五指山市金钟藤种群分布格局分析

The distribution pattern of the populations of Merremia boisiana in Wuzhishan, Hainan Island

在五指山市金钟藤生长区域内选取3个样地对其分布格局进行野外调查分析。利用方差/均值比率法计算得到,A1和A3样地金钟藤种群呈集群分布,而A2样地金钟藤种群呈随机分布。此外,通过聚集强度指数分析发现,A1、A3样地金钟藤种群聚集强度指数I、m*/、I_δ对1.0的偏离程度明显,m*较大,且K值较小,符合种群聚集分布特征。A2样地金钟藤种群K值较大,其种群聚集强度指数I、m*/、I_δ对1.0的偏离程度不明显,且m*较小,符合种群随机分布特征。

Based on investigation data, the distribution pattern of Merremia boisiana populations in Wuzhishan area of Hainan Island was researched. The variance to mean ratio method was used to analyze the distribution pattern of three Merremia boisiana populations. The results showed that Merremia boisiana populations of A1 and A3 displayed clumped pattern, while the random pattern was indicated in the A2 population. Moreover, in clump intensity test, clump intensity（I）, patchiness index（m＊/x） and dispersal index（Iδ）, mean crowding（m＊） and parameter K of negative binomial distribution indicated A1 and A3 populations displayed clumped pattern, while all indices of the A2 population matched the characteristics of random distribution pattern.