摘要
采用传统标准地调查方法,取得数据,利用ForStat的统计分布假设检验对幼、中、近、熟4种林分径阶分布数据进行χ2检验。结果表明,Logistic分布假设检验对幼中近熟林的p值均大于0.05,适用于幼龄林、中龄林、近熟林和成熟林的径阶分布;幼龄林左尾林木株数大于右尾林木株数,中龄林、近熟林、成熟林右尾分布株数多于左尾分布株数;杉木直径Logistic分布的离散程度随林龄增加而增加,但林木直径分布成尖峰状态,杉木林分中林木比较集中在均值区域。
Aimed at studying the distribution of diameter grade in different age groups of Cunninghamia lanceolata, relative data of C. lanceolata were obtained by traditional methods of investigation. ForStat software was adopted to conduct χ^2 test of hypothesis testing on the distribution of diameter grade. The results indicated the p values of various age groups about hypothesis testing of Logistic distribution were all more than 0.05, applicable to the diameter grade distribution of four different stand age classes, young, middle-age, near-mature, and mature forest. In young growth, the left tail number of trees was higher than the right tail number of trees, however, in other age classes, the number of right tail was more than the left tail. Discrete degree of Logistic diameter distribution of increased with the increase of tree age, however, the diameter distribution was into the peak state, C. lanceolata stand were more concentrated in the mean value region.
出处
《西北林学院学报》
CSCD
北大核心
2015年第1期178-183,共6页
Journal of Northwest Forestry University
基金
中央高校基本科研业务费专项(YX2013-37)
中央高校基本科研业务费专项(TD2011-09)
关键词
不同龄组
直径分布
杉木林
拟合曲线
different age group
diameter distribution
Cunninghamia lanceolata forest
fitting curve
