Voronoi图方法确定云冷杉林最近邻木的适用性研究

以吉林省汪清林业局金沟岭林场天然云冷杉林标准地内147株树木为研究对象,选用最近邻木取4的传统方法和Voronoi图来确定每株树木的最近邻木株数和树号,对2种方法计算出的混交度和大小比数进行配对检验,并且对2种方法的适用性进行评价。结果表明:2种计算方法得出的结果具有较高的相关性和一致性,同为有效数据,但是传统方法计算出的混交度和大小比数要偏小;总体而言,天然云冷杉林具有较高的混交度、大小比数适中;相对于传统方法,利用Voronoi图来确定最近邻木时较为灵活。因此,在计算天然云冷杉林混交度和大小比数时,选用Voronoi图更为合理。

Study on the Adaptability of Voronoi Diagram on Determining the Nearest Neighboring Trees of Natural Mixed Spruce-Fir Forests

Based on the 147 trees of natural mixed Spruce-fir forest sample plots which are located in Jingou Forestry Farm of Wangqing Forestry Bureau in Jilin province,this paper tested the outcomes of calculating the spatial structure indexes based on Voronoi diagram and the outcomes of traditional algorithms that the nearest neighboring trees are 4.The GEMINUS test shows that the outcomes have significantly correlation and agreement between the two when calculating mingling and neighborhood comparison,both are effective results.But the outcomes of traditional method are lower than the outcomes of the Voronoi diagram.Overall,the mingling is higher and the neighborhood comparison is moderate of the natural mixed Spruce-Fir forests.Compared with the traditional method,determining the nearest trees based on Voronoi diagram is a more flexible.Therefore,Voronoi diagram is a more logical choice.