RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2015, Vol. 24 >> Issue (08): 1345-1350.doi: 10.11870/cjlyzyyhj201508012

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DIVERSITY AND SPATIAL DISTRIBUTION OF VEGETATION FROM THE WATER-LEVEL FLUCTUATION ZONE OF THE XIANGXI RIVER IN THE THREE GORGES RESERVOIR AREA

XU Jian-xia, PENG Gang-zhi, WANG Jian-zhu   

  1. College of Biology and Pharmacy, China Three Gorges University, Yichang 443002, China
  • Received:2014-10-27 Revised:2015-07-15 Online:2015-08-20
  • Contact: 王建柱 E-mail:wangjianzhu@126.com E-mail:wangjianzhu@126.com

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Abstract: Vegetations at different elevations from the water-level fluctuation zone (WLFZ) of Xiangxi River in the Three Gorges Reservoir (TGR) area were collected with quadrat sampling method to assess species composition, community diversity and spatial distribution characteristics 10 years after the TGR impoundment in 2003. The objectives of this study were to provide scientific basis on species selection and plant community reconstruction in ecological restoration of WLFZ in TGR area. The results show that: (1) the main plant types in the study area were annual herbs, species composition was relatively simple. The spatial distribution of all the dominant populations belongs to the type of aggregated distribution; (2) As the elevation increased, most of the α and β diversity indexes i.e., Patrick richness, Shannon-wiener diversity, and Pielou evenness tended to increase, while the other α diversity indexes including Simpson diversity decreased. Among the β diversity indexes, Cody index, Wilson Shmida index, Jaccard index and Sorenson index all showed an increasing trend; (3) Cynodon dactylon, Digitaria Sanguinalis, Setaria viridis and Cyperus rotundus are recommended as alternative herbaceous species to be used in plant community reconstruction in the ecological restoration of the WLFZ of Xiangxi River in the TGR area.

Key words: Three Gorges Reservoir, water-level fluctuation zone, community diversity index, spatial distribution characteristics

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