title: Phosphorus partitioning between sediment and water in the riparian wetland in response to the hydrological regimes.
abstract: Water quality in watersheds is severely impacted by nutrient enrichment as a result of agricultural activities. Understanding hydrological effects on P dynamics can optimize the ecological function of riparian wetlands to reduce nonpoint source pollution. The XiaZhuHu wetlands were selected for field P investigation, and two typical hydrological batch studies of 35 d each (a static column observation simulating the dry season, and a steady-flow flume observation simulating the rainy season) were conducted to understand sediment P dynamics and evaluate capacity of P immobilization. The average equilibrium P concentration of 0.02 mg L(-1) among the 31 sampled sediments was generally lower than the average dissolved reactive P concentrations in the overlying water, indicating an ecological role as a P sink. In static simulation observation, there was a fast-pace sorption process during the first 3d followed by a slower paced process, and the mass of P adsorbed per unit sediment surface (MPAS) reached 0.16 mg cm(-2). The temporal curves of P equilibrium between flowthrough water and top sediment (5 cm) were characterized as a quasi "V"-pattern, and the MPAS ranged from -0.04 to 0.46 mg cm(-2) during the steady-flow observation. The newly-trapped P was mainly found in Al-bound P and subsequently as Fe-bound P, which would be helpful for sediment P immobilization. Based on our findings, the sediment of the tested wetlands could retain external P from agricultural land by as much as 10-30 times the area of itself, which accounts for approximately 3.3-10% of the watershed area.
authors.affiliation: State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.
authors.forename: ZhaoDe
authors.initials: Z
authors.lastname: Wang
authors.forename: Shuai
authors.initials: S
authors.lastname: Li
authors.forename: Jun
authors.initials: J
authors.lastname: Zhu
authors.forename: ZhiJian
authors.initials: Z
authors.lastname: Zhang
mesh_terms: D004784:Environmental Monitoring; D052918:Environmental Restoration and Remediation / Q000379:methods; D005618:Fresh Water / Q000737:chemistry*; D019015:Geologic Sediments / Q000737:chemistry*; D010758:Phosphorus / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014877:Water Pollution, Chemical / Q000706:statistics & numerical data; D053833:Wetlands
chemical_list: D014874:Water Pollutants, Chemical; D010758:Phosphorus