Effects of Inter-Annual Water Level Fluctuations on Vegetation Evolution in Typical Wetlands of Poyang Lake, China

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• 作者：Hailin You ; Ligang Xu ; Guilin Liu ; Xiaolong Wang ; Yongming Wu ; Jiahu Jiang
• 关键词：Vegetation evolution ; Water level fluctuation ; Typical delta wetland ; Poyang Lake
• 刊名：Wetlands
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：35
• 期：5
• 页码：931-943
• 全文大小：2,638 KB
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• 作者单位：Hailin You (1) (2)
  Ligang Xu (1)
  Guilin Liu (3)
  Xiaolong Wang (1)
  Yongming Wu (2)
  Jiahu Jiang (1)
  
  1. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, Nanjing, 210008, People鈥檚 Republic of China
  2. Poyang Lake Research Center, Jiangxi Academy of Sciences, Nanchang, 330096, China
  3. Department of Environmental Remote Sensing and Geoinformatics, University of Trier, D-54286, Trier, Germany
  
• 刊物主题：Freshwater & Marine Ecology; Environmental Management; Ecology; Hydrogeology; Coastal Sciences; Landscape Ecology;
• 出版者：Springer Netherlands
• ISSN：1943-6246

文摘

The frequency and amplitude of water level fluctuations were major driving forces for wetland vegetation evolution in the Poyang Lake Deltas. This study examined changes in wetland vegetation evolution of two deltas, namely Ganjiang Main-branch Delta wetland (GMD) and Ganjiang Southern-branch Delta wetland (GSD), in autumns from 1973 to 2009. Wetland vegetation evolution monitoring using Landsat remotely sensed imageries was related to changes in hydrology stemming including the annual peak, lowest water levels and number of flooded days at four characteristic water levels (10, 13, 15 and 17 m) from natural climatic variations. Results showed that the annual peak water level of GMD (Xingzi station) decreased by 5.78 m and the annual lowest water level decreased by 2.27 m; while the annual peak water level of GSD (Tangyin station) decreased by 6.41 m and the annual lowest water level decreased by 2.53 m. The number of flooded days at water levels 15 and 17 m indicated a consistent trend while flooded days at water levels 10 and 13 m were significantly different. Vegetation coverage of both deltas showed trends of increasing and expanded fan-shaped towards the middle of the lake area. The annual peak and lowest water levels had negative correlation with the vegetation coverage areas for both deltas. The flooded days at water level 13 m had the greatest effect on the vegetation coverage area at GMD; while the flooded days at water level 17 m had the greatest effect on the vegetation coverage area at GSD. Keywords Vegetation evolution Water level fluctuation Typical delta wetland Poyang Lake