Abstract:

Based on mensuration data of individual tree diameter and height from 20 larch plots in Wangqing Forest Bureau of Jilin province,height-diameter regression models on population level and stand level were developed,and impact of different methods to forest volume estimation was analyzed.The results showed that for estimation of total volume the errors of four methods were less than ±0.3%,and for estimation of stand volume the error of stand model method was minimum and less than ±0.3%,the error of population model method was maximum but less than ±7%,and the errors of adjusted model method and relative model method were small and less than ±2%.Like the relative model method,the adjusted model methodpresented in this paper is a recommended practical approach for forest volume estimation based on two-variable tree volume model.

Key words: height-diameter model, relative tree height curve, Richards function, population level model, stand level model