长白山云冷杉原始林径阶多样性及空间结构分析

利用径阶多样性指数,配合混交度、大小比、角尺度3空间结构参数分析了长白山云冷杉原始林的结构特征.结果表明:在调查的25年间,林分径阶多样性总体变化不大,但在小范围内有先增大再减小的趋势.对目前林分空间结构的研究看出,林分平均混交度为0.82,林分种间隔离程度较大,林分处于稳定水平:林分胸径大小比数和树高大小比数分别为0.50和0.46,总体优势度有继续上升的潜力；林分平均角尺度为0.514,呈随机分布状态.

Diameter Class Diversity and Spatial Structure of Primary Spruce-fir Forest in the Changbai Mountains

The primary spruce-fir forest in the Changbai Mountains was studied on its diameter class diversity indices with the three spatial structure indexes of mingling,neighborhood comparison and neighborhood pattern.The results showed that diameter class diversity changed little in the 25 years of investigation,but it increased first and tended to decrease later in small scale.The study for the present stand spatial structure showed that the average mingling in the stand was 0.82,showing that the stand had a larger mixed degree,and the stand was at a stable level.The values of neighborhood comparison of diameter at breast heigh and tree height of the stand was 0.50 and 0.46 respectively,the overall dominance had the potential to continue to rise.The average value of neighborhood pattern of the stand was 0.514,showing a random distribution.