华北落叶松林角尺度研究  

Study on Uniform Angle Index of Larix principis Plantation

作　　者：陈凤娟[1] 谷建才[1] 黄冬梅[1] 刘涛[1] 陈凤艳[1] 

机构地区：[1]河北农业大学,河北保定071001

出　　处：《林业资源管理》2009年第3期38-41,共4页Forest Resources Management

基　　金：落叶松人工林高效经营技术普及(20060612142)

摘　　要：根据承德塞罕坝机械林场各个分场华北落叶松林分内林木的角尺度研究,对林分设置4个间伐强度处理,其密度分别为225株/hm2,600株/hm2,900株/hm2,1350株/hm2。结果表明,在极强度间伐区(A)、强度间伐区(B)和中度间伐区(C)中林分内的林木分布在角尺度为0.25的频率较高,角尺度均值都小于0.475,林分呈均匀分布。弱度间伐区(D)和对照区(E)的角尺度为0.75,所占的比例较大,角尺度均值分别为0.477和0.5,林分呈随机分布。针阔混交林和针叶混交林分内的角尺度均值分别为0.3929和0.25,林木分布较均匀。The authors studied the influence of a thinning intensity on uniform angle index in Larix principis Plantation in Saihanba mechanical forest farm of Chengde. The four different treatments of thinning intensities are 225 trees/hm^2 ,600 trees/hm^2 ,900 trees/hm^2 and 1350 trees/hm^2 respectively. The higher frequency distribution of uniform angle index was 0.25 in very heavy thinning group（A）, heavy thinning group（B） and mid - thinning intensity group （C）. Their average uniform angle index was less than 0.475. The result showed that they were equality distribution in the three different treatments of thinning intensities of Larix principis Plantation. The higher frequency distribution of uniform angle index was 0.75 in light thinning group（D） and control area（E） and their average uniform angle index was 0. 477 and 0.5. The result showed that the forest trees were in random distribution in light thinning group （D） and control area （E）. The average uniform angle indexes were 0.3929 and 0.25 in mixed wood and coniferous mixed forest. It showed that forest trees were distributed uniformly in mixed forests.

关 键 词：间伐 华北落叶松 角尺度 

分 类 号：S758[农业科学—森林经理学]