Study on the Niche Characteristics of Main Tree Populations in Tropical Mountain Rain Forest at Jianfengling, Hainan lsland

In this paper,the niche characteristics of main tree populations in tropical mountain rain forest(20 species for original and 33 species for regenerative forest)have been measurted at Jianfengling of Hainan Island.The niche characteristics included niche breadth,niche proportional similarity and niche overlap. The results indicated that:① all of the species in the original forest have the narrow niche,only several species in the regenerative forest have broader niche such as Castanopsis fissa,Sapium discolor,C.tonkinensis etc. according to the Shannon-Wienner's and Levins' niche breadth indexes;② the Colwell and Futugma's proportional similarity index and Levins' overlap index values of all pairs species are very low.In the tropical forest,the relationship between populations are very complex and many species share with the resources in a small biotope.