The species composition,frequency and cover of species,and vegetation types of natural vegetation in Yan an,An sai and Wuqi in a transect of 174 samples in the abandoned lands in the hilly-gullied region of the North Shaanxi Province were analyzed and classified using TWINSPAN.The analysis of species composition shows that almost half of the species belong to the gramineae,compositae,leguminoseae and rosaceae,and nearly 75% of species belong to the north temperate,old world temperate,cosmopolitan and pantro...
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