Individual-Tree Diameter Growth Models for Mixed Nothofagus Second Growth forests in Southern Chile

Paulo C Moreno, Sebastian Palmas, Francisco Javier Escobedo, Wendell P Cropper, Salvador A Gezan

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Second growth forests of Nothofagus obliqua (roble), N. alpina (raulí), and N. dombeyi (coihue), known locally as RORACO, are among the most important native mixed forests in Chile. To improve the sustainable management of these forests, managers need adequate information and models regarding not only existing forest conditions, but their future states with varying alternative silvicultural activities. In this study, an individual-tree diameter growth model was developed for the full geographical distribution of the RORACO forest type. This was achieved by fitting a complete model by comparing two variable selection procedures: cross-validation (CV), and least absolute shrinkage and selection operator (LASSO) regression. A small set of predictors successfully explained a large portion of the annual increment in diameter at breast height (DBH) growth, particularly variables associated with competition at both the tree- and stand-level. Goodness-of-fit statistics for this final model showed an empirical coefficient of correlation (R2emp) of 0.56, relative root mean square error of 44.49% and relative bias of −1.96% for annual DBH growth predictions, and R2emp of 0.98 and 0.97 for DBH projection at 6 and 12 years, respectively. This model constitutes a simple and useful tool to support management plans for these forest ecosystems.
Original languageEnglish (US)
Article number506
JournalForests
Volume8
Issue number12
StatePublished - Dec 19 2017

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Nothofagus
tree and stand measurements
growth models
Chile
Nothofagus obliqua
Nothofagus dombeyi
sustainable forestry
mixed forests
shrinkage
forest types
forest ecosystems
geographical distribution
mixed forest
managers
statistics
forest ecosystem
prediction
second growth

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Moreno, P. C., Palmas, S., Escobedo, F. J., Cropper, W. P., & Gezan, S. A. (2017). Individual-Tree Diameter Growth Models for Mixed Nothofagus Second Growth forests in Southern Chile. Forests, 8(12), [506].
Moreno, Paulo C ; Palmas, Sebastian ; Escobedo, Francisco Javier ; Cropper, Wendell P ; Gezan, Salvador A. / Individual-Tree Diameter Growth Models for Mixed Nothofagus Second Growth forests in Southern Chile. In: Forests. 2017 ; Vol. 8, No. 12.
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abstract = "Second growth forests of Nothofagus obliqua (roble), N. alpina (raul{\'i}), and N. dombeyi (coihue), known locally as RORACO, are among the most important native mixed forests in Chile. To improve the sustainable management of these forests, managers need adequate information and models regarding not only existing forest conditions, but their future states with varying alternative silvicultural activities. In this study, an individual-tree diameter growth model was developed for the full geographical distribution of the RORACO forest type. This was achieved by fitting a complete model by comparing two variable selection procedures: cross-validation (CV), and least absolute shrinkage and selection operator (LASSO) regression. A small set of predictors successfully explained a large portion of the annual increment in diameter at breast height (DBH) growth, particularly variables associated with competition at both the tree- and stand-level. Goodness-of-fit statistics for this final model showed an empirical coefficient of correlation (R2emp) of 0.56, relative root mean square error of 44.49{\%} and relative bias of −1.96{\%} for annual DBH growth predictions, and R2emp of 0.98 and 0.97 for DBH projection at 6 and 12 years, respectively. This model constitutes a simple and useful tool to support management plans for these forest ecosystems.",
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Individual-Tree Diameter Growth Models for Mixed Nothofagus Second Growth forests in Southern Chile. / Moreno, Paulo C ; Palmas, Sebastian; Escobedo, Francisco Javier; Cropper, Wendell P; Gezan, Salvador A.

In: Forests, Vol. 8, No. 12, 506, 19.12.2017.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Individual-Tree Diameter Growth Models for Mixed Nothofagus Second Growth forests in Southern Chile

AU - Moreno, Paulo C

AU - Palmas, Sebastian

AU - Escobedo, Francisco Javier

AU - Cropper, Wendell P

AU - Gezan, Salvador A

PY - 2017/12/19

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AB - Second growth forests of Nothofagus obliqua (roble), N. alpina (raulí), and N. dombeyi (coihue), known locally as RORACO, are among the most important native mixed forests in Chile. To improve the sustainable management of these forests, managers need adequate information and models regarding not only existing forest conditions, but their future states with varying alternative silvicultural activities. In this study, an individual-tree diameter growth model was developed for the full geographical distribution of the RORACO forest type. This was achieved by fitting a complete model by comparing two variable selection procedures: cross-validation (CV), and least absolute shrinkage and selection operator (LASSO) regression. A small set of predictors successfully explained a large portion of the annual increment in diameter at breast height (DBH) growth, particularly variables associated with competition at both the tree- and stand-level. Goodness-of-fit statistics for this final model showed an empirical coefficient of correlation (R2emp) of 0.56, relative root mean square error of 44.49% and relative bias of −1.96% for annual DBH growth predictions, and R2emp of 0.98 and 0.97 for DBH projection at 6 and 12 years, respectively. This model constitutes a simple and useful tool to support management plans for these forest ecosystems.

M3 - Article

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