长江三峡地区干流河岸植物群落的初步研究

PRELIMINARY STUDIES ON THE RIPARIAN PLANT COMMUNITIES OF MAIN CHANNEL IN THE THREE GORGES AREA, THE YANGTZE RIVER

以长江三峡干流河岸植物群落为研究对象，对群落的物种组成、物种多样性进行了分析，并利用TWINSPAN方法对植物群落进行等级式划分。结果表明：河岸植物区系组成较为复杂，以温带成分为主，有着较高比率的世界分布成分。植物生活习性方面，草本种类的比率略高于木本种类，藤本种类较少。灌、草丛群落之间的物种多样性差异不显著。TWINSPAN和DCA分析显示，河岸植物群落可分为6大类群，这些类群呈现沿湿度梯度方向的分布格局。

The components of flora and plant species diversity of riparian plant communities of main channel in the Three Gorges area, and the hierarchical classification by the methods of TWINSPAN and DCA ordination were studied. The results showed that the components of flora were complex, the temperate type was dominant. The herbaceous habit of species was a little more than woody. The difference of plant species diversity between shrubland and grassland was not obvious. TWINSPAN divided the riparian plant communities into 6 groups for three levels . The distribution of groups seemly related with the moisture of habitats of plant communities. The habitat included floodplain, zone between upland and floodplain, beside water and stone gap near water. DCA indicated that riparian plant communities distributed along the gradient of moisture. 6 groups of riparian plant communities could be distinguished clearly in ax1 of DCA.