title: Effects of seasonal hypoxia on the release of phosphorus from sediments in deep-water ecosystem: A case study in Hongfeng Reservoir, Southwest China.
abstract: Using the diffusive gradients in thin films (DGT) technique and microelectrode technique, hypoxia and its effects on the release of phosphorus (P) from sediments were carefully investigated in Hongfeng Reservoir, a typical deep-water ecosystem where eutrophication and hypoxia is still an environmental challenge in Southwest China. The results suggested that hypoxia significantly promotes the release of P from sediments and the release of P under hypoxic condition mostly comes from the release of BD-P. Together with the in-situ and high resolution evidences from DGT and microelectrode, the release of P from sediments under hypoxic condition was assumed to be coupled processes which are associated with the combined cycles of "P-Fe-S". Evidences from the present work implied that the internal P-loadings induced by hypoxia, especially after a reduction of external P-loading, should be paid more attention in eutrophic deep-water reservoirs, Southwest China.
authors.affiliation: State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, PR China.
authors.forename: Jingfu
authors.initials: J
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, PR China. Electronic address: chenjingan@vip.skleg.cn.
authors.forename: Jingan
authors.initials: J
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, PR China.
authors.forename: Shiming
authors.initials: S
authors.lastname: Ding
authors.affiliation: State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, PR China.
authors.forename: Jianyang
authors.initials: J
authors.lastname: Guo
authors.affiliation: Hydronumerics, Level 1 272 Lygon St, Carlton, Vic 3053, Australia.
authors.forename: Dallimore
authors.initials: D
authors.lastname: Christopher
authors.affiliation: State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, PR China.
authors.forename: Zhihui
authors.initials: Z
authors.lastname: Dai
authors.affiliation: State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, PR China.
authors.forename: Haiquan
authors.initials: H
authors.lastname: Yang
mesh_terms: D059001:Aquatic Organisms / Q000378:metabolism; D002681:China; D004784:Environmental Monitoring; D005068:Eutrophication; D019015:Geologic Sediments / Q000737:chemistry*; D000860:Hypoxia; D010758:Phosphorus / Q000032:analysis*; D012621:Seasons; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D014874:Water Pollutants, Chemical; D014867:Water; D010758:Phosphorus
keywords: Diffusive gradients in thin films technique; Hypoxia; Microelectrode; Phosphorus