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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。
According to the angle scale study of trees in Larix principis-rupprechtii stand at Saikandan mechanical forest farm in Chengde, four thinning intensity treatments were set for the stands, the densities were 225 plants / hm2, 600 plants / hm2, 900 plants / hm2, 1350 plants / hm2. The results showed that the distribution of tree species in the stands of extremely intensive thinning area (A), intensive thinning area (B) and intermediate thinning area (C) was higher at a scale of 0.25 and the mean of scale was less than 0.475 , The forest was evenly distributed. The angle scale of weakness thinning zone (D) and control zone (E) is 0.75, which accounts for a large proportion, and the average of scale scales is 0.477 and 0.5 respectively. The stands are randomly distributed. Coniferous and broad-leaved mixed forest and coniferous mixed forest, respectively, the average angular scale were 0.3929 and 0.25, forest distribution more evenly.