树种空间隔离程度是研究林分空间结构的一个重要内容,通常用混交度来进行描述。现有的各种混交度指数在描述对象木与最近邻木为其他种的概率时只有相同种或不同种两种结果,不能完全说明树种的混交程度。在传统混交度的基础上结合树种谱系关系提出树种混交度的概念,以湖南省内5个林区的25块样地数据,对传统混交度与树种混交度进行了比较分析,并使用树种混交度进行了林分模拟优化。结果表明:树种混交度与传统混交度之间存在较强的相关性,且能进一步细化结构单元中树种的隔离程度,可运用于林分空间结构的评价与优化。

Spatial segregation degree of tree species is an important content in the study of stand spatial structure,which is usually described by the mingling degree.The existing mingling degree indices only have the same species or different species results when describing the probability that the object tree and the nearest neighbor tree are different species,which cannot fully explain the mingling degree of tree species.Based on the traditional mingling degree and tree species pedigree relationship,the concept of tree species mingling degree was put forward in this paper.The traditional mingling degree and tree species mingling degree were compared and analyzed with 25 sample plots in 5 forest regions of Hunan Province,and the stand simulation and optimization were carried out by using tree species mingling degree.The results showed that there was a strong correlation between tree species mingling degree and traditional mingling degree,and tree species mingling can further refine the isolation degree of tree species in the structural unit,which can be used for the evaluation and optimization of stand spatial structure.