为探讨随着湘江水位的周期性变化是否导致河岸带植物群落多样性的变化，在长沙城区段的湘江东岸设置了30个样方进行调查。计算群落各层次的重要值以及Patrick丰富度指数、Shannor-Wiener多样性指数、Simpson优势度指数和Pielou均匀度指数等对群落多样性进行分析。结果表明：（1）湘江长沙城区段河岸带植物群落物种较丰富，样方中共出现62种植物，隶属于59属30科；（2）群落中乔灌藤草各层次的重要值分别为26%、27%、2%、68%，丰富度指数分别为11、7、4、40，多样性指数分别为0.77、0.68、0.11、2.00，优势度指数分别为0.01、0.01、0、0.02，均匀度指数分别为0.19、0.16、0.03、0.49。群落各层次的4种多样性指数具有相同的趋势，均表现为草本层＞乔木层≥灌木层＞藤本层；（3）草本层的重要值与各多样性指数最大，草本层的生态功能地位明显，可作为河岸带生态修复的物种选择对象。%In order to explore whether or not with the periodical change of the Xiangjiang river had resulted in the change of plant community diversity of riparian zone, we set up 30 samples randomly for the field investigation, between the Houzishi bridge with the Xiangfu bridge along the eastern coast of the Xiangjiang river. We analyzed the diversity of the communities by calculating the important values, the Patrick index, the Shannor-Wiener index, the Simpson index, and the Pielou index of all layers of the communities. The results showed that:The plant community species were rich of the riparian zone in Xiangjiang river of Changsha urban area section, there were 62 kinds of plants in the samples, belonging to 59 genera and 30 families;The important values of arbor layer , shrub layer, liana layer and herb layer were 26%, 27%, 2%, 68%;The Patrick index of arbor layer , shrub layer, liana layer and herb layer were 11, 7, 4, 40, the Shannor-Wiener index were 0.77, 0.68, 0.11, 2.00, the Simpson index were 0.01, 0.01, 0, 0.02, the Pielou index were 0.19, 0.16, 0.03, 0.49. The 4 species diversity indexes had the same trend of all layers of the community, appeared as herb layer>arbor layer≥shrub layer>liana layer. Among them, the important values and the diversity indexes of the herb layer were the largest, which showed that the herb layer was the most suitable for the complex habitats of the riparian zone in Xiangjiang river of Changsha urban area section, and the ecological function was obvious. The herb layer plants can be used as the species selection object of ecological restoration of the riparian zone.
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