中文摘要：

河岸带是河流—陆地生态系统的重要生态交错带,具有独特的生态系统结构和功能.基于植物群落的野外标准样方调查,采用双向指示种分析（TWINSPAN）和除趋势对应分析（DCA）的多元分析方法,对赣江河岸带植物群落进行数量分类与排序.TWINSPAN将所调查的109个样方分为7组.DCA排序将TWINSPAN分成7组的第1和2组合成了一个植被类型,其余类型与TWINSPAN分类的结果比较一致.结合分类与排序结果,可将赣江河岸带植被分为6个植被类型：河岸带草丛、河岸落叶阔叶群落、河漫滩草甸、河岸常绿阔叶林、河岸针阔混交林、岗地马尾松林,这6个植被类型在赣江河岸带有明显的分布格局.赣江河岸带植被为典型的隐域性植被,然而其物种组成又兼具中亚热带常绿阔叶林地带的烙印.受人为活动影响,河岸带植被结构及其功能均发生退化.因此,亟需加强河岸带恢复重建和生态系统管理.

英文摘要：

Riparian zones are the interfaces between terrestrial and aquatic ecosystems. We examined the vegetation of riparian areas in Gan River of the Poyang Lake Stream, focusing on how persistent human disturbance and riparian geomorphology influence the structure and composition of ground-flora vegetation. We collected data from 109 standard samples among three different disturbance types and reaches in Gan River Stream. Along each samples we measured： （1） overstory basal area, species composition, and canopy closure on a series of 400 m2 plots; （2） under story species composition and canopy on a series of 36 mz plots; （3） herb communities on a series of 1 mz plots; （4） disturbed and physiographic data （e.g. longitude and latitude, elevation, gradient, river width, bank height, flow velocity）. Based on the field survey data, the communities on Gan River riparian were classified and ordinated by multivariate statistical analysis of two-way indicator species analysis （TWINSPAN） and detrended correspondence analysis （DCA）. As a result, the vegetation of Gan River riparian classified the samples into six vegetation types： riparian ruderal grasses, riparian deciduous communities, floodplain meadow, riparian broad-leaved evergreen communities, riparian temperate mixed forest, Pinus massoniana communities. Using correlation analysis for DCA two axis and environmental factors, the factors of gradient, height of riparian, disturbance methods, slope has the significant correlation with AX1, but the factors of elevation, gradient, slope has the significant correlation with AX2. It is suggested that soil moisture, landform and disturbance were the important factors for understanding the Gan River vegetation patterns. This six vegetation types has obvious distribution pattern, river-margin tussock, floodplain meadow and riparian deciduous communities distributed in middle and lower reaches, and other three types of vegetation distributed in upper middle valley riparian. The riparian zone vegetation