以吉林省汪清林业局金沟岭林场云冷杉过伐林112块固定样地1987—2003年间4次调查数据为依据,分析其株数径阶分布特点,并用Weibull分布和负指数分布描述其直径结构。研究表明:该林分直径结构为异龄林结构;Weibull分布函数和负指数分布函数均能表达云冷杉过伐林直径结构,Weibull分布函数拟合的效果比负指数分布好。

On the basis of the data from four investigations between 1987 to 2003 of overcut spruce-fir forest in Jingouling Forest Farm,Wangqing Forest Bureau,Jilin province.The author analyses the number distribution characteristic at different diameter grades,and describes the diameter structure with two kinds of functions of Weibull distribution and negative index distribution.The results show that the diameter distributions are complied to the uneven-aged stand.Both Weibull distribution and negative index distribution can be used to describe the stand diameter structure of overcut spruce-fir forest and the former is better than the latter.