Prediction of Three Sediment Phosphorus Indexes on Water Column Phosphorus Across Seasons in the Xiashan Reservoir, Northern China

文献类型： 外文期刊

第一作者： Liu, Wei

作者： Liu, Wei;Hu, Fang;Fu, Songjie;Yu, Yongchao;Jiang, Shan;Liang, Lanwei;Chen, Xuemei;Jiao, Yang;Gu, Sen;Li, Qingman;Hu, Fang;Fu, Songjie;Yu, Yongchao;Jiang, Shan;Liang, Lanwei;Liu, Zhenjun;Chen, Xuemei;Jiao, Yang;Gu, Sen;Li, Qingman

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关键词： sediment; phosphorus; internal loading; freshwater reservoir; risk assessment; eutrophication

期刊名称：WATER （ 影响因子：3.0； 五年影响因子：3.3 ）

ISSN：

年卷期： 2025 年 17 卷 2 期

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收录情况： SCI

摘要： Internal phosphorus (P) loading is a key driver of waterbody eutrophication. Various sediment P indexes are developed to assess sediment P risks by linking them to water column P, but their seasonal reliability remains underexplored. This study evaluated, for the first time, sediment P status in the Xiashan reservoir, a large shallow reservoir in northern China serving 9.4 million people. The ability of three P indexes, including exchangeable P (Ex-P), Olsen P (Olsen-P), and diluted HCl-extractable P (HCl-P), to predict water column P concentrations was tested across February, May, and August. Sediments in the Xiashan reservoir exhibited moderate total P levels (531-650 mg kg-1) but high P availability, with Ex-P, Olsen-P, and HCl-P in ranges of 19-35, 58-101, and 327-444 mg kg-1, respectively, likely due to sandy composition. Water column P concentrations significantly correlate with August sediment P indexes (r = 0.42-0.81) but not with February and May sediments, highlighting the ability of August sediment P indexes to predict water column P across seasons. Sampling in August is recommended to efficiently identify critical zones for internal P loading, with Ex-P as the preferred indicator given its simple extraction and strong correlation with water column P (r = 0.81).

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