过伐林区检查法经营针阔混交林林分结构动态

为使过伐林保持好的林分结构 ,并使森林生态系统在经营情况下正向演替 ,从而产生较高的效益 ,该文作者以金沟岭林场的云冷杉针阔混交林为研究对象 ,分析了该林场始于 1 987年的检查法经营下连续 1 4年的森林资源调查数据 .利用Weibull分布和负指数分布拟合该类型林分的直径结构 ,并计算了该森林类型的q值 ,分析了连续1 4年来检查法经营针阔混交林林分的蓄积结构 .研究结果表明 :①Weibull分布与负指数分布均能较好描述过伐林区针阔混交林的直径结构 ;②该森林类型直径的q值 ,分布范围在 1 2 0～ 1 5 0之间 ,平均值为 1 30 ;③经过 1 4年的检查法经营 ,小径级、中径级林木的蓄积比重总趋势在下降 ,大径级林木的比重在上升 ,蓄积结构比实验前更加合理

Forest structure dynamics of coniferous-broad leaved mixed forests by management of control method in over-logged forest region

How to manage the over_logged natural forest to keep its perfect forest structure and to bring good benefit is one of the keys to ensure the over_logged natural forest ecosystem succession ahead. This paper studied the spruce_fir mixed stands by control method in Jingouling Forest Farm in northeastern China's Jilin Province and analysed the successive investigation data of forest resources since 1987 The study used the Weibull distribution and negative index distribution to describe the diameter structure of over_logged natural forest and to calculates its q value. This paper also analysed the volume structure of over_logged natural forest by control method in the recent ten years.The research results show that: ①Weibull distribution and negative index distribution can be applied to describe the diameter structure of the coniferous_broad leaved mixed stands; ②The distribution of q value is between 1 2～1 5, and the numerical average value is 1 30; ③Under the test of control method management in the past ten years, the volume proportion of the small to middle diameter trees is descending and the volume proportion of the big diameter trees is ascending, the volume proportion of these three kinds of trees becomes better compared with before.