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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

作者： Liu, Wei 1 ; Hu, Fang 2 ; Fu, Songjie 2 ; Liu, Zhenjun 4 ; Yu, Yongchao 2 ; Jiang, Shan 2 ; Liang, Lanwei 2 ; Chen, Xuemei 2 ; Jiao, Yang 2 ; Gu, Sen 2 ; Li, Qingman 2 ;

作者机构： 1.Hubei Acad Agr Sci, Inst Plant Protect & Soil Fertilizer, Natl Agr Expt Hongshan Stn Soil Qual, Wuhan 430064, Peoples R China

2.Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China

3.China Univ Geosci, Sch Environm Studies, Wuhan 430074, Peoples R China

4.Weifang Xiashan Reservoir Management Serv Ctr, Weifang 261325, Shandong, Peoples R China

5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

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

页码：

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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