Based on the vegetation survey of 14 sampling sites in water-level fluctuation zone of the Three Gorges Reservoir, the vegetation characteristic and species diversity after flooding to 173 m were reported. Canonical correspondence analysis (CCA) was used to explore the environmental interpretation of vegetation variation. The result showed that there were 175 species of 58 families in the water-level fluctuation zone. Setaria viridis, Conyza Canadensis, Bidens tripartita, Paspalum thunbergii, Polygonum lapathifolium, Xanthium sibiricum, Paspalum paspaloides, Cynodon dactylon and Digitaria spp. were the dominant vascular plants. Therophytes were the most abundant life form with 84 species. There were 54 vegetation community types, including 5 shrub and 49 herb associations. The results of CCA reflected that vegetation predominantly disturbed in the upper area with low slope and fine substratum. Species diversity and annual taxa increased as elevation rose which reflected the influence of submerged gradient. Long-term winter flooding, enormous water magnitude and summer drought were the important reasons for the vegetation composition.
WANG Qiang, YUAN Xing-zhong, LIU Hong, ZHANG Yue-wei, CHEN Zhong-li, LI Bo
. Effect of Initial Impoundment on the Vegetation and Species Diversity in Water-level Fluctuation Zone of the Three Gorges Reservoir[J]. JOURNAL OF NATURAL RESOURCES, 2011
, 26(10)
: 1680
-1693
.
DOI: 10.11849/zrzyxb.2011.10.005
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