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The biotransformation of soil phosphorus in the water level fluctuation zone could increase eutrophication in reservoirs.
Sci Total Environ. 2021 Apr 01; 763:142976.ST

Abstract

The massive amounts of phosphorus (P) entering into rivers and reservoirs may induce eutrophication. However, the link between the transport and transformation of soil P and the dynamics of P availability in reservoir regions are not well demonstrated. The present study selected the Pengxi River suffering the anti-seasonal water level fluctuation of the Three Gorgers Reservoir as the study area. Soil nutrients along the longitudinal and lateral gradients of the Pengxi River were investigated to illustrate the spatial distribution patterns, analyzed by the Hedley extraction schemes. The effects of biotic and abiotic factors on soil P transformation and the dynamics of bioavailable P were evaluated via determinations of enzymatic hydrolysis phosphorus (EHP) with and without ultraviolet (UV) irradiation. The results indicated that soil nutrients varied significantly between the water level fluctuation zone (WLFZ) and upland along the river longitudinal gradients, where the trends of the extracted OP were the same in H2O, NaHCO3 and NaOH extractions. The EHP accounted for 33.67 ± 15.87% of the total extracted OP, of which Monoester P, Phytate-like P and NHOP were determined at all extracts but Diester P was mainly found at H2O and NaOH extracts. UV irradiation significantly increased P bioavailability up to 24.44%. These results could demonstrate the mechanism of soil P transformation via UV irradiation and enzymatic hydrolysis. Therefore, the bioavailable P enters the water body during the submergence period may lead to eutrophication in the Pengxi River, which could pose a risk to the reservoir ecosystem.

Authors+Show Affiliations

Key Laboratory of the Three Gorges Reservoir Region's Eco-environment, Ministry of Education, Chongqing University, Chongqing 400045, China.Key Laboratory of the Three Gorges Reservoir Region's Eco-environment, Ministry of Education, Chongqing University, Chongqing 400045, China.Key Laboratory of the Three Gorges Reservoir Region's Eco-environment, Ministry of Education, Chongqing University, Chongqing 400045, China.Key Laboratory of the Three Gorges Reservoir Region's Eco-environment, Ministry of Education, Chongqing University, Chongqing 400045, China.Key Laboratory of the Three Gorges Reservoir Region's Eco-environment, Ministry of Education, Chongqing University, Chongqing 400045, China.Key Laboratory of the Three Gorges Reservoir Region's Eco-environment, Ministry of Education, Chongqing University, Chongqing 400045, China. Electronic address: guo0768@cqu.edu.cn.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

33139007

Citation

Chen, Zhongli, et al. "The Biotransformation of Soil Phosphorus in the Water Level Fluctuation Zone Could Increase Eutrophication in Reservoirs." The Science of the Total Environment, vol. 763, 2021, p. 142976.
Chen Z, Fang F, Shao Y, et al. The biotransformation of soil phosphorus in the water level fluctuation zone could increase eutrophication in reservoirs. Sci Total Environ. 2021;763:142976.
Chen, Z., Fang, F., Shao, Y., Jiang, Y., Huang, J., & Guo, J. (2021). The biotransformation of soil phosphorus in the water level fluctuation zone could increase eutrophication in reservoirs. The Science of the Total Environment, 763, 142976. https://doi.org/10.1016/j.scitotenv.2020.142976
Chen Z, et al. The Biotransformation of Soil Phosphorus in the Water Level Fluctuation Zone Could Increase Eutrophication in Reservoirs. Sci Total Environ. 2021 Apr 1;763:142976. PubMed PMID: 33139007.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The biotransformation of soil phosphorus in the water level fluctuation zone could increase eutrophication in reservoirs. AU - Chen,Zhongli, AU - Fang,Fang, AU - Shao,Ying, AU - Jiang,Yanxue, AU - Huang,Junjie, AU - Guo,Jinsong, Y1 - 2020/10/22/ PY - 2020/07/10/received PY - 2020/09/27/revised PY - 2020/10/05/accepted PY - 2020/11/4/pubmed PY - 2021/1/26/medline PY - 2020/11/3/entrez KW - Bioavailability KW - Enzymatic hydrolysis KW - Eutrophication KW - Soil organic phosphorus KW - Transport and transformation KW - Ultraviolet (UV) irradiation SP - 142976 EP - 142976 JF - The Science of the total environment JO - Sci Total Environ VL - 763 N2 - The massive amounts of phosphorus (P) entering into rivers and reservoirs may induce eutrophication. However, the link between the transport and transformation of soil P and the dynamics of P availability in reservoir regions are not well demonstrated. The present study selected the Pengxi River suffering the anti-seasonal water level fluctuation of the Three Gorgers Reservoir as the study area. Soil nutrients along the longitudinal and lateral gradients of the Pengxi River were investigated to illustrate the spatial distribution patterns, analyzed by the Hedley extraction schemes. The effects of biotic and abiotic factors on soil P transformation and the dynamics of bioavailable P were evaluated via determinations of enzymatic hydrolysis phosphorus (EHP) with and without ultraviolet (UV) irradiation. The results indicated that soil nutrients varied significantly between the water level fluctuation zone (WLFZ) and upland along the river longitudinal gradients, where the trends of the extracted OP were the same in H2O, NaHCO3 and NaOH extractions. The EHP accounted for 33.67 ± 15.87% of the total extracted OP, of which Monoester P, Phytate-like P and NHOP were determined at all extracts but Diester P was mainly found at H2O and NaOH extracts. UV irradiation significantly increased P bioavailability up to 24.44%. These results could demonstrate the mechanism of soil P transformation via UV irradiation and enzymatic hydrolysis. Therefore, the bioavailable P enters the water body during the submergence period may lead to eutrophication in the Pengxi River, which could pose a risk to the reservoir ecosystem. SN - 1879-1026 UR - https://www.unboundmedicine.com/medline/citation/33139007/The_biotransformation_of_soil_phosphorus_in_the_water_level_fluctuation_zone_could_increase_eutrophication_in_reservoirs_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0048-9697(20)36506-2 DB - PRIME DP - Unbound Medicine ER -