal of Forest Research ISSN 0282-7581, 1651-1891 Fecha de adición 01-10-2024, 17:09:31 Modificado 08-01-2025, 10:25:51 Notas:
[TLDR] A new stem taper function was established for individual trees of two poplar hybrid clones grown on a short-rotation coppice and allows the optimal length of billets to be determined and thus maximizes the merchantable biomass of poplar in short- rotations by minimizing the biomass of residues.
Adjuntos
Stem taper equations for poplars growing on farmland in Sweden
Tipo de elemento Artículo de revista académica Autor Birger Hjelm Fecha 3/2013 Idioma en Catálogo de biblioteca DOI.org (Crossref) URL http://link.springer.com/10.1007/s11676-012-0270-4 Accedido 01-10-2024, 17:08:20 Derechos http://www.springer.com/tdm Volumen 24 Páginas 15-22 Publicación Journal of Forestry Research DOI 10.1007/s11676-012-0270-4 Número 1 Abrev. de revista Journal of Forestry Research ISSN 1007-662X, 1993-0607 Fecha de adición 01-10-2024, 17:08:20 Modificado 01-10-2024, 17:08:20 Notas:
Revisado por Nicolás Campos
Adjuntos
Modeling Tree Crown Ratio
Tipo de elemento Artículo de revista académica Autor Margaret R. Holdaway Resumen 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. Fecha 1986-10 Catálogo de biblioteca pubs.cif-ifc.org (Atypon) URL https://pubs.cif-ifc.org/doi/10.5558/tfc62451-5 Accedido 04-11-2024, 11:50:05 Adicional Publisher: Canadian Institute of Forestry Volumen 62 Páginas 451-455 Publicación The Forestry Chronicle DOI 10.5558/tfc62451-5 Número 5 ISSN 0015-7546 Fecha de adición 04-11-2024, 11:50:05 Modificado 04-11-2024, 11:50:05 Notas:
Revisado por Nicolás Clavero
Adjuntos
Estimating stump volume, stump inside bark diameter and diameter at breast height from stump measurements
Tipo de elemento Artículo de revista académica Autor Antal Kozak Autor Stephen A. Y. Omule Resumen 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. Fecha 1992-10-01 Idioma en Catálogo de biblioteca DOI.org (Crossref) URL http://pubs.cif-ifc.org/doi/10.5558/tfc68623-5 Accedido 30-10-2024, 10:05:21 Volumen 68 Páginas 623-627 Publicación The Forestry Chronicle DOI 10.5558/tfc68623-5 Número 5 Abrev. de revista The Forestry Chronicle ISSN 0015-7546, 1499-9315 Fecha de adición 30-10-2024, 10:05:21 Modificado 30-10-2024, 10:05:21 Notas:
Revisado por Marcos Marivil
Adjuntos
A Cruising Computer for Variable Plots, Tree Heights, and Slope Correction
Tipo de elemento Artículo de revista académica Autor Albert R. Stage Fecha 1959-11-01 Catálogo de biblioteca Silverchair URL https://doi.org/10.1093/jof/57.11.835 Accedido 26-11-2024, 21:14:08 Volumen 57 Páginas 835-836 Publicación Journal of Forestry DOI 10.1093/jof/57.11.835 Número 11 Abrev. de revista Journal of Forestry ISSN 0022-1201 Fecha de adición 26-11-2024, 21:14:08 Modificado 26-11-2024, 21:14:08 Notas:
Revisado por Christian Salas
Adjuntos
Developing fully compatible taper and volume equations for all stem components of Eucalyptus globoidea Blakely trees in New Zealand
Tipo de elemento Artículo de revista académica Autor Daniel Boczniewicz Autor Euan G. Mason Autor Justin A. Morgenroth Resumen 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. Fecha 2022-03-21 Catálogo de biblioteca DOI.org (Crossref) URL https://nzjforestryscience.nz/index.php/nzjfs/article/view/180 Accedido 27-11-2024, 12:35:32 Derechos http://creativecommons.org/licenses/by/4.0 Volumen 52 Publicación New Zealand Journal of Forestry Science DOI 10.33494/nzjfs522022x180x Abrev. de revista NZJFS ISSN 1179-5395 Fecha de adición 27-11-2024, 12:35:32 Modificado 27-11-2024, 12:35:32 Notas:
