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Characterization and source identification of organic phosphorus in sediments of a hypereutrophic lake.
Environ Pollut. 2020 Feb; 257:113500.EP

Abstract

High phosphorus (P) load and consequent algal bloom are critical issues because of their harmful effects to aquatic ecosystems. The organic phosphorus (Po) cycling and hydrolyzation pathway in the sediments of a hypereutrophic lake area with high algae biomass were investigated using stable isotopes (δ13C and δ15N) along with C/N ratios, a sequential extraction procedure, 31P NMR spectrum, and alkaline phosphatase activity (APA) was measured simultaneously. C/N ratios lower than 10 combined with lighter δ13C (-23.5 to -25.2‰) and δ15N values (3.7-9.5‰) indicated that endogenous algal debris contributed to the predominant proportions of P-containing organic matter in the sediments. Sequential extraction results showed that Po fractions decreased as nonlabile Po > moderately labile Po > biomass-Po. Decreasing humic-associated Po (HA-Po) in sediments downward suggested the degradation of high-molecular-weight Po compounds on the geological time scale to low-molecular-weight Po including fulvic-associated Po (FA-Po), which is an important source of labile Po in the sediment. An analysis of the solution 31P NMR spectrum analysis showed that important Po compound groups decreased in the order of orthophosphate monoesters > DNA-Po > phospholipids. The significant correlation indicated that orthophosphate monoesters were the predominant components of HA-Po. Rapid hydrolysis of labile orthophosphate diesters further facilitated the accumulation of orthophosphate monoesters in the sediments. Additionally, the simultaneously upward increasing trend demonstrated that APA accelerated the mineralization of Po into dissolved reactive phosphorus (DRP), which might feed back to eutrophication in algae-dominant lakes. The significantly low half-life time (T1/2) for important Po compound groups indicated faster metabolism processes, including hydrolysis and mineralization, in hypereutrophic lakes with high algae biomass. These findings provided improved insights for better understanding of the origin and cycling processes as well as management of Po in hypereutrophic lakes.

Authors+Show Affiliations

Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control and Collaborative Innovation Center of Atmospheric Environment and Equipment Technology (CICAEET), School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China. Electronic address: yuanhezhong@nuist.edu.cn.Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control and Collaborative Innovation Center of Atmospheric Environment and Equipment Technology (CICAEET), School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China.Department of Plant and Soil Sciences, University of Delaware, Newark, DE, 19716, United States.Testing Center, Yangzhou University, Yangzhou 225009, China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31733975

Citation

Yuan, Hezhong, et al. "Characterization and Source Identification of Organic Phosphorus in Sediments of a Hypereutrophic Lake." Environmental Pollution (Barking, Essex : 1987), vol. 257, 2020, p. 113500.
Yuan H, Tai Z, Li Q, et al. Characterization and source identification of organic phosphorus in sediments of a hypereutrophic lake. Environ Pollut. 2020;257:113500.
Yuan, H., Tai, Z., Li, Q., & Zhang, F. (2020). Characterization and source identification of organic phosphorus in sediments of a hypereutrophic lake. Environmental Pollution (Barking, Essex : 1987), 257, 113500. https://doi.org/10.1016/j.envpol.2019.113500
Yuan H, et al. Characterization and Source Identification of Organic Phosphorus in Sediments of a Hypereutrophic Lake. Environ Pollut. 2020;257:113500. PubMed PMID: 31733975.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Characterization and source identification of organic phosphorus in sediments of a hypereutrophic lake. AU - Yuan,Hezhong, AU - Tai,Ziqiu, AU - Li,Qiang, AU - Zhang,Fengmin, Y1 - 2019/10/31/ PY - 2019/05/19/received PY - 2019/10/17/revised PY - 2019/10/26/accepted PY - 2019/11/18/pubmed PY - 2020/3/11/medline PY - 2019/11/18/entrez KW - Alkaline phosphatase activity (APA) KW - Hypereutrophic lake KW - Organic phosphorus KW - Sediment KW - Solution (31)P NMR KW - Source identification SP - 113500 EP - 113500 JF - Environmental pollution (Barking, Essex : 1987) JO - Environ Pollut VL - 257 N2 - High phosphorus (P) load and consequent algal bloom are critical issues because of their harmful effects to aquatic ecosystems. The organic phosphorus (Po) cycling and hydrolyzation pathway in the sediments of a hypereutrophic lake area with high algae biomass were investigated using stable isotopes (δ13C and δ15N) along with C/N ratios, a sequential extraction procedure, 31P NMR spectrum, and alkaline phosphatase activity (APA) was measured simultaneously. C/N ratios lower than 10 combined with lighter δ13C (-23.5 to -25.2‰) and δ15N values (3.7-9.5‰) indicated that endogenous algal debris contributed to the predominant proportions of P-containing organic matter in the sediments. Sequential extraction results showed that Po fractions decreased as nonlabile Po > moderately labile Po > biomass-Po. Decreasing humic-associated Po (HA-Po) in sediments downward suggested the degradation of high-molecular-weight Po compounds on the geological time scale to low-molecular-weight Po including fulvic-associated Po (FA-Po), which is an important source of labile Po in the sediment. An analysis of the solution 31P NMR spectrum analysis showed that important Po compound groups decreased in the order of orthophosphate monoesters > DNA-Po > phospholipids. The significant correlation indicated that orthophosphate monoesters were the predominant components of HA-Po. Rapid hydrolysis of labile orthophosphate diesters further facilitated the accumulation of orthophosphate monoesters in the sediments. Additionally, the simultaneously upward increasing trend demonstrated that APA accelerated the mineralization of Po into dissolved reactive phosphorus (DRP), which might feed back to eutrophication in algae-dominant lakes. The significantly low half-life time (T1/2) for important Po compound groups indicated faster metabolism processes, including hydrolysis and mineralization, in hypereutrophic lakes with high algae biomass. These findings provided improved insights for better understanding of the origin and cycling processes as well as management of Po in hypereutrophic lakes. SN - 1873-6424 UR - https://www.unboundmedicine.com/medline/citation/31733975/Characterization_and_source_identification_of_organic_phosphorus_in_sediments_of_a_hypereutrophic_lake_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0269-7491(19)32663-6 DB - PRIME DP - Unbound Medicine ER -