Integrated individual tree biomass simultaneous equations for two larch species in northeastern and northern China
Integrated individual tree biomass simultaneous equations for two larch species in northeastern and northern China
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DOI：
10.1080/02827581.2015.1046481
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发表时间：
2015-04
影响因子：
1.8
通讯作者：
W. Zeng
中科院分区：
文献类型：
--
作者：
W. Zeng
在全球气候变化的背景下，大尺度森林生物量估算已成为一个重要的研究课题，而建立适用于大尺度估算的单木生物量方程是一项基础性工作。根据对兴安落叶松和落叶松100株样木的生物量组成和蓄积量的测定数据，分析了兴安落叶松和落叶松的生物量组成和蓄积量。华北华北在该系统中，所有方程的参数同时进行估计，使地上生物量方程与树干体积方程和生物量转换因子（BCF）函数兼容，地下生物量方程与根冠比（RSR）函数兼容，茎材、茎皮、分支和叶生物量方程与地上生物量方程可加。此外，该系统还确保了单变量和双变量模型之间的兼容性。结果表明：（1）无论是地上生物量方程还是地下生物量方程和立木蓄积量方程，东北落叶松的估算值均大于北方落叶松：（2）落叶松的生物量系数随直径的增大而减小，而相对生物量系数随直径的增大而增大;（3）随着生长直径的增大，干材生物量占地上生物量的比例增大，而干皮、分支和叶生物量占地上生物量的比例减小。
Forest biomass estimation at large scale has become an important topic in the background of facing global climate change, and it is fundamental to develop individual tree biomass equations suitable for large-scale estimation. Based on the measured data of biomass components and stem volume from 100 sample trees of two larch species (Larix gmelinii and L. principis-rupprechtii) in northeastern and northern China, an integrated equation system including individual tree biomass equations, stem volume equation and height–diameter regression model were constructed using the dummy variable model and error-in-variable simultaneous equations. In the system, all the parameters of equations were estimated simultaneously, so that the aboveground biomass equation was compatible to stem volume equation and biomass conversion factor (BCF) function; the belowground biomass equation was compatible to root-to-shoot ratio (RSR) function; and stem wood, stem bark, branch and foliage biomass equations were additive to aboveground biomass equation. In addition, the system also ensured the compatibility between one- and two-variable models. The results showed that: (1) whether aboveground biomass equations or belowground biomass equations and stem volume equations, the estimates for larch in northeastern China were greater than those in northern China; (2) BCF of a larch tree decreased with the growing diameter while RSR increased with the growing diameter; (3) the proportion of stem wood biomass to aboveground biomass increased with the growing diameter while those of stem bark, branch, and foliage biomass decreased.