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- W2092115228 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." @default.
- W2092115228 created "2016-06-24" @default.
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- W2092115228 date "2013-02-01" @default.
- W2092115228 modified "2023-10-18" @default.
- W2092115228 title "Phosphorus partitioning between sediment and water in the riparian wetland in response to the hydrological regimes" @default.
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- W2092115228 doi "https://doi.org/10.1016/j.chemosphere.2012.10.093" @default.
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