Nitrogen distribution and ammonia release from the overlying water and sediments of Poyang Lake, China

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• 作者：Zhiping Yang ; Lingqing Wang ; Tao Liang ; Manxiang Huang
• 关键词：Sediment ; Overlying water ; Nitrogen ; Ammonia release ; Eutrophication
• 刊名：Environmental Earth Sciences
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：74
• 期：1
• 页码：771-778
• 全文大小：3,162 KB
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• 作者单位：Zhiping Yang (1)
  Lingqing Wang (1)
  Tao Liang (1)
  Manxiang Huang (1)
  
  1. Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：None Assigned
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-6299

文摘

Poyang Lake is the largest freshwater lake in China and is one of the two largest lakes connected with the Yangtze River. It is an overflow lake which absorbs and releases water seasonally. To evaluate the geochemical cycling of nitrogen (N) in Poyang Lake, the spatial distributions of ammonia nitrogen (NH4 +–N), nitrate nitrogen (NO3 ?/sup>–N) and total nitrogen (TN) in sediments and overlying water were measured. The experimental results showed that the average concentrations of TN in the sediment samples, surface water, and bottom water samples from Poyang Lake were 1,107.375?mg?kg?, 1.998 and 2.237?mg?L?, respectively. The highest concentrations of TN were measured in the water and sediment obtained from the river tail region south of Poyang Lake, with decreasing pattern from south to north affected by the river input. The contribution of TN to the internal load played an important role on N distribution in the overlying water. The vertical distribution of TN in sediment cores of Poyang Lake showed a decreasing trend with depth. The NH4 +–N content in sediment cores initially decreased with depth and then increased slowly. The NO3 ?/sup>–N content in sediment cores exhibited an inverse trend compared with that of NH4 +–N due to the influence of nitrification and denitrification processes. Release kinetic experiments of NH4 +–N demonstrated that the maximum NH4 +–N release rate occurred within first 5?min and reached 90-4?% of the maximum value within 0-0?min.