Species-specific and general allometric equations for estimating tree biomass components of subtropical forests in southern China

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• 作者：Wenhua Xiang ; Jing Zhou ; Shuai Ouyang ; Shengli Zhang…
• 关键词：Carbon stock ; Coarse root biomass ; Coniferous species ; Deciduous broadleaved species ; Evergreen broadleaved species ; Seemingly unrelated regression
• 刊名：European Journal of Forest Research
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：135
• 期：5
• 页码：963-979
• 全文大小：2,846 KB
• 刊物主题：Forestry; Plant Sciences; Plant Ecology;
• 出版者：Springer Berlin Heidelberg
• ISSN：1612-4677
• 卷排序：135

文摘

Chinese subtropical forests contain a diversity of tree species and exhibit a high carbon (C) sequestration capacity, but biomass and C stock assessments in subtropical secondary forests remain uncertain because of a limited availability of allometric equations and an uncertain applicability of existing allometric equations that have not been tested for these forests. We developed allometric equations for important coniferous (Pinus massoniana), deciduous broadleaved (Alniphyllum fortunei, Choerospondias axillaris, Liquidambar formosana) and evergreen broadleaved (Cyclobalanopsis glauca, Litsea rotundifolia, Schima superba) species. A total of 70 trees (10 trees for each species) with diameters at breast height (D) ranging from 2.6 to 50.9 cm were destructively harvested and dissected into tree components (stem, branch, leaf and coarse root). Species-specific equations using D alone as the predictor variable fitted the data well (p < 0.0053 and R2 > 0.72) for each tree component. Including height (H) in the form of D2H only improved the regression fit for A. fortunei and L. rotundifolia. The relationships of branch, leaf and root biomass against D varied among tree species. General equations for functional groups and all species combined showed comparable bias for stem, aboveground and total tree biomass to species-specific equations. We recommend the general equations of multiple species to estimate forest biomass at regional scales and also to estimate stem, aboveground and total tree biomass for each species when species-specific allometric equations are not available at a given site. For branch, leaf and root biomass, species-specific equations are preferred, even though this requires biomass data for additional tree species.