Effects of temperature on phosphorus release in sediments of Hongfeng Lake, southwest China: an experimental study using diffusive gradients in thin-films (DGT) technique

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• 作者：Jingfu Wang ; Jingan Chen ; Shiming Ding ; Jing Luo ; Yang Xu
• 关键词：DGT ; Temperature ; Phosphorus release ; Sediments ; Hongfeng Lake
• 刊名：Environmental Earth Sciences
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：74
• 期：7
• 页码：5885-5894
• 全文大小：1,829 KB
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• 作者单位：Jingfu Wang (1)
  Jingan Chen (1)
  Shiming Ding (2)
  Jing Luo (3)
  Yang Xu (3)
  
  1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China
  2. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China
  3. College of Resources and Environmental Engineering, Guizhou University, Guiyang, 550025, 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

The effects of temperature on phosphorus (P) release in sediments of Hongfeng Lake, southwest China, were investigated under simulation condition. The distributions of labile P in sediments were measured in situ using a diffusive gradients in thin-films (DGT) technique (Zr-oxide DGT) at a two-dimensional, sub-millimeter spatial resolution. The changes of P fractions in sediments at different temperatures were also investigated using a chemical fractionation technique which divided sediment P into NH₄Cl–P, BD–P, NaOH–P, HCl–P, and Residual P. The results showed that the concentrations of labile P in sediments increased rapidly as the simulating temperature increased, reflecting a rapid P release from sediments. The NaOH–P concentrations in sediments showed the greatest decrease (accounting for 79.3 % of total decrease) during the experiment, suggesting that the increase of labile P in sediments was mainly due to the transformation of NaOH–P. The release of HCl–P also occurred in sediments, increasing the labile P concentration in pore waters. The seasonal variation of temperature and its induced biological–chemical changes at the sediment–water interface (such as organic matter degradation, and respiration) might be an important factor affecting the P release in sediments of Hongfeng Lake. Our results provide new information for illuminating P biogeochemical cycling processes at the interface in eutrophic lakes. Keywords DGT Temperature Phosphorus release Sediments Hongfeng Lake