Abstract:

708 species of seed plants affiliated to 405 genera in 119 families were discovered in riparian of Gan River based on field survey and analysis of geographical elements.There were 2 gymnosperm species belonging to 2 genera in 2 families and 406 angiosperm species belonging to 403 genera in 117 families.Among angiosperm,there were 548 dicotyledonous species belonging to 312 genera in 99 families,and 158 monocotyledonous species belong to 91 genera in 18 families.According to lifeform classification of plants group,herbs (6201%) were the dominants and deciduous component (7167%) in woody plant,which reflected the characteristics of ecological environment in Gan River riparian.Further flora analysis indicated that there were intrazonal feature of vegetation in this distinct being of prevailing widespread families (39.50%) and genera (15.31%),and complex distribution types of plant genera.Trop/TTemp value was 1.02，which embodied a transitional flora trait.Cluster analysis,principal component analysis and formula fitting implied the intersection of land and water.〖