三峡库区香溪河流域河岸带种子植物区系研究

根据详细的植物群落调查资料，对三峡库区香溪河流域河岸带种子植物区系进行了研究。结果表明：河岸带维管束种类在科级水平上占神农架的65.8％，在属级水平上占47.3％，在种级水平上占26.7％。河岸带植物区系的性质为温带特性，与神农架地区种子植物属的性质相一致。河岸带这一独特自然景观的植物区系在整个区域自然景观中具有相当的代表性。在香溪河流域河岸带中，维管束植物种类较丰富，分布着大量的珍稀濒危植物种类，表明河岸带在生物多样性保护中具有重要的作用。

FLORA OF SEED PLANT IN RIPARIAN ZONE OF XIANGXI RIVER CATCHMENT IN THREE GORGES AREA

Of the known vascular plants, 127 families, 404 genera and 633 species (including taxa below the species level) were found along the riparian zone based on plot investigation. It included 9 families, 11 genera , and 12 species of the pteridophyta, 118 families, 393 genera,and 621 species of the seed plants. Of seed plants, there were 4 families, 8 genera , and 9 species of gymnosperm, 114 families, 285 genera, and 612 species of angiosperm. Among the plant taxa at the riparian zone, it accounted for 65.8% of Shennongjia Region in family level, 47.3% in genus level, and 26.7% in species level. The high level taxa of vascular plants are rich at the riparian zone in Xiangxi River Catchment. There are 29 protected plant species distributing along the riparian zone.In the component of the flora, the area-types of families were mainly tropical; and of the genera chiefly temperate. The component of flora in riparian zone was similar to that of Shennongjia region. The result showed that the riparian zone has an important role in maintaining regional biodiversity.