油松林林分空间结构分析及评价指数构建  

Analysis of Stand Spatial Structure and Construction of Evaluation Index of Pinus tabuliformis Forest

作　　者：张君钰 杨培华[1,2] 李卫忠 李显鲜[1] 郝红科 ZHANG Jun-yu;YANG Pei-hua;LI Wei-zhong;LI Xian-xian;HAO Hong-ke(College of Forestry,Northwest A&F University,Yangling 712100,Shaanxi,China;StateForestry and Grassland Administration Engineering Technology Research Center of Pinus tabuliformis,Yangling712100,Shaanxi,China)

机构地区：[1]西北农林科技大学林学院,陕西杨陵712100 [2]国家林业和草原局油松工程技术研究中心,陕西杨陵712100

出　　处：《西北林学院学报》2020年第5期166-172,共7页Journal of Northwest Forestry University

基　　金：国家重点研发计划(2017YFD060050104);国家重点研究发展计划项目(2016YFD0600203)。

摘　　要：分析油松生态公益林林分空间结构并进行评价,用客观数据直观的表现林分空间结构的特点,为培育多功能生态公益林奠定理论基础。以古城林场油松林100 m×100 m的样地实测数据为基础,根据林木坐标位置生成Voronoi图,确定空间结构单元。选取角尺度、大小比数、开敞度、林层指数4个空间结构参数对林分空间结构进行基础性分析。对各个空间结构参数采用乘除法进行多目标规划,并以变异系数法的思想根据各林分空间结构参数内部标准差的大小确定参数权重,提出林分空间结构评价指数,再根据该油松林生态公益林的特点,将评价指数值划分为5个等级。结果表明,角尺度的均值为0.35,整个林分处于随机分布的状态。大小比数的均值为0.50,整个林分大小分化不严重,林木的胸径差异不明显。开敞度均值为0.40,整个林分透光条件平均水平较好。林层指数均值为0.55,有73%的林木林层指数>0.50,表明该林分中林木绝大多数都与相邻木处于不同林层。该林分空间结构评价指数均值为0.48,林分空间结构整体状态一般。对林分空间结构的分析与空间结构评价指数的构建,不仅能了解到林分空间结构各个方面的状况,也能得知林分空间结构的整体状况,并为森林空间结构优化调整提供理论基础。To analyze and evaluate the stand spatial structure of Pinus tabuliformis ecological public welfare forest,and to directly show the characteristics of stand spatial structure with objective data,so as to lay a theoretical foundation for the cultivation of multi-functional ecological public welfare forest.Based on the measured data of the sample plots of P.tabuliformis forest each with a size of 100 m×100 m of in Gucheng Forest Farm,the Voronoi diagram was generated according to the tree coordinate position,and the spatial structure unit was determined.Four spatial structure parameters,including uniform angle index,neighborhood comparison,open degree and stand layer index were selected to analyze the spatial structure of the stand.The multiplication and division method was used for multi-objective programming of each spatial structure parameter,and the parameter weight was determined according to the internal standard deviation of each stand spatial structure parameter according to the idea of coefficient of variation method,and the stand spatial structure evaluation index was put forward.According to the characteristics of the ecological public welfare forest,the evaluation indices were divided into 5 grades.There sults showed that the mean uniform angle index was 0.35,and the whole stand was in the state of random distribution.The neighborhood comparison was 0.5,the size differentiation of the whole stand was not obvious,and the difference of DBH of trees was not obvious.The open degree of mean value was 0.40,the light condition of entire stand was overall good.Stand layer index average was 0.55,with 73%of stand layer index greater than 0.50,showing that most of the trees in the stand were in different layers with adjacent trees.The evaluation grade of the spatial structure of the stand was gradeⅢ.Through the analysis of stand spatial structure and the construction of evaluation index of stand spatial structure,we can know not only the situation of all aspects of stand spatial structure,but also the overall s

关 键 词：油松 生态公益林 VORONOI图 空间结构评价指数 

分 类 号：S791.254[农业科学—林木遗传育种]