Arrhenius equation construction and nitrate source identification of denitrification at the Lake Taihu sediment - water interface with (15) N isotope

Ma, Qiuxia1; Pang, Min2; Pang, Yong1; Zhang, Lu3; Huang, Zhilin1

2023-04-01

10.1007/s11356-023-27122-x

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH   影响因子和分区

0944-1344

1614-7499

Total nitrogen in Taihu Lake, China has gradually decreased since 2015 while the total phosphorus concentration has exhibited an increasing trend, indicating an asynchronous change. The dominant nitrogen removal process in freshwater ecosystems is denitrification which primarily occurs at the sediment-water interface. In this study, (15) N isotope incubation experiments were attempted to analyze the effect of water temperature on denitrification, to construct the regional denitrification Arrhenius equations considering water temperature, and to identify the nitrate source of denitrification in Lake Taihu sediments. The results indicated that the potential N-2 production rates and denitrification rates generally decreased in the west to east direction, which was significantly positively correlated with the nitrate concentration of overlying water by Pearson correlation coefficient analysis (P < 0.05). In addition, when the water temperature was lower than 30 degrees C, the rates of the potential N-2 production and denitrification were higher with an increase in water temperature, but when the water temperature was overhigh, denitrification was inhibited. The ratio of the total denitrification rate of nitrate from the water column in the sediment to the total denitrification rate during the incubation experiment was above 0.5 at each sampling site. This indicated that the denitrification in the Lake Taihu sediment primarily occurred at the expense of nitrate from the water column. The research results of Arrhenius equation construction and nitrate source identification of denitization can be applied to improve the accuracy of water quality model of Taihu Lake, which is of great significance to improve Taihu Lake water quality, and can act as a reference for the water environment treatment of other shallow eutrophic lakes in China and abroad.

Denitrification Arrhenius equation construction Nitrate source identification (15) N isotope Water temperature

SCI

英语

其他

National Natural Science Foundation of China[52000100] ; National Major Science and Technology Project of China["2018ZX07208-005","2018ZX07208-007"]

Environmental Sciences & Ecology

Environmental Sciences

WOS:000983787200022

SPRINGER HEIDELBERG

ENVIRONMENT/ECOLOGY

Web of Science

1.Hohai Univ, Coll Environm, Nanjing 210098, Peoples R China
2.Southern Univ Sci & Technol, Sch Environm Sci & Technol, Shenzhen 518055, Peoples R China
3.Chinese Acad Sci, Nanjing Inst Geog & Limnol, State Key Lab Lake Sci & Environm, Nanjing 210008, Peoples R China

Ma, Qiuxia,Pang, Min,Pang, Yong,et al. Arrhenius equation construction and nitrate source identification of denitrification at the Lake Taihu sediment - water interface with (15) N isotope[J]. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH,2023,30(24).

Ma, Qiuxia,Pang, Min,Pang, Yong,Zhang, Lu,&Huang, Zhilin.(2023).Arrhenius equation construction and nitrate source identification of denitrification at the Lake Taihu sediment - water interface with (15) N isotope.ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH,30(24).

Ma, Qiuxia,et al."Arrhenius equation construction and nitrate source identification of denitrification at the Lake Taihu sediment - water interface with (15) N isotope".ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH 30.24(2023).