Influence of Human Disturbance on Plant Diversity and Importance Value of Syzygium hancei Communities
The species richness index (S), Shannon-Wiener diversity (H'), Simpson index (D), Pielou's evenness index (Jsw) and importance value of the Syzygium hancei communities in coastal ecotone of Guangxi were investigated and analyzed with the typical quadrat method. A total of 98 plant species, belonging to 42 families and 80 genera, were recorded in the S. Hancei communities of the 3 sample plots investigated. No significant difference in species diversity was noticed among the tree layer, the shrub layer and the herb layer. According to the coefficients of variation of different layers, their H , D and Jsw all appeared in the order of shrub layer > tree layer > herb layer. The importance value of S. Hancei under mild, moderate and severe human disturbance was 204. 83%, 77. 71% and 114. 58%, respectively. An a-nalysis of the importance value of shrubs indicated that there were more kinds with over 10 % with increasing disturbance degree and that the maximum importance value appeared in G2 (moderate disturbance). S. Hancei communities proved to be fairly resistant to stress environment, and moderate disturbance helped to promote the succession and updating of the communities.
coastal ecotoneSyzygium hanceibiodiversityimportance value
NETL
NSTL
万方数据
维普
