野生罗汉果种群分布格局研究

Distribution pattern of natural Siraitia grosvenorii populations

采用方差/均值比率法对8个野生罗汉果种群的分布格局类型进行了分析,同时采用负二项式参数、扩散性指数、丛生指数、平均拥挤度指数和聚块性指数等计测这些种群的空间聚集强度。结果表明,罗汉果种群的分布格局呈随机或集群分布,不同种群的聚集强度有所差异。对这种分布格局形成的原因进行了分析。

Siraitia g rosvenorii, a dioecious, perennial and liana plant with root tubers, is an economically important species endemic to southem China. The distribution pattem of eight natural Siraitia grosvenorii populations in Guangxi were analyzed by the variance/mean ratio method,and their aggregated intensities were measured by using the following indices.negative binomial parameter,dispersal index,clumping index,crowing mean index and patchiness index. The results showed that the distribution pattems of the S. grosvenorii population were random or clumped,and the intensity was different among different populations. The causes of forming the distribution patterns were analysed.