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首页> 外文期刊>Environmental engineering science >Phosphorus and Its Release from Sediments in an Agricultural Reservoir in Neijiang City, China
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Phosphorus and Its Release from Sediments in an Agricultural Reservoir in Neijiang City, China

机译：Phosphorus and Its Release from Sediments in an Agricultural Reservoir in Neijiang City, China

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Sediments play an important role in regulating the phosphorus concentration of the overlying water, especiallyfor the agricultural reservoirs with the persistent input of external phosphorus by agricultural activities.Therefore, the sediment can significantly affect the process of reservoirs’ eutrophication. In this study, anagricultural reservoir (Huanghezhen Reservoir) in Neijiang City, southeast of Sichuan Basin, China, wasconducted to investigate the phosphorus fraction, adsorption, and release characteristics in sediments throughfield investigation and experimental studies. Results revealed significant enrichment of phosphorus in reservoirsediments, especially in the upstream and midstream, the sediment P contents vastly exceed the stander ofheavy pollution (>650 mg/kg). Inorganic phosphorus accounted for 64.5 to 93.2 of total phosphorus, andcalcium-bound phosphorus was the most significant fraction of Inorganic phosphorus, while the content of Fe/Al-bound phosphorus is fewer in a ratio of 3.5 to 32.4. The results of the adsorption–desorption ofphosphorus indicated that the adsorption capacity in sediments was weak, the phosphorus from agriculturalactivities was less adsorbed after entering the reservoir, and the sediment was a source of phosphorus in theHuanghezhen Reservoir. In addition, the content of released phosphorus in sediments positively agrees with theconcentration of Fe/Al-bound phosphorus, showing that Fe/Al-bound phosphorus plays an effective indicator inthe sediment phosphorus release potential. Moreover, the high water temperature and reduced environmentwould promote the release of sediment phosphorus. This study provided findings regarding sediment phosphorusfractions and adsorption–release characteristics, showing that the sediment phosphorus fractions, regionalclimate, and hydrogeological conditions should be comprehensively considered in establishing effectivemeasures of prevention and controlling of eutrophication in agricultural reservoirs.

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