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Internal phosphorus loading from sediments causes seasonal nitrogen limitation for harmful algal blooms.
Sci Total Environ. 2018 Jun 01; 625:872-884.ST

Abstract

It is proposed that the internal loading of phosphorus (P) from sediments plays an important role in seasonal nitrogen (N) limitation for harmful algal blooms (HABs), although there is a lack of experimental evidence. In this study, an eutrophic bay from the large and shallow Lake Taihu was studied for investigating the contribution of internal P to N limitation over one-year field sampling (February 2016 to January 2017). A prebloom-bloom period was identified from February to August according to the increase in Chla concentration in the water column, during which the ratio of total N to total P (TN/TP) exponentially decreased with month from 43.4 to 7.4. High-resolution dialysis (HR-Peeper) and diffusive gradients in thin films (DGT) analysis showed large variations in the vertical distribution of mobile P (SRP and DGT-labile P) in sediments, resulting in the SRP diffusion flux at the sediment-water interface ranging from -0.01 to 6.76mg/m2/d (minus sign denotes downward flux). Significant and linear correlations existed between SRP and soluble Fe(II) concentrations in pore water, reflecting that the spatial-temporal variation in mobile P was controlled by microbe-mediated Fe redox cycling. Mass estimation showed that the cumulative flux of SRP from sediments accounted for 54% of the increase in TP observed in the water column during the prebloom-bloom period. These findings are supported by the significantly negative correlation (p<0.01) observed between sediment SRP flux and water column TN/TP during the same period. Overall, these results provide solid evidence for the major role of internal P loading in causing N limitation during the prebloom-bloom period.

Authors+Show Affiliations

State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China. Electronic address: smding@niglas.ac.cn.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China.Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, China.GIS Centre, Ryan Institute and School of Geography and Archaeology, National University of Ireland, Galway, Ireland.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

29306830

Citation

Ding, Shiming, et al. "Internal Phosphorus Loading From Sediments Causes Seasonal Nitrogen Limitation for Harmful Algal Blooms." The Science of the Total Environment, vol. 625, 2018, pp. 872-884.
Ding S, Chen M, Gong M, et al. Internal phosphorus loading from sediments causes seasonal nitrogen limitation for harmful algal blooms. Sci Total Environ. 2018;625:872-884.
Ding, S., Chen, M., Gong, M., Fan, X., Qin, B., Xu, H., Gao, S., Jin, Z., Tsang, D. C. W., & Zhang, C. (2018). Internal phosphorus loading from sediments causes seasonal nitrogen limitation for harmful algal blooms. The Science of the Total Environment, 625, 872-884. https://doi.org/10.1016/j.scitotenv.2017.12.348
Ding S, et al. Internal Phosphorus Loading From Sediments Causes Seasonal Nitrogen Limitation for Harmful Algal Blooms. Sci Total Environ. 2018 Jun 1;625:872-884. PubMed PMID: 29306830.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Internal phosphorus loading from sediments causes seasonal nitrogen limitation for harmful algal blooms. AU - Ding,Shiming, AU - Chen,Musong, AU - Gong,Mengdan, AU - Fan,Xianfang, AU - Qin,Boqiang, AU - Xu,Hai, AU - Gao,ShuaiShuai, AU - Jin,Zengfeng, AU - Tsang,Daniel C W, AU - Zhang,Chaosheng, Y1 - 2018/01/04/ PY - 2017/11/04/received PY - 2017/12/31/revised PY - 2017/12/31/accepted PY - 2018/1/8/pubmed PY - 2018/10/12/medline PY - 2018/1/8/entrez KW - Eutrophication KW - Harmful algal blooms KW - High-resolution sampling KW - Iron redox cycle KW - Lake sediment KW - Mobile phosphorus SP - 872 EP - 884 JF - The Science of the total environment JO - Sci Total Environ VL - 625 N2 - It is proposed that the internal loading of phosphorus (P) from sediments plays an important role in seasonal nitrogen (N) limitation for harmful algal blooms (HABs), although there is a lack of experimental evidence. In this study, an eutrophic bay from the large and shallow Lake Taihu was studied for investigating the contribution of internal P to N limitation over one-year field sampling (February 2016 to January 2017). A prebloom-bloom period was identified from February to August according to the increase in Chla concentration in the water column, during which the ratio of total N to total P (TN/TP) exponentially decreased with month from 43.4 to 7.4. High-resolution dialysis (HR-Peeper) and diffusive gradients in thin films (DGT) analysis showed large variations in the vertical distribution of mobile P (SRP and DGT-labile P) in sediments, resulting in the SRP diffusion flux at the sediment-water interface ranging from -0.01 to 6.76mg/m2/d (minus sign denotes downward flux). Significant and linear correlations existed between SRP and soluble Fe(II) concentrations in pore water, reflecting that the spatial-temporal variation in mobile P was controlled by microbe-mediated Fe redox cycling. Mass estimation showed that the cumulative flux of SRP from sediments accounted for 54% of the increase in TP observed in the water column during the prebloom-bloom period. These findings are supported by the significantly negative correlation (p<0.01) observed between sediment SRP flux and water column TN/TP during the same period. Overall, these results provide solid evidence for the major role of internal P loading in causing N limitation during the prebloom-bloom period. SN - 1879-1026 UR - https://www.unboundmedicine.com/medline/citation/29306830/Internal_phosphorus_loading_from_sediments_causes_seasonal_nitrogen_limitation_for_harmful_algal_blooms_ DB - PRIME DP - Unbound Medicine ER -