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Water-level fluctuations regulate the availability and diffusion kinetics process of phosphorus at lake water-sediment interface.
Water Res. 2021 Jul 15; 200:117258.WR

Abstract

Sequential extraction and in-situ diffusive gradients in thin films (DGT) techniques were used to determine phosphorus (P) fractions and high-resolution 2D fluxes of labile PDGT, Fe2+DGT, and S2-DGT in sediment systems. The diffusion fluxes were subsequently calculated for different scenarios. Dynamic diffusion parameters between solid sediment and solution were also fitted using the DIFS (DGT-induced fluxes in sediments) model. The results suggested that Fe-bound P (Fe-P) was the dominant pool which contributed to the resupply potential of P in the water-sediment continuum. Significant upward decreases of labile PDGT, Fe2+DGT, and S2-DGT fluxes were detected in pristine and incubated microcosms. This dominance indicated the more obvious immobilization of labile P via oxidation of both Fe2+ and S2- in oxidic conditions. Additionally, these labile analytes in the microcosms obviously decreased after a 30-day incubation period, indicating that water-level fluctuations can significantly regulate adsorption-desorption processes of the P bound to Fe-containing minerals within a short time. Higher concentrations of labile PDGT, Fe2+DGT, and S2-DGT were measured at the shallow lake region where more drastic water-level variation occurred. This demonstrates that frequent adsorption-desorption of phosphate from the sediment particles to the aqueous solution can result in looser binding on the solid sediment surface and easier desorption in aerobic conditions via the regulation of water levels. Higher R values fitted with DIFS model suggested that more significant desorption and replenishment effect of labile P to the aqueous solution would occur in lake regions with more dramatic water-level variations. Finally, a significant positive correlation between S2-DGT and Fe2+DGT in the sediment indicated that the S2- oxidization under the conditions of low water-level can trigger the reduction of Fe(III) and subsequent release of active P. In general, speaking, frequent water-level fluctuations in the lake over time facilitated the formation and retention of the Fe(II) phase in the sediment, and desorption of Fe coupled P into the aqueous solution when the water level was high.

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.Nanjing Research Institute of Ecological and Environmental Sciences, Nanjing 210013, China.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.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.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.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.College of Geography and Environment, Shandong Normal University, Ji'nan 250359, China.Department of Soil Science, University of Wisconsin-Madison, 53706 Madison, Wisconsin, USA.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China. Electronic address: hbyin@niglas.ac.cn.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

34058482

Citation

Yuan, Hezhong, et al. "Water-level Fluctuations Regulate the Availability and Diffusion Kinetics Process of Phosphorus at Lake Water-sediment Interface." Water Research, vol. 200, 2021, p. 117258.
Yuan H, Wang H, Zhou Y, et al. Water-level fluctuations regulate the availability and diffusion kinetics process of phosphorus at lake water-sediment interface. Water Res. 2021;200:117258.
Yuan, H., Wang, H., Zhou, Y., Jia, B., Yu, J., Cai, Y., Yang, Z., Liu, E., Li, Q., & Yin, H. (2021). Water-level fluctuations regulate the availability and diffusion kinetics process of phosphorus at lake water-sediment interface. Water Research, 200, 117258. https://doi.org/10.1016/j.watres.2021.117258
Yuan H, et al. Water-level Fluctuations Regulate the Availability and Diffusion Kinetics Process of Phosphorus at Lake Water-sediment Interface. Water Res. 2021 Jul 15;200:117258. PubMed PMID: 34058482.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Water-level fluctuations regulate the availability and diffusion kinetics process of phosphorus at lake water-sediment interface. AU - Yuan,Hezhong, AU - Wang,Haixiang, AU - Zhou,Yanwen, AU - Jia,Bingchan, AU - Yu,Jianghua, AU - Cai,Yiwei, AU - Yang,Zhen, AU - Liu,Enfeng, AU - Li,Qiang, AU - Yin,Hongbin, Y1 - 2021/05/18/ PY - 2021/03/18/received PY - 2021/05/11/revised PY - 2021/05/12/accepted PY - 2021/6/1/pubmed PY - 2021/6/25/medline PY - 2021/5/31/entrez KW - High–resolution evidence KW - Lake KW - Phosphorus KW - Regulation effect KW - Water level fluctuation KW - Water–sediment interface SP - 117258 EP - 117258 JF - Water research JO - Water Res VL - 200 N2 - Sequential extraction and in-situ diffusive gradients in thin films (DGT) techniques were used to determine phosphorus (P) fractions and high-resolution 2D fluxes of labile PDGT, Fe2+DGT, and S2-DGT in sediment systems. The diffusion fluxes were subsequently calculated for different scenarios. Dynamic diffusion parameters between solid sediment and solution were also fitted using the DIFS (DGT-induced fluxes in sediments) model. The results suggested that Fe-bound P (Fe-P) was the dominant pool which contributed to the resupply potential of P in the water-sediment continuum. Significant upward decreases of labile PDGT, Fe2+DGT, and S2-DGT fluxes were detected in pristine and incubated microcosms. This dominance indicated the more obvious immobilization of labile P via oxidation of both Fe2+ and S2- in oxidic conditions. Additionally, these labile analytes in the microcosms obviously decreased after a 30-day incubation period, indicating that water-level fluctuations can significantly regulate adsorption-desorption processes of the P bound to Fe-containing minerals within a short time. Higher concentrations of labile PDGT, Fe2+DGT, and S2-DGT were measured at the shallow lake region where more drastic water-level variation occurred. This demonstrates that frequent adsorption-desorption of phosphate from the sediment particles to the aqueous solution can result in looser binding on the solid sediment surface and easier desorption in aerobic conditions via the regulation of water levels. Higher R values fitted with DIFS model suggested that more significant desorption and replenishment effect of labile P to the aqueous solution would occur in lake regions with more dramatic water-level variations. Finally, a significant positive correlation between S2-DGT and Fe2+DGT in the sediment indicated that the S2- oxidization under the conditions of low water-level can trigger the reduction of Fe(III) and subsequent release of active P. In general, speaking, frequent water-level fluctuations in the lake over time facilitated the formation and retention of the Fe(II) phase in the sediment, and desorption of Fe coupled P into the aqueous solution when the water level was high. SN - 1879-2448 UR - https://www.unboundmedicine.com/medline/citation/34058482/Water_level_fluctuations_regulate_the_availability_and_diffusion_kinetics_process_of_phosphorus_at_lake_water_sediment_interface_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0043-1354(21)00456-5 DB - PRIME DP - Unbound Medicine ER -