title: Periphytic biofilm: A buffer for phosphorus precipitation and release between sediments and water.
abstract: 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.
authors.affiliation: State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, 71 East Beijing Road, Nanjing 210008, China; Institute of Agro-Biotechnology, Jiangsu Academy of Agriculture Sciences, No. 50, Zhongling Road, Nanjing 210014, China.
authors.forename: Haiying
authors.initials: H
authors.lastname: Lu
authors.affiliation: State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, 71 East Beijing Road, Nanjing 210008, China; School of Civil Engineering, East China Jiaotong University, 808 Shuang Gang East Road, Nanchang, Jiangxi, 330013, China.
authors.forename: Juanjuan
authors.initials: J
authors.lastname: Wan
authors.affiliation: State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, 71 East Beijing Road, Nanjing 210008, China.
authors.forename: Jiuyu
authors.initials: J
authors.lastname: Li
authors.affiliation: Institute of Agro-Biotechnology, Jiangsu Academy of Agriculture Sciences, No. 50, Zhongling Road, Nanjing 210014, China.
authors.forename: Hongbo
authors.initials: H
authors.lastname: Shao
authors.affiliation: State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, 71 East Beijing Road, Nanjing 210008, China. Electronic address: yhwu@issas.ac.cn.
authors.forename: Yonghong
authors.initials: Y
authors.lastname: Wu
mesh_terms: D018441:Biofilms; D011232:Chemical Precipitation; D004784:Environmental Monitoring; D005068:Eutrophication; D019015:Geologic Sediments / Q000737:chemistry*; D010758:Phosphorus / Q000737:chemistry*; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry
chemical_list: D014874:Water Pollutants, Chemical; D014867:Water; D010758:Phosphorus
keywords: Overlying water; Periphyton; Phosphorus; Precipitation; Sediment