RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2016, Vol. 25 >> Issue (09): 1395-1402.doi: 10.11870/cjlyzyyhj201609010

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ECOSYSTEM HEALTH ASSESSMENT OF POYANG LAKE WETLAND AND THE ASSOCIATED HYDROLOGICAL CONDITIONS

DAI Xue1,2, YANG Gui-shan1, WAN Rong-rong1, LI Bing1,2, WANG Xiao-long1   

  1. 1. Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2015-12-29 Revised:2016-02-25 Online:2016-09-20
  • Supported by:
    National Basic Research Program of China (2012CB417006);National Natural Science Foundation of China (41571107,41271500)

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Abstract: Based on the Ecological Health Comprehensive Index (EHCI) method, wetland ecosystem health assessment was conducted in the Poyang Lake wetland. The assessment results showed that:(1) for the wetland in spring during 1989-2010, the percentages of ‘healthy’, ‘sub-healthy’ and ‘ill’ ecological situation were 40%, 40% and 20%,respectively. (2) For the wetland in autumn during 1989-2010, the percentages of ‘healthy’, ‘sub-healthy’ and ‘ill’ ecological situation were 38%,46% and 15%, respectively. (3) For the annual wetland state during 1989-2010 the percentages of ‘healthy’, ‘sub-healthy’ and ‘ill’ ecological situation were 57%,43% and 0%, respectively. Based on a thorough analysis of the hydrological regime in the ‘ill’ ecological years, we found that:(1) hydrological condition in the rising season was decisive for wetland vegetation in spring. The effect trend was that high lake level in rising season resulted in small coverage area of the whole wetland vegetation. However, low lake level in rising season resulted in expansion of reed belts and shrinkage of sedge belts. (2) Hydrological condition in the flood season was decisive for wetland vegetation in autumn. The effect trend was that high lake level in flood season resulted in large coverage area of sedge belts and small coverage area of reed belts, and vice versa. (3)The ecological situation of Poyang Lake wetland were more stable on the annual scale than that in the seasonal scale, which was mainly induced by the stability discrepancy of lake level fluctuations in the inter-year and that in the intra-year. The result of this study may have some implications for the ecosystem health assessment of other littoral wetland, especially for those surrounded by lakes with dramatic water level fluctuations.

Key words: Poyang Lake, wetland vegetation, Ecological Health Comprehensive Index, hydrological condition

CLC Number: 

  • S423
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