基于综合采伐指数的帽儿山阔叶混交林结构优化模拟

数据来源于帽儿山4块阔叶混交林固定样地(面积30 m×30 m),以混交度、大小比、角尺度等8个指标作为林分空间结构参数,构建综合采伐指数Fi。对以下不同采伐强度0(对照)、10%、20%、30%的林分进行模拟采伐,对比筛选出各样地最适宜的采伐强度。研究结果表明:(1)林木综合采伐指数的构建综合考虑了各林分空间结构指标,在抚育采伐中,可以科学合理的确定采伐木;(2)阔叶混交林林木各空间结构指标对综合采伐指数影响的程度由大到小为:林木竞争指数、角尺度、开敞度、大小比数、健康指数、目的树种特性、混交度、空间密度指数;(3)通过对比分析不同采伐强度下林分非空间和空间结构的变化情况,发现株数采伐强度在20%~30%时,有效的改善了林分结构,提升了林木生长发育空间。

Simulation of Mixed Forest Structure Optimization with Comprehensive Cutting Index in Maoer Mountain

With the data of four fixed sample plots in broadleaved mixed forest in Mao'er Mountain Forest Farm,we used eight structural parameters to build the cutting index Fi.Selective cutting operation was adopted with different intensities of cut-ting(no cutting,10%,20%and 30%)to examine the influence of cutting on spatial structure and non spatial structure of the stands.The optimum cutting intensity of each stand was screened out.The main results:(1)It was scientific and rea-sonable to determine that whether a tree should be cut or not by taking into account of mingling intensity,and neighborhood comparison.(2)The descending order of importance of the eight indexes for a hard broad leaf mixed forest was CIi, |Wi-0.5|,Bi,Ui,Hi,Ai,Mi,and Di.(3)Through comparative analysis,the change of stand non-spatial and spatial struc-ture under a given intensity, the cutting intensity of 20%-30%might enhance the stability of forest community spatial structure effectively and its communities spatial structure was superior.