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Release characteristics and mechanisms of sediment phosphorus in contaminated and uncontaminated rivers: A case study in South China.
Environ Pollut. 2021 Jan 01; 268(Pt A):115749.EP

Abstract

Phosphorus (P) cycling present in sediments associated with iron (Fe), manganese (Mn) and sulfur (S) geochemical processes may cause secondary pollution in overlying water. Understanding the mechanisms of P release from sediments should help to restore water quality. This study used the diffusive gradients in thin film (DGT) technique to investigate the seasonal variation in the lability, remobilization mechanisms, and release characteristics of sediment P in the uncontaminated Xizhi River and the severely contaminated Danshui River, South China. P accumulation in sediments contributed to higher DGT-labile P concentrations in contaminated reaches, and the highest labile P concentrations were generally observed in summer season at each site. The significant positive relationships (p < 0.05) between labile Fe and P confirmed the Fe-P coupling release mechanism in uncontaminated sediments. Stronger relationships between labile Mn and P at contaminated sites indicated that Mn oxides played an important role in P remobilization. However, sulfate reduction associated with microbial activities (crucial genera: Desulfobulbus, Desulfomicrobium and Desulforhabdus) was considered to decouple the Fe & Mn-P cycling relationship, promoting P release at contaminated sites. The effluxes of sediment P were much higher in the Danshui River (mean 0.132 mg cm-2·d-1) than in the Xizhi River (mean 0.038 mg cm-2·d-1). And hot season led to growth in P effluxes that was much greater in contaminated river.

Authors+Show Affiliations

School of Geography and Planning, Sun Yat-sen University, Guangzhou, 510275, China.School of Geography and Planning, Sun Yat-sen University, Guangzhou, 510275, China. Electronic address: nvtoo@sina.com.School of Geography and Planning, Sun Yat-sen University, Guangzhou, 510275, China.School of Geography and Planning, Sun Yat-sen University, Guangzhou, 510275, China.College of Ecology and Environment, Southwest Forestry University, Kunming, 650224, China.School of Geography and Planning, Sun Yat-sen University, Guangzhou, 510275, China.School of Geography and Planning, Sun Yat-sen University, Guangzhou, 510275, China. Electronic address: chenjyao@mail.sysu.edu.cn.School of Geography and Planning, Sun Yat-sen University, Guangzhou, 510275, China.School of Geography and Planning, Sun Yat-sen University, Guangzhou, 510275, China.School of Geography and Planning, Sun Yat-sen University, Guangzhou, 510275, China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

33120335

Citation

Li, Rui, et al. "Release Characteristics and Mechanisms of Sediment Phosphorus in Contaminated and Uncontaminated Rivers: a Case Study in South China." Environmental Pollution (Barking, Essex : 1987), vol. 268, no. Pt A, 2021, p. 115749.
Li R, Gao L, Wu Q, et al. Release characteristics and mechanisms of sediment phosphorus in contaminated and uncontaminated rivers: A case study in South China. Environ Pollut. 2021;268(Pt A):115749.
Li, R., Gao, L., Wu, Q., Liang, Z., Hou, L., Yang, Z., Chen, J., Jiang, T., Zhu, A., & Li, M. (2021). Release characteristics and mechanisms of sediment phosphorus in contaminated and uncontaminated rivers: A case study in South China. Environmental Pollution (Barking, Essex : 1987), 268(Pt A), 115749. https://doi.org/10.1016/j.envpol.2020.115749
Li R, et al. Release Characteristics and Mechanisms of Sediment Phosphorus in Contaminated and Uncontaminated Rivers: a Case Study in South China. Environ Pollut. 2021 Jan 1;268(Pt A):115749. PubMed PMID: 33120335.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Release characteristics and mechanisms of sediment phosphorus in contaminated and uncontaminated rivers: A case study in South China. AU - Li,Rui, AU - Gao,Lei, AU - Wu,Qirui, AU - Liang,Zuobing, AU - Hou,Lei, AU - Yang,Zhigang, AU - Chen,Jianyao, AU - Jiang,Tao, AU - Zhu,Aiping, AU - Li,Manzi, Y1 - 2020/10/11/ PY - 2020/07/22/received PY - 2020/09/22/revised PY - 2020/09/24/accepted PY - 2020/10/30/pubmed PY - 2020/12/19/medline PY - 2020/10/29/entrez KW - Diffusive flux KW - Diffusive gradients in thin film KW - Fe & Mn–P coupling KW - P legacy KW - Sediment KW - Sulfate reduction SP - 115749 EP - 115749 JF - Environmental pollution (Barking, Essex : 1987) JO - Environ Pollut VL - 268 IS - Pt A N2 - Phosphorus (P) cycling present in sediments associated with iron (Fe), manganese (Mn) and sulfur (S) geochemical processes may cause secondary pollution in overlying water. Understanding the mechanisms of P release from sediments should help to restore water quality. This study used the diffusive gradients in thin film (DGT) technique to investigate the seasonal variation in the lability, remobilization mechanisms, and release characteristics of sediment P in the uncontaminated Xizhi River and the severely contaminated Danshui River, South China. P accumulation in sediments contributed to higher DGT-labile P concentrations in contaminated reaches, and the highest labile P concentrations were generally observed in summer season at each site. The significant positive relationships (p < 0.05) between labile Fe and P confirmed the Fe-P coupling release mechanism in uncontaminated sediments. Stronger relationships between labile Mn and P at contaminated sites indicated that Mn oxides played an important role in P remobilization. However, sulfate reduction associated with microbial activities (crucial genera: Desulfobulbus, Desulfomicrobium and Desulforhabdus) was considered to decouple the Fe & Mn-P cycling relationship, promoting P release at contaminated sites. The effluxes of sediment P were much higher in the Danshui River (mean 0.132 mg cm-2·d-1) than in the Xizhi River (mean 0.038 mg cm-2·d-1). And hot season led to growth in P effluxes that was much greater in contaminated river. SN - 1873-6424 UR - https://www.unboundmedicine.com/medline/citation/33120335/Release_characteristics_and_mechanisms_of_sediment_phosphorus_in_contaminated_and_uncontaminated_rivers:_A_case_study_in_South_China_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0269-7491(20)36438-1 DB - PRIME DP - Unbound Medicine ER -