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10.3390/w14040664
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Article

Evaluation of the Potential Release Risk of Internal N and P from Sediments—A Preliminary Study in Two Freshwater Reservoirs in South China

by
Peng Cheng
1,2,
Xu Bao
2,3,
Yang Jiao
2,
Xuezhi Zhang
2,
Qingman Li
2,* and
Sen Gu
2,*
1
College of Fisheries and Life Sciences, Dalian Ocean University, Dalian 116023, China
2
Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
3
University of Chinese Academy of Sciences, Beijing 100049, China
*
Authors to whom correspondence should be addressed.
Water 2022, 14(4), 664; https://doi.org/10.3390/w14040664
Submission received: 24 December 2021 / Revised: 11 February 2022 / Accepted: 18 February 2022 / Published: 21 February 2022
(This article belongs to the Special Issue Nutrient Biogeochemical Cycles in Eutrophic Inland Waters and Eutrophication Control)
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Abstract

Growing evidence has demonstrated the influence of internal nitrogen (N) and phosphorus (P) on harmful algae blooms in eutrophic freshwater ecosystems. However, the main controlling factors for internal N and P release risks, and whether these factors vary as environmental conditions change, remains poorly understood. We evaluated potential release risks of N and P from sediments in two freshwater reservoirs in Beihai City, southern China, by evaluating apparent nutrient fluxes during simulated static incubation experiments at two temperatures (15 °C and 25 °C). Sediments were analyzed to determine their basic properties as well as N and P fractions. Results showed that the main controlling factors of the apparent fluxes in dissolved total P, soluble reactive P, total N, and ammonium were related to sediment adsorption properties, redox properties, and microbial-mediated properties (e.g., water-extractable P, total inorganic N, redox-sensitive P, total organic carbon, organic P). The primary controlling factors for apparent N and P fluxes were dependent on the form of N and P and changed with temperature. The results suggest that care should be taken when simply using total N and P contents in sediments to evaluate their internal nutrient release risks.
Keywords: internal nutrient release; nitrogen; phosphorus; sediment; freshwater reservoir; eutrophication internal nutrient release; nitrogen; phosphorus; sediment; freshwater reservoir; eutrophication
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MDPI and ACS Style

Cheng, P.; Bao, X.; Jiao, Y.; Zhang, X.; Li, Q.; Gu, S. Evaluation of the Potential Release Risk of Internal N and P from Sediments—A Preliminary Study in Two Freshwater Reservoirs in South China. Water 2022, 14, 664. https://doi.org/10.3390/w14040664

AMA Style

Cheng P, Bao X, Jiao Y, Zhang X, Li Q, Gu S. Evaluation of the Potential Release Risk of Internal N and P from Sediments—A Preliminary Study in Two Freshwater Reservoirs in South China. Water. 2022; 14(4):664. https://doi.org/10.3390/w14040664

Chicago/Turabian Style

Cheng, Peng, Xu Bao, Yang Jiao, Xuezhi Zhang, Qingman Li, and Sen Gu. 2022. "Evaluation of the Potential Release Risk of Internal N and P from Sediments—A Preliminary Study in Two Freshwater Reservoirs in South China" Water 14, no. 4: 664. https://doi.org/10.3390/w14040664

APA Style

Cheng, P., Bao, X., Jiao, Y., Zhang, X., Li, Q., & Gu, S. (2022). Evaluation of the Potential Release Risk of Internal N and P from Sediments—A Preliminary Study in Two Freshwater Reservoirs in South China. Water, 14(4), 664. https://doi.org/10.3390/w14040664

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