Revisado por Natalia Pizarro
Adjuntos
Using terrestrial laser scanning data to estimate large tropical trees biomass and calibrate allometric models: A comparison with traditional destructive approach
Tipo de elemento Artículo de revista académica Autor Stéphane Momo Takoudjou Autor Pierre Ploton Autor Bonaventure Sonké Autor Jan Hackenberg Autor Sébastien Griffon Autor Francois De Coligny Autor Narcisse Guy Kamdem Autor Moses Libalah Autor Gislain Ii Mofack Autor Gilles Le Moguédec Autor Raphaël Pélissier Autor Nicolas Barbier Editor Sean McMahon Fecha 04/2018 Idioma en Título corto Using terrestrial laser scanning data to estimate large tropical trees biomass and calibrate allometric models Catálogo de biblioteca DOI.org (Crossref) URL https://besjournals.onlinelibrary.wiley.com/doi/10.1111/2041-210X.12933 Accedido 05-05-2025, 10:21:32 Derechos http://onlinelibrary.wiley.com/termsAndConditions#vor Volumen 9 Páginas 905-916 Publicación Methods in Ecology and Evolution DOI 10.1111/2041-210X.12933 Número 4 Abrev. de revista Methods Ecol Evol ISSN 2041-210X, 2041-210X Fecha de adición 05-05-2025, 10:21:32 Modificado 05-06-2025, 15:52:23 Notas:
Revisado por Marcos Marivil
Adjuntos
A Bayesian model to estimate land surface phenology parameters with harmonized Landsat 8 and Sentinel-2 images
Tipo de elemento Artículo de revista académica Autor Chad Babcock Autor Andrew O. Finley Autor Nathaniel Looker Fecha 08/2021 Idioma en Catálogo de biblioteca DOI.org (Crossref) URL https://linkinghub.elsevier.com/retrieve/pii/S0034425721001899 Accedido 02-06-2025, 12:23:39 Volumen 261 Páginas 112471 Publicación Remote Sensing of Environment DOI 10.1016/j.rse.2021.112471 Abrev. de revista Remote Sensing of Environment ISSN 00344257 Fecha de adición 02-06-2025, 12:23:39 Modificado 02-06-2025, 12:23:39 Notas:
Revisado por Denis Valle
Adjuntos
Comparing strategies for modeling individual-tree height and height-to-crown base increment in mixed-species Acadian forests of northeastern North America
Tipo de elemento Artículo de revista académica Autor Matthew B. Russell Autor Aaron R. Weiskittel Autor John A. Kershaw Fecha 11/2014 Idioma en Catálogo de biblioteca DOI.org (Crossref) URL http://link.springer.com/10.1007/s10342-014-0827-1 Accedido 24-05-2025, 20:04:32 Volumen 133 Páginas 1121-1135 Publicación European Journal of Forest Research DOI 10.1007/s10342-014-0827-1 Número 6 Abrev. de revista Eur J Forest Res ISSN 1612-4669, 1612-4677 Fecha de adición 24-05-2025, 20:04:32 Modificado 24-05-2025, 20:04:32 Notas:
Revisado por Nicolás Clavero
Adjuntos
Regional Stem Taper Equations for Eleven Conifer Species in the Acadian Region of North America: Development and Assessment
Tipo de elemento Artículo de revista académica Autor Rongxia Li Autor Aaron Weiskittel Autor Adam R. Dick Autor John A. Kershaw Autor Robert S. Seymour Fecha 2012-03-01 Idioma en Título corto Regional Stem Taper Equations for Eleven Conifer Species in the Acadian Region of North America Catálogo de biblioteca DOI.org (Crossref) URL https://academic.oup.com/njaf/article/29/1/5-14/4774246 Accedido 10-05-2025, 10:22:59 Volumen 29 Páginas 5-14 Publicación Northern Journal of Applied Forestry DOI 10.5849/njaf.10-037 Número 1 Abrev. de revista Northern Journal of Applied Forestry ISSN 07426348 Fecha de adición 10-05-2025, 10:22:59 Modificado 10-05-2025, 10:22:59 Notas:
