择伐经营对不同坡向云冷杉天然林伐后空间结构的影响  

Effects of selective cutting on the spatial structure of natural Spruce-fir forest in different aspect after cutting

作　　者：周梦丽[1] 张青[1] 亢新刚[1] 杨英军[2] 王全军[2] 

机构地区：[1]北京林业大学,北京100083 [2]吉林省汪清林业局,吉林延吉133200

出　　处：《河南农业大学学报》2015年第6期769-776,共8页Journal of Henan Agricultural University

基　　金：国家林业局"948"项目(2013466)

摘　　要：以8块云冷杉天然林固定样地为研究对象,利用混交度、大小比数、角尺度、林层指数4个林分空间结构指标分析比较不同择伐强度(0%,20%,30%,40%)下不同坡向云冷杉天然林伐后空间结构的差异。结果表明,在不同择伐样地中,林地平均混交度与择伐强度呈负相关,且东北坡大于西南坡,东北坡向20%择伐样地的平均混交度(0.76)最大;各样地林木大小比数几乎不受择伐强度及坡向的影响;东北坡向20%的择伐样地水平空间成均匀分布,其余为随机分布;东北坡向20%的择伐样地林层指数最大,为0.37。因此,在东北坡进行20%的择伐作业有利于云冷杉天然林伐后空间结构优化。Selective cutting operation was carried out in eight fixed sample plots of natural spruce-fir forest with different cutting intensity（ 0%,20%,30%,40%） to analyze the difference in the spatial structure of natural Spruce-fir forest in different aspect after cutting through utilizing the four stand spatial structure indices,mingling degree,neighborhood comparison,uniform angle index and storey index. The results indicated that,in different spots,the mean of mingling degree was negatively correlated with the cutting intensity and the mean of mingling degree of northeast slope was higher than that of the southwest slope. Among them,the mean of mingling degree of the northeast slope with 20% cutting intensity,which is 0. 76,was the biggest. The selective cutting intensity and aspect had no great influence on the value of the neighborhood comparison of different plots. The species of the northeast slope with 20% cutting intensity were in uniform distribution and the others were random distribution. The value of storey index of the northeast slope with 20% cutting intensity,which is 0. 37,was the greatest. Thus,the selective cutting operation with 20% cutting intensity in the northeast slope is good for the spatial structure optimization of natural spruce-fir forest.

关 键 词：云冷杉天然林 择伐强度 空间结构 林层指数 

分 类 号：S752.2[农业科学—森林经理学]