浙西南地区沉水植物的区系分布与物种多样性

2007～2008年对浙西南地区的婺江、衢江及瓯江流域沉水植物的种类组成、区系类型及群落特征进行了调查研究。结果表明:(1)该地区共有沉水植物6科8属19种,在属水平上可归纳为3个区系类型,在种水平上可分为7个区系类型,并且在属种水平上的主要分布类型不同。(2)9个典型样地的13个群落类型进行了β-、γ-多样性分析。群落间β-多样性Jaccard指数显示89.8%群落间的相似性低于0.5,各样地的y-多样性则在衢江水域为最高(14种),瓯江水域最低(9种),这与不同水域沉水群落分布的研究结果相一致。并认为该地区沉水植物多样性降低是环境因子与人为干扰共同作用的结果。

The Floristic Distribution and Species Diversity of Submerged Plant in the Southwest of Zhejiang Province

The species composition, floristic distribution, and characteristics of submerged plant community in Wu River, Qu River and Ou River in the southwest of Zhejiang Province were surveyed during 2007 and 2008. The results showed that: (1)There were 19 species belonging to 6 families and 8 genera. Three areal-types were classified from these genera, and 7 areal-types were classified from species, and the main distribution types between these two levels were different. (2) Thirteen submerged plant communities in 9 typical sites were analyzed by β- and y-diversity indexes. The β-diversity Jaccard index showed the species comparability of 89.2% communities was lower than 0.5. The highest γ-diversity index (14 species) was found in Qu River, while the lowest γ-diversity index (9 species) was observed in Ou River, which was consistent with the community distribution in other different rivers. It suggests that the low diversity of submerged plants in this area is due to interaction of environment factors and disturbance of human activities.