青椆混交林间伐指数初探

提出"间伐指数"这一新概念来量化林木在抚育间伐中被确定为间伐木的概率,突破了传统方法中对间伐木确定笼统定性的局限。选取林木的自由度、混交度、大小比数、健康指数、空间密度指数和目的树种特性指数等6个指标,结合对象林分的经营类型,并运用层次分析法给各指标赋权重,可得出该林分林木间伐指数的计算模型。以湖南省沅江市龙虎山林场青椆混交林的一个试验样地为案例,采用"间伐指数"来确定间伐木,得到了较为理想的抚育间伐方案。

Preliminary Study on Intermediate Cutting Index of Cyclobalanopsis myrsinaefolia Mixed Stand

The concept of intermediate cutting index which precisely quantifies the probability of a tree being intended to be cut in intermediate cutting has been put forward in this paper.This breaks through the limit that trees are intended to be cut by traditional general qualitative methods.Six indexes(degree of freedom,mingling,neighborhood comparison,health index,spatial density and aim index)are chosen to construct intermediate cutting index,then AHP is used to get weight coefficients of the six indexes combined with types of the objective stands,so the formula can be obtained.one experiment sample plot of Cyclobalanopsis myrsinaefolia mixed stand in Longhushan forest farm in Hunan,Yuanjiang has been taken as an example,a fairly good tending and thinning plan has been obtained by calculating intermediate cutting indexes.