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Periphytic biofilm: A buffer for phosphorus precipitation and release between sediments and water

文献类型: 外文期刊

作者: Lu, Haiying 1 ; Wan, Juanjuan 1 ; Li, Jiuyu 1 ; Shao, Hongbo 2 ; Wu, Yonghong 1 ;

作者机构: 1.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Jiangsu, Peoples R China

2.Jiangsu Acad Agr Sci, Inst Agrobiotechnol, Nanjing 210014, Jiangsu, Peoples R China

3.East China Jiaotong Univ, Sch Civil Engn, Nanchang 330013, Jiangxi, Peoples R China

关键词: Phosphorus;Overlying water;Precipitation;Periphyton;Sediment

期刊名称:CHEMOSPHERE ( 影响因子:7.086; 五年影响因子:6.956 )

ISSN:

年卷期:

页码:

收录情况: SCI

摘要: The influence of periphytic biofilm on phosphorus (P) content and species between water and sediment interfaces was evaluated in a simulated experiment. Results showed that the concentration of all P species (TP, TDP, DIP, PP, and DOP) in overlying water decreased to significantly low levels (<0.05 mg L-1) in the presence of periphytic biofilms, while the TP increased (>1.8 mg L-1) in the control (without periphytic biofilm). Periphytic biofilm increased the water pH (maximal value at about 10) favoring co-precipitation between P and metal salt. The presence of periphytic biofilm also slowed the loss of P fractions such as Fe/Al-P and Ca-P from sediment. In addition, the P content of periphytic biofilms, mainly in forms of Fe/Al-P and Ca-P, increased by 100% after 60 d. These results suggested that periphytic biofilm was capable of entrapping P from water, attenuating P release, and storing P as a sink, thereby forming a buffer for P release and precipitation. This study not only offers some valuable insights into the role of periphytic biofilms or similar microbial aggregates in P biogeochemical processes in water-sediment interfaces, but also contributes to the management of water eutrophication from internal P loadings. (C) 2015 Elsevier Ltd. All rights reserved.

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