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作 者 ：徐新伟,吴中华,于丹,刘春花,李中强,肖克炎

期 刊 ：生态学报 2002年 22卷 11期 页码：1933~1938

关键词：汉江；水生植物；多样性；

Keywords:Hanjiang River, aquatic plants, diversity,

摘 要 ：1997～ 2 0 0 0年对汉江中下游 8个江段水生植物种类组成、分布、生物量做了调查。汉江中下游共有水生植物 1 8科2 2属 3 4种 ,以世界广布种为主 ,R/ T值为 0 .67。中游以沉水植物群落为优势 ,建群种为轮叶黑藻 (Hydrilla verticillata)、穿叶眼子菜 (Potamogeton perfoliatus)和微齿眼子菜 (P. maackianus) ;下游主要为挺水植物群落 ,建群种为东方香蒲 (Ty-pha orientalis)和芦苇 (Phragmites communis) ,生物量为 5 7.5～ 2 1 0 0 g/ m2 ;α-多样性在丹江口最高 (0 .5 46) ,老河口次之(0 .5 1 7) ,仙桃最低 (0 ) ;生活型多样性在中游丹江口最大 (0 .40 2 ) ;β-多样性在时间梯度 6～ 8月份在所有样点 β=0 ,水平梯度β=0 .79,垂直梯度β=1 .48;γ-多样性在汉江中游为 2 9种 ,在下游为 1 0种。中游地区水生环境适合水生植物生长 ,而下游人类活动导致水环境趋于恶化限制了水生植物分布。

Abstract:The species composition, distribution, biomass, diversity of aquatic plants in eight sections of Hanjiang River were surveyed during 1997~2000. There were 34 species belonging to 22 genera and 18 families in the middle\|reaches and the lower reaches of Hanjiang River which were dominated by the cosmopolitan species and the R/T value was 0 67. In the middle reaches ,they were mainly dominated by the submerged plant communities, and the constructive species were such as: Hydrilla verticillata, Potamoge...

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