摘要
利用换算因子连续函数法构建了林分蓄积量与生物量的转换模型.首次提出了木材气干密度与全干密度的不同及对碳密度求算的影响,并给出了修正系数.由木材的化学物质构成比例和分子量导出了由林分生物量估算林分碳贮量的实用模型,从而实现了在林分尺度上由二类调查的小班每公顷蓄积量到小班碳贮量的转换.利用该模型计算得到研究地区的有林地平均碳密度1994年为85.06 t/hm2,2002年为88.13 t/hm2,将其间因抚育采伐损失的碳贮量158 785 t计入其中,则碳密度的增长量为1.10 t/(hm2.a).利用GIS对1994年和2002年的碳密度的分布进行了表示和叠加,结果显示碳密度增加的面积略大于减少的面积,森林抚育采伐和非法采伐是碳密度减少的主要原因.
Utilizing variable BEF （biomass expansion factor） method, a switch model between stand volume and forest biomass was established. In this paper, the difference between wood air-dry density and over-dry one was presented firstly and its influence on carbon density calculation was analyzed, moreover the correct coefficient was obtained. Utility model was used to calculate the stand carbon storage by forest biomass, which making the sub-compartment stand volume＇s transformation to carbon storage come true based on the forest resource programming and investigating and it was educed by the differences of chemistry element proportion and the molecular weight of wood. Utilizing the model, the authors obtained the average carbon density of stand in the study region, which was 85.06 and 88.13 t/hm^2 in 1994 and 2002 respectively. Including the losing carbon storage of 158 785 t between years of 1994 and 2002, resulted from forest accretion cutting,the total increase of carbon density was 1.10 t/（hm^2·a）. Using GIS software, the distribution of carbon density in 1994 and 2002 was explored and superposed. The results show that the area of carbon density increased is a little more than that of carbon density reduced. The important reasons for carbon density reduction are forest tending and illegal cutting.
出处
《北京林业大学学报》
EI
CAS
CSCD
北大核心
2007年第4期166-169,共4页
Journal of Beijing Forestry University
基金
吉林省林业厅基金资助项目(吉科合字200609)
关键词
碳贮量
林分
木材密度
GIS
carbon storage, stand, wood density, GIS
