Allometric equations for estimating tree aboveground biomass in tropical dipterocarp forests of Vietnam
There
are few allometric equations available for dipterocarp forests, despite
the fact that this forest type covers extensive areas in tropical
Southeast Asia. This study aims to develop a set of equations to
estimate tree aboveground biomass (AGB) in dipterocarp forests in
Vietnam and to validate and compare their predictive performance with
allometric equations used for dipterocarps in Indonesia and pantropical
areas. Diameter at breast height (DBH), total tree height (H), and wood
density (WD) were used as input variables of the nonlinear weighted
least square models. Akaike information criterion (AIC) and residual
plots were used to select the best models; while percent bias, root mean
square percentage error, and mean absolute percent error were used to
compare their performance to published models. For mixed-species, the
best equation was AGB = 0.06203 × DBH2.26430 ×H0.51415 ×WD0.79456. When
applied to a random independent validation dataset, the predicted values
from the generic equations and the dipterocarp equations in Indonesia
overestimated the AGB for different sites, indicating the need for
region-specific equations. At the genus level, the selected equations
were AGB = 0.03713 × DBH2.73813 and AGB = 0.07483 × DBH2.54496 for two
genera, Dipterocarpus and Shorea, respectively, in Vietnam. Compared to
the mixed-species equations, the genus-specific equations improved the
accuracy of the AGB estimates. Additionally, the genus-specific
equations showed no significant differences in predictive performance in
different regions (e.g., Indonesia, Vietnam) of Southeast Asia.
Title:
Title:
Allometric equations for estimating tree aboveground biomass in tropical dipterocarp forests of Vietnam | |
Authors: | Huy, B. Poudel, K.P. Kralicek, K., (...) Phuong, V.T. Temesgen, H. |
Keywords: | Aboveground biomass Allometric equation Dipterocarp forest Genus Southeast Asia |
Issue Date: | 2016 |
Publisher: | MDPI AG |
Citation: | Scopus |
Abstract: | There are few allometric equations available for dipterocarp forests, despite the fact that this forest type covers extensive areas in tropical Southeast Asia. This study aims to develop a set of equations to estimate tree aboveground biomass (AGB) in dipterocarp forests in Vietnam and to validate and compare their predictive performance with allometric equations used for dipterocarps in Indonesia and pantropical areas. Diameter at breast height (DBH), total tree height (H), and wood density (WD) were used as input variables of the nonlinear weighted least square models. Akaike information criterion (AIC) and residual plots were used to select the best models; while percent bias, root mean square percentage error, and mean absolute percent error were used to compare their performance to published models. For mixed-species, the best equation was AGB = 0.06203 × DBH2.26430 ×H0.51415 ×WD0.79456. When applied to a random independent validation dataset, the predicted values from the generic equations and the dipterocarp equations in Indonesia overestimated the AGB for different sites, indicating the need for region-specific equations. At the genus level, the selected equations were AGB = 0.03713 × DBH2.73813 and AGB = 0.07483 × DBH2.54496 for two genera, Dipterocarpus and Shorea, respectively, in Vietnam. Compared to the mixed-species equations, the genus-specific equations improved the accuracy of the AGB estimates. Additionally, the genus-specific equations showed no significant differences in predictive performance in different regions (e.g., Indonesia, Vietnam) of Southeast Asia. |
Description: | Forests Volume 7, Issue 8, 22 August 2016, Pages 1-19 |
URI: | http://repository.vnu.edu.vn/handle/VNU_123/29561 http://www.mdpi.com/1999-4907/7/8/180 |
ISSN: | 19994907 |
Appears in Collections: | Bài báo của ĐHQGHN trong Scopus |
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