海南五指山热带山地雨林植物物种多样性研究

王指山热带山地雨林的物种种类十分丰富，在１ｈｍ＾２样地中共出现５４个科，１００个属的乔木树种１７７种，１３３７个个体。区系地理分析表明属的分布区类型以热带分布型成分占优，为８９．０％，充分体现了五指山山地雨林的热带性质。多样性指数分析结果为：样地１Ｍａｒｇａｌｅｆ指数１７．８２２，Ｓｈａｎｎｏｎ－Ｗｉｅｎｅｒ指数５．６２１，均匀度０．８２３，Ｓｉｍｐｓｏｎ指数０．０５０，均匀度６．７７５，表明五指

The plant species diversity in a tropical montane rain forest on Wuzhi Mountain,Hainan

The tropical montane rain foreston Wuzhi Mountain,Hainan has abundant species.In a 1hm 2 there are 54 families,100 genus,177 plant species and 1337 individuals.The result of a floristic geographical study shows the major types of genus are tropical components(89.0%).It fully reflects the tropical characteristics of the montane rain forest on Wuzhi Mountain,Hainan.The result of diversity indices shows that in plot 1,Margalef index is 17.822,Shannon Wiener index is 5.900,evenness is 0.859,Simpson index is 0.028,evenness is 3.866.In plot 2,Margalef index is 17.381,Shannon Wiener index is 5.621,evenness is 0.823,Simpson index is 0.050,evenness is 6.775.It reflects that the tropical montane rain forest has high species diversity and high evenness,and the diversity of a low elevation plot is higher than that of a high elevation one.Fourty four singleton and 25 doubleton,respectively accounting for 24.9% and 14.1% of the total species number,are identified in the plots.These species with a low density and small population are more declined to extinct than the dominant species under any disturbance.The loss of the singleton and doubleton species will lead to a low species diversity in the community.