中文摘要：

本文以文峪河上游干流3个河段两侧9个河岸带样地及其毗邻高地12个样地的调查资料为基础,用DCA排序法及Margalef物种丰富度指数研究了各类群落物种分布格局及丰富度,结果显示：①河岸带植被存在从源头到下游的纵向格局和从河边到高地的侧向格局,其中纵向格局主要与海拔变化带来气候、土壤等因素的梯度分布有关,侧向格局是相对河流距离、相对河面高度、土壤湿度和养分梯度等因子的综合反映。②DCA排序不仅适合较大尺度下群落生境差异的分析,也适合很小范围内群落生境差异的分析,排序轴可以用海拔、相对河面位置和相对河面距离等因素来解释;③高地群落比河岸带群落在乔木层和草本层有更高的物种丰富度,在灌木层则较低,具体到每个河段情况又有所差异,不能确定河岸带群落就一定比高地群落有更高的物种丰富度。④适当的干扰可以提高群落某些层次的物种丰富度,干扰过度会降低群落某些层次的物种丰富度。

英文摘要：

Aims Riparian forests contribute to the diversity and function of both terrestrial and aquatic ecosystems,but we do not understand the disciplines of plant species diversity and vegetation distribution patterns between riparian vegetation and its adjacent upland.To reveal these disciplines,we compared plant species diversity and vegetation distribution patterns on temporary plots of upland forests and riparian zones in three representing reaches of Wenyuhe Watershed upstream of Shanxi province,China.Methods We chosen the three most representative reaches of the upstream of Wenyuhe Watershed： ① Spruce Reach： It had spruce forest climax community and less disturbed;② Birch reach： It represents birch forest or scrubland community,and had been disturbed by humans cutting and Livestock feeding;③ crop and pasture reach,riparian zones had been cleared for farmland,only had some remnant riparian meadow between farmland and river.We set up tree riparian zone plots（10m＊10m） and four high plots（10m＊10m） in each reach.Based on the data of community investigation,we used the Detrended Correspondence Analysis（DCA） and Margalef species richness index analyzed the riparian zone and its adjacent upland plots.Important findings ① a longitudinal pattern from upstream to downstream related to the changes of climate and soil with the gradient change altitude and a lateral pattern from river to adjacent upland related to relative distance to river,relatively high to river,soil moisture and nutrient were exist;and ② DCA ordering is not only suitable to analyses the differences of habitats in large scales,but also suitable to analyses it in a very small scales,ordination axes can be explained by altitude,relative location and relative distance to river,and other factors;and ③ species richness of upland communities were higher than it of riparian plant communities in the tree layer and herb layer,were lower than it in shrub layer.In specific circumstances of each river there were differences,so we can no