摘要
本研究以孟滦林场柞树林分为研究对象,采用网格法对其进行调查研究,利用Weibull分布以及负指数分布对该类型的直径结构进行拟合,并通过角尺度、混交度、大小比3个参数,对林分空间结构特征进行了分析。结果表明:柞树林分直径结构呈单峰山状分布,表明直径结构分布较不合理;林分小径阶较多时,负指数分布比Weibull分布拟合效果略好;林分内林木的分布格局为团状分布,树种中度混交且林分中各林木生长优势度较为均衡。
In order to identify the stand structure,this study used the lattice method to investigate Quercus mongolica stand in the Mengluan forest farm.Stand diameter distribution was fitted using Weibull distribution and the negative exponential distribution,three parameters of angle index,mingling degree and the value of neighborhood comparison were used to analyze distribution pattern of stand.Results showed that the stand diameter distribution shows a unimodal hill-shape curve generally indicative of unreasonable diameter structure distribution.The fitting results of the stand diameter distribution appear slightly better with the negative exponential distribution than with Weibull distribution when stand contains more of the smaller diameter classes.The distribution pattern of the forest stand is clump distribution;the tree species composition is moderately mixed and the trees of forest stand grow more balanced.
出处
《河北农业大学学报》
CAS
CSCD
北大核心
2011年第2期34-39,共6页
Journal of Hebei Agricultural University
基金
科技部公益专项资助(200804027)
关键词
柞树林
直径结构
空间结构
Quercus mongolica
diameter structure
spatial structure
