可变参数相对树高曲线模型及其应用研究

VARIABLE RELATIVE TREE HEIGHT CURVE MODEL AND ITS APPLICATION IN TREE VOLUME ESTIMATION

用我国现行一元立木材积表估计林分或样地的立木材积偏差很大，而直接利用二元立木材积表，则野外实测树高的工作量又太大。本研究针对这一实际问题，提出了通过建立可变参数相对树高曲线模型，将二元立木材积表直接用于林分或样地立木材积估计的方法，其估计精度可达到接近实测树高曲线法的水平。研究提出的可变参数相对树高曲线模型结构通式为：ＲＨｉ＝。

Tree volume estimate of forest stand or sample plot by using the current one -way tree volume tableis significantly biased, and on the other hand, the workload for measuring heights of sample trees in field is rather heavy if two -way tree volume tableis directly used. To Dealing with counter this problem existed in practice, a new approach is presented in this paper that two -way tree volume table can be employed directly to estimate the volume of forest stand or sample plot based on the establishment of a variable relative height curve model. By using this ap- proach, the precision of volume estimate is almost as high as that by using tree height curve, but in this case, it is not necessary to measure heights of sample trees, so the workload in field is reduced evidently. The general form of variablerelative tree height curve model presented in this paper. is:RHi