Phosphorus Fractions in the Sediments of Yuecheng Reservoir, China

Abstract

As a result of the inexorable development of the economy and the ever-increasing population, the demand for water in the urban and rural sectors has increased, and this in turn has caused the water quality and eutrophication of the reservoir to become a legitimate concern in the water environment management of river basins. Phosphorus (P) is one of the limiting nutrients in aquatic ecosystems; P in the sediment is a primary factor for eutrophication. Yuecheng Reservoir is located in one of the most productive and intensively cultivated agricultural regions in North China. Detailed knowledge of the sediment is lacking at this regional reservoir. The first study to look into the different P fractions and its diffusion fluxes at the water sediment interface of the Yuecheng Reservoir makes it possible to learn about the internal P loading. According to the results, the concentrations of total phosphorus (TP) ranged from 1576.3 to 2172.6 mg kg and the P fraction concentration sequence is as follows: P associated with calcium (Ca–Pi) > organic P (Po) > P bound to aluminum (Al), ferrum (Fe) and manganese (Mn) oxides and hydroxides (Fe/Al–Pi). The results demonstrated that, although the construction of a large number of water conservancy projects in the upper reaches of the river resulted in the decrease of inflow runoff, the pollutions from terrestrial plants or materials played a key role in the sediment phosphorus fraction, and they should be emphasized on the water environment management of river basin.

Lake and River Restoration: Method, Evaluation and Management

“…Dang et al [13] investigated the phosphorus (P) fractions and the relationships between environmental factors of a field reservoir, a main local water supply source of the municipal, industry and agricultural sectors. Their research aims to enhance the knowledge of P cycling in a high P concentration basin, so that water quality and trophic status can be better controlled in the future.…”

Water Quality Variation Law and Prediction Method of a Small Reservoir in China

“…Exogenous pollutants mainly include the nitrogen and phosphorus content contained in the incoming flow of lakes and reservoirs [7]. Endogenous phosphorus and nitrogen are usually released into lakes through the diffusion process or after the sediment is disturbed [8]. For some shallow lakes, the impact of wind speed on lake hydrodynamic forces can promote the disturbance of sediment and release nitrogen and phosphorus [9,10].…”