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Forests 2016, 7(8), 180;

Allometric Equations for Estimating Tree Aboveground Biomass in Tropical Dipterocarp Forests of Vietnam

Department of Forest Resources and Environment Management, Tay Nguyen University, 567 Le Duan, Buon Ma Thuot, Dak Lak 630000, Vietnam
Department of Forest Engineering, Resources and Management, Oregon State University, Corvallis, OR 97333, USA
Forest Inventory and Planning Institute, Vinh Quynh, Thanh Tri, Ha Noi 100000, Vietnam
Vietnam National University of Forestry, Xuan Mai, Chuong My, Ha Noi 100000, Vietnam
Vietnamese Academy of Forest Sciences, Đuc Thang, Bac Tu Liem, Ha Noi 100000, Vietnam
Author to whom correspondence should be addressed.
Academic Editors: Shibu Jose and Timothy A. Martin
Received: 23 May 2016 / Revised: 15 August 2016 / Accepted: 16 August 2016 / Published: 22 August 2016
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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 × DBH 2.26430 × H 0.51415 × WD 0.79456 . 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 × DBH 2.73813 and AGB = 0.07483 × DBH 2.54496 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. View Full-Text
Keywords: aboveground biomass; allometric equation; dipterocarp forest; genus; Southeast Asia aboveground biomass; allometric equation; dipterocarp forest; genus; Southeast Asia

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Huy, B.; Poudel, K.P.; Kralicek, K.; Hung, N.D.; Khoa, P.V.; Phương, V.T.; Temesgen, H. Allometric Equations for Estimating Tree Aboveground Biomass in Tropical Dipterocarp Forests of Vietnam. Forests 2016, 7, 180.

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