| Title: | Eutrophication levels increase sulfur biotransformation and emissions from sediments of Lake Taihu |
| Author(s): | Wang J; Wei ZP; Chu YX; Tian G; He R; |
| Address: | "Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China; Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China. Hohai University, State Key Laboratory Hydrology-Water Resources and Hydraulic Engineering, Nanjing 210098, China. Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China; School of Civil Engineering and Architecture, Zhejiang University of Science and Technology, Hangzhou 310023, China. Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China. Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China; Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China. Electronic address: heruo@zju.edu.cn" |
| DOI: | 10.1016/j.scitotenv.2023.164054 |
| ISSN/ISBN: | 1879-1026 (Electronic) 0048-9697 (Linking) |
| Abstract: | "Eutrophication can stimulate the emissions of volatile sulfur compounds (VSCs) accompanied by variations in environmental variables in lakes. However, the effects of eutrophication on VSC emissions from lake sediments as well as the underlying mechanisms remain unclear. In this study, depth gradient sediments at different eutrophication levels and seasons were collected from Lake Taihu to investigate the response of sulfur biotransformation in the sediments to eutrophication based on the analysis of environmental variables, microbial activity, abundance and community structure. H(2)S and CS(2) were the main VSCs produced from the lake sediments, with the production rates of 2.3-7.9 and 1.2-3.9 ng g(-1) h(-1) in August, respectively, which were higher than those in March, mainly due to the increasing activity and abundance of sulfate-reducing bacteria (SRB) at high temperatures. The VSC production rates from the sediments increased with lake eutrophication level. Higher VSC production rates were detected in surface sediments in eutrophic regions but in deep sediments in oligotrophic regions. Sulfuricurvum, Thiobacillus and Sulfuricella were the main sulfur-oxidizing bacteria (SOB) in the sediments, while Desulfatiglans and Desulfobacca were the predominant SRB. Organic matter, Fe(3+), NO(3)(-)-N and total sulfur had significant influences on the microbial communities in the sediments. Partial least squares path modelling showed that the trophic level index could stimulate VSC emissions from lake sediments by influencing the activities and abundances of SOB and SRB. These findings indicated that sediments contributed substantially to VSC emissions from eutrophic lakes, especially surface sediments, and sediment dredging might be an effective way to mitigate VSC emissions from eutrophic lakes" |
| Keywords: | *Lakes/microbiology Bacteria/metabolism Sulfur/metabolism *Desulfovibrio Sulfur Compounds/metabolism Eutrophication Geologic Sediments/chemistry China Eutrophic lake Microbial activity Sulfate-reducing bacteria Sulfur-oxidizing bacteria Volatile sulfur co; |
| Notes: | "MedlineWang, Jing Wei, Zhi-Peng Chu, Yi-Xuan Tian, Guangming He, Ruo eng Netherlands 2023/05/14 Sci Total Environ. 2023 Aug 20; 887:164054. doi: 10.1016/j.scitotenv.2023.164054. Epub 2023 May 12" |
