关键词: 红树林生态系统, 林分空间结构, 均质性目标, 均质性指数, 灰色关联度分析法

Abstract:

Based on the research of natural forest spatial structure in China and abroad,and combined with the theory of landscape ecology,this paper proposed the homogeneity target optimizing the forest stand spatial structure of mangrove,and the new concept of homogeneity index.Parameters affecting the forest stand spatial structure homogeneity were formatted into multiple-objectives parameters.We also put forward the definition and the quantifying formula of homogeneity index.GRA(grey relation analysis) was for the first time used to analyze relationship between forest homogeneity index and factors,which were derived a set of survey data,influencing mangrove forest stand spatial structure in different tidal zones in Mangrove Nation Natural Reserve at Zhanjiang,Guangdong.The case study indicated that the relationship and priority order between influencing factors and homogeneity index are:competition index 0.716>mingling 0.686>spatial density index 0.670>Purpose tree species characteristic index 0.644>neighborhood pattern 0.638> neighborhood comparison 0.616> Health index 0.607.The forest homogeneity index can objectively reflect mangrove's influences on forest stand homogeneity,and this study provided a theoretical basis for establishing an optimized model of forest spatial structure in mangrove ecological systems.

Key words: mangrove ecological system, stand spatial structure, target of spatial structure, homogeneity index, grey relation analysis