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Sediment internal nutrient loading in the most polluted area of a shallow eutrophic lake (Lake Chaohu, China) and its contribution to lake eutrophication.
Environ Pollut. 2020 Jul; 262:114292.EP

Abstract

It is well known that sediment internal loading can worsen lake water quality for many years even if effective measures have been taken to control external loading. In this study, a 12-month field study was carried out to reveal the relationship between sediment phosphorus (P) and nitrogen (N) forms as well as their fluxes across sediment-water interface from the most polluted area of Lake Chaohu, a large shallow eutrophication lake in China. The possible contribution of mobile fraction of P and N to lake eutrophication is also analyzed. The results indicate that the content of total P and N and their forms in water and sediment were rather dynamic during the year-long field investigation. Low concentrations of P and N from sediment and overlying water were observed in the winter but increased sharply in summer. The phosphate and ammonium fluxes showed evident seasonal variation, and higher fluxes can be observed in warmer seasons especially during the period of algal bloom with high sedimentation. The reduction of ferric iron and degradation of organic matter could be responsible for the increased P flux from sediment in algal bloom seasons, which is consistent with the seasonal variation of P forms in sediment. A comparison of the mole ratio of P flux:N flux to both the P:N mole ratio in sediments and the Redfield ratio was used to further distinguish the dominant sediment P forms' release during seasonal variation. Moreover, the anoxic condition and enhanced microbial activity in warmer seasons contribute a lot to the ammonium release from sediment. Consequently, the nutrient fluxes seasonally influence their corresponding nutrient concentrations in the overlying water. The results of this study indicate that sediment internal loading plays an important role in the eutrophication of Lake Chaohu.

Authors+Show Affiliations

State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, People's Republic of China; University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing, 100049, People's Republic of China.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, People's Republic of China.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, People's Republic of China.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, People's Republic of China. Electronic address: hbyin@niglas.ac.cn.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, People's Republic of China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

32179221

Citation

Yang, Chunhui, et al. "Sediment Internal Nutrient Loading in the Most Polluted Area of a Shallow Eutrophic Lake (Lake Chaohu, China) and Its Contribution to Lake Eutrophication." Environmental Pollution (Barking, Essex : 1987), vol. 262, 2020, p. 114292.
Yang C, Yang P, Geng J, et al. Sediment internal nutrient loading in the most polluted area of a shallow eutrophic lake (Lake Chaohu, China) and its contribution to lake eutrophication. Environ Pollut. 2020;262:114292.
Yang, C., Yang, P., Geng, J., Yin, H., & Chen, K. (2020). Sediment internal nutrient loading in the most polluted area of a shallow eutrophic lake (Lake Chaohu, China) and its contribution to lake eutrophication. Environmental Pollution (Barking, Essex : 1987), 262, 114292. https://doi.org/10.1016/j.envpol.2020.114292
Yang C, et al. Sediment Internal Nutrient Loading in the Most Polluted Area of a Shallow Eutrophic Lake (Lake Chaohu, China) and Its Contribution to Lake Eutrophication. Environ Pollut. 2020;262:114292. PubMed PMID: 32179221.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Sediment internal nutrient loading in the most polluted area of a shallow eutrophic lake (Lake Chaohu, China) and its contribution to lake eutrophication. AU - Yang,Chunhui, AU - Yang,Pan, AU - Geng,Jian, AU - Yin,Hongbin, AU - Chen,Kaining, Y1 - 2020/02/29/ PY - 2019/07/14/received PY - 2020/02/26/revised PY - 2020/02/28/accepted PY - 2020/3/18/pubmed PY - 2020/7/11/medline PY - 2020/3/18/entrez KW - Lake eutrophication KW - N and P fluxes KW - Phosphorus and nitrogen forms KW - Sediment internal loading SP - 114292 EP - 114292 JF - Environmental pollution (Barking, Essex : 1987) JO - Environ Pollut VL - 262 N2 - It is well known that sediment internal loading can worsen lake water quality for many years even if effective measures have been taken to control external loading. In this study, a 12-month field study was carried out to reveal the relationship between sediment phosphorus (P) and nitrogen (N) forms as well as their fluxes across sediment-water interface from the most polluted area of Lake Chaohu, a large shallow eutrophication lake in China. The possible contribution of mobile fraction of P and N to lake eutrophication is also analyzed. The results indicate that the content of total P and N and their forms in water and sediment were rather dynamic during the year-long field investigation. Low concentrations of P and N from sediment and overlying water were observed in the winter but increased sharply in summer. The phosphate and ammonium fluxes showed evident seasonal variation, and higher fluxes can be observed in warmer seasons especially during the period of algal bloom with high sedimentation. The reduction of ferric iron and degradation of organic matter could be responsible for the increased P flux from sediment in algal bloom seasons, which is consistent with the seasonal variation of P forms in sediment. A comparison of the mole ratio of P flux:N flux to both the P:N mole ratio in sediments and the Redfield ratio was used to further distinguish the dominant sediment P forms' release during seasonal variation. Moreover, the anoxic condition and enhanced microbial activity in warmer seasons contribute a lot to the ammonium release from sediment. Consequently, the nutrient fluxes seasonally influence their corresponding nutrient concentrations in the overlying water. The results of this study indicate that sediment internal loading plays an important role in the eutrophication of Lake Chaohu. SN - 1873-6424 UR - https://www.unboundmedicine.com/medline/citation/32179221/Sediment_internal_nutrient_loading_in_the_most_polluted_area_of_a_shallow_eutrophic_lake__Lake_Chaohu_China__and_its_contribution_to_lake_eutrophication_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0269-7491(19)33815-1 DB - PRIME DP - Unbound Medicine ER -