楚雄紫溪山南坡植物物种多样性的海拔梯度分布格局研究

采用样地调查法对紫溪山南坡植物物种多样性的垂直分布格局进行调查,运用丰富度指数、香农指数、辛普森指数和均匀度指数4个指标分别对植物物种多样性、木本植物物种多样性和草本植物物种多样性加以分析。结果表明:1)随着海拔高度的增加,植物物种多样性的3个指标丰富度指数、香农和辛普森多样性指数先升高后降低,呈现出单峰分布格局,而均匀度指数则逐渐升高,呈现出正相关格局。2)木本植物物种多样性的4个指数均随着海拔高度的增加先升高后降低,呈现出单峰分布格局。其中,乔木层植物物种多样性4个指数与木本植物物种多样性4个指数表现一致;而灌木层植物物种多样性的4个指数则表现为先升高后降低,再次升高后降低的趋势,呈现出近似双峰的分布格局。3)草本层植物物种多样性4个指数也呈现出近似双峰的分布格局。

Altitudinal Pattern of Plant Species Diversity on Southern Slope of Zixi Mountains in Chuxiong City

With the method of sample plot investigation,plant species diversity of southern slope on Zixi Mountains was studied.Four indicators including Margalef index,Shannon index,Simpson diversity index and Pielou index were chosen for analyzing the diversity of plant,woody plant and shrub plant one by one.The results showed that(1)as altitude increasing,Margalef index,Shannon and Simpson diversity index of plant species diversity all increased first and then decreased,presenting a single-peak distribution pattern,while Pielou index increased all the time with altitude increasing,appearing a positive correlation pattern;(2)the four indexes of woody plant species diversity were all increasing at first and then decreasing,showing a single-peak distribution pattern,the four indexes of tree species diversity all appeared a single-peak distribution pattern as well;(3)the four indexes of shrub and herb species diversity all increased first and then decreased,and then increased and decreased again,appearing a pattern of bimodal distribution.