摘要
基于Microsoft Visual Studio平台构建Voronoi图和Delaunay三角网空间模型,开发林分空间结构分析软件,并应用到凉水国家级自然保护区大面积针阔混交林固定监测样地的林分空间结构分析中。应用数理统计方法计算研究区21个标准样方(100 m×100 m)内胸径5 cm以上林木的Voronoi图变异系数、平均混交度和平均大小比数。结果表明:21个标准样方Voronoi图的总体变异系数为0.66,呈现出轻微的聚集分布状态;单一树种(活立木株数大于500株)的变异系数呈现明显的聚集分布形式。根据Delaunay三角网取值确定最近相邻木得到的平均混交度在0.79左右,胸径大小比数、树高大小比数以及冠幅大小比数平均值均为0.49,说明研究区内树种隔离程度较高,大小分化度适中,林分结构比较稳定。
Based on Microsoft Visual Studio,the Voronoi diagram and Delaunay triangulation model were established and the forest stand spatial structure analysis software was developed. This software was applied in the analysis of the stand spatial structure characteristics of large-area fixed monitoring plot in the Liangshui Natural Reserve. The method of mathematical statistics was applied to calculate the variation coefficients of Voronoi diagrams,average mingling degree,and average comparison of all individual trees with diameter at breast height( DBH) greater than 5 cm within 21 standard sampling plots( 100 m× 100 m). It was seen that the general Voronoi diagram coefficient of variation of the 21 sample plots was 0.66,thereby showing the status of light clustering. The coefficient of variation for single tree species( number of trees greater than 500) showed obvious clustering. The average mingling degree based on Delaunay triangulation network was approximately 0.79,whereas the DBH comparison,height comparison,and canopy comparison were approximately 0. 49. This indicates that the isolation degree of different tree species was higher,the comparison was medium,and the spatial structure was relatively stable.
引文
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