基于Voronoi图的北京公园常见林分空间结构分析  

Common Stand Spatial Structure in Beijing Parks Based on Voronoi Diagram Method

作　　者：朱俐娜 彭祚登[1] 

机构地区：[1]北京林业大学省部共建森林培育与保护教育部重点实验室,北京100083

出　　处：《西北林学院学报》2015年第5期176-180,共5页Journal of Northwest Forestry University

基　　金：北京市科技计划"首都平原百万亩造林科技支撑工程"(Z121100008512002);北京市科技计划"应对PM2.5空气污染的北京造林工程关键技术研究与示范"(Z121100000312069)

摘　　要：探究北京平原人工林的林分空间结构，为合理经营森林提供依据。采用混交度、大小比数和聚集指数3个指数，基于Voronoi图空间结构单元分析北京平原常见林分的空间结构特征。林分中存在8种空间结构单元，以1株对象木和5株最近邻木的空间结构为主；除了阅叶纯林外，其余各林分平均混交度处于0．352～0．838，树种间隔离程度有弱度混交、中度混交和强度混交；各林分平均胸径大小比数处于0．441～0．675，表明林分水平异质性不高，林分处于中等竞争状态；林分聚集指数处于0．894～2．037，除了9号和12号样地呈聚集分布，其余各林分均呈均匀分布。林分空间结构基本合理。建议在采取经营措施前，对林分空间结构做出诊断。To explore plantation stand spatial structures in Beijing plain area and provide evidences for reasonable management of the forest, the spatial structure features （including mingling, neighborhood comparison,and aggregation index） of common forest stands in Beijing parks were analyzed by using Voronoi diagram method. There were 8 kinds of spatial structural units, dominated by 1 target tree with 5 nearest neighbor trees. Except for broad-leaved pure forest, the average mingling degrees of the stands were between 0. 325 and 0. 838, which indicated the degreed of segregation among tree species were between weak and strong. The average neighborhood comparison rates based on DBH were between 0. 441 and 0. 675. The differentiation of DBH was not significant, which indicated a middle level of competition. The aggre- gation indices of the stands were between 0. 894 and 2. 037, which indicated that the spatial distribution patterns were even distribution while number 9 and 12 plots were aggregated distribution. Spatial structure was basically reasonable. It was suggested that before taking managing measures, diagnosis of the stand spatial structure should be conducted.

关 键 词：人工林 VORONOI图 林分空间结构 混交度 大小比数 聚集指数 

分 类 号：S758.53[农业科学—森林经理学]