不同起测胸径对判定油松分布格局的影响  

Effects of minimum measured diameter on determining spatial distribution patterns of Pinus tabulaeformis forest trees

作　　者：牛丽丽[1] 余新晓[1] 刘彦[1] 岳永杰[1] 李金海[2] 武军[2] 

机构地区：[1]水土保持与荒漠化防治教育部重点实验室北京林业大学水土保持学院 [2]北京市园林绿化局防沙治沙办公室

出　　处：《北京林业大学学报》2008年第S2期12-16,共5页Journal of Beijing Forestry University

基　　金：“十一五”国家科技支撑计划项目(2006BAD03A02);北京市科委重大项目(D0706001000091)

摘　　要：起测胸径是影响调查结果的重要因素,它直接影响对森林结构的合理划分、森林资源的准确计量以及对林分内部特征的正确把握。该文在对100m×80m的油松林样地调查的基础上,采用RipleysK函数分析了不同起测胸径下油松林个体的空间分布格局。结果表明:油松林的胸径结构分布不均匀;油松种群呈现明显的集群分布,且分布格局随着尺度和起测胸径的变化而变化。在同一尺度下,油松林空间分布格局的判定与起测胸径的大小有关,起测胸径不同,分布类型也会有变化,并且这种变化没有规律性。因此,在分析林木空间分布格局时应采用相同的起测胸径。Minimum measured diameter(MMD)is an important factor that affects forest inventory results.It directly affects the rational division of forest structure,accurate measurement of forest resource,and right understanding of internal characteristics of a stand.By using Ripley's \%K\% function,this paper analyzed the data from 100 m×80 m Pinus tabulaeformis forest plots with varied MMD to identify tree spatial distribution patterns.It shows that the distribution of DBH structure of the Pinus tabulaeformis forest is uneven。Population of the Pinus tabulaeformis is clearly in group distribution,and the spatial pattern varies with different scale and MMD.In the same scale,the tree spatial distribution pattern is related to MMD.Different MMD leads to irregularly changed spatial distribution patterns.Therefore,same MMD should be adopted in the analysis of tree spatial distribution patterns.

关 键 词：起测胸径 空间分布格局 Ripley’s K函数 

分 类 号：S791.254[农业科学—林木遗传育种]