Revisado por Nicolás Campos
Adjuntos
Local uncertainty maps for land-use/land-cover classification without remote sensing and modeling work using a class-conditional conformal approach
Tipo de elemento Artículo de revista académica Autor Denis Valle Autor Rodrigo Leite Autor Rafael Izbicki Autor Carlos Silva Autor Leo Haneda Resumen 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. Fecha 2024-12-01 Catálogo de biblioteca ScienceDirect URL https://www.sciencedirect.com/science/article/pii/S1569843224006447 Accedido 30-04-2025, 12:24:15 Volumen 135 Páginas 104288 Publicación International Journal of Applied Earth Observation and Geoinformation DOI 10.1016/j.jag.2024.104288 Abrev. de revista International Journal of Applied Earth Observation and Geoinformation ISSN 1569-8432 Fecha de adición 30-04-2025, 12:24:15 Modificado 30-04-2025, 12:24:15 Etiquetas:
Notas:
Revisado por Denis Valle
Adjuntos
Allometric scaling of plant energetics and population density
Tipo de elemento Artículo de revista académica Autor Brian J. Enquist Autor James H. Brown Autor Geoffrey B. West Resumen 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. Fecha 1998-09 Idioma en Catálogo de biblioteca www.nature.com URL https://www.nature.com/articles/25977 Accedido 30-04-2025, 12:19:51 Derechos 1998 Macmillan Magazines Ltd. Adicional Publisher: Nature Publishing Group Volumen 395 Páginas 163-165 Publicación Nature DOI 10.1038/25977 Número 6698 ISSN 1476-4687 Fecha de adición 30-04-2025, 12:19:51 Modificado 30-04-2025, 12:19:51 Etiquetas:
Notas:
Revisado por Christian Salas
Adjuntos
Spatial validation reveals poor predictive performance of large-scale ecological mapping models
Tipo de elemento Artículo de revista académica Autor Pierre Ploton Autor Frédéric Mortier Autor Maxime Réjou-Méchain Autor Nicolas Barbier Autor Nicolas Picard Autor Vivien Rossi Autor Carsten Dormann Autor Guillaume Cornu Autor Gaëlle Viennois Autor Nicolas Bayol Autor Alexei Lyapustin Autor Sylvie Gourlet-Fleury Autor Raphaël Pélissier Resumen 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. Fecha 2020-09-11 Idioma en Catálogo de biblioteca DOI.org (Crossref) URL https://www.nature.com/articles/s41467-020-18321-y Accedido 02-04-2025, 11:38:48 Volumen 11 Páginas 4540 Publicación Nature Communications DOI 10.1038/s41467-020-18321-y Número 1 Abrev. de revista Nat Commun ISSN 2041-1723 Fecha de adición 02-04-2025, 11:38:48 Modificado 02-04-2025, 11:38:48 Notas:
Revisado por Denis Valle
Adjuntos
A new method for capturing stem taper variation for trees of diverse morphological types
Tipo de elemento Artículo de revista académica Autor David W. MacFarlane Autor Aaron R. Weiskittel Resumen 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. Fecha 06/2016 Idioma en Catálogo de biblioteca DOI.org (Crossref) URL http://www.nrcresearchpress.com/doi/10.1139/cjfr-2016-0018 Accedido 08-06-2025, 18:42:02 Derechos http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Volumen 46 Páginas 804-815 Publicación Canadian Journal of Forest Research DOI 10.1139/cjfr-2016-0018 Número 6 Abrev. de revista Can. J. For. Res. ISSN 0045-5067, 1208-6037 Fecha de adición 08-06-2025, 18:42:02 Modificado 08-06-2025, 18:42:02 Notas:
Revisado por Victor Pacheco
Adjuntos