N2O Fluxes and Rates of Nitrification and Denitrification at the Sediment–Water Interface in Taihu Lake, China
| Autor: | Xiao-Lan Zheng, Dehong Liu, Juhua Yu, Wenhui Zhong, Chengxin Fan, Ji-cheng Zhong |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Pollution
lcsh:Hydraulic engineering Denitrification 010504 meteorology & atmospheric sciences media_common.quotation_subject Geography Planning and Development 010501 environmental sciences Aquatic Science Simultaneous nitrification-denitrification 01 natural sciences Biochemistry chemistry.chemical_compound lcsh:Water supply for domestic and industrial purposes lcsh:TC1-978 Sediment–water interface medicine 0105 earth and related environmental sciences Water Science and Technology media_common lcsh:TD201-500 denitrification sediment–water interface Nitrous oxide Seasonality nitrous oxide flux medicine.disease nitrification chemistry Environmental chemistry Environmental science Nitrification Eutrophication Taihu Lake China |
| Zdroj: | Water Volume 10 Issue 7 Water, Vol 10, Iss 7, p 911 (2018) |
| ISSN: | 2073-4441 |
| DOI: | 10.3390/w10070911 |
| Popis: | Because of global concerns regarding pollution and eutrophication in fresh water, China&rsquo s Taihu Lake has gained attention both for these issues and as a source of nitrous oxide (N2O) emissions. In this study, we investigated N2O fluxes and nitrification and denitrification rates at the sediment&ndash water interface and analyzed monthly the relationships between these processes in different areas of Taihu Lake over a one-year period. Annual maximum nitrification and denitrification rate and N2O flux were observed during June in an algae-dominated area of the lake and measured 17.80, 235.51, and 31.49 µ mol N m&minus 2 h&minus 1, respectively. The nitrification rate ranged from 0 to 1.18 µ 1 at other sampling sites, with less variation. The denitrification rate showed clear seasonal variation, with lower levels between August and January (0.01&ndash 8.57 µ 1 average = 1.49 µ 1) and a rapid increase between February and July (1.03&ndash 235.51 µ average = 41.73 µ 1).The N2O flux ranged from &minus 0.64 to 1.5 µ 1, with little variability except for a much higher rate (31.49 µ 1) in June in algae-dominated areas. N2O flux was significantly positively correlated with nitrification and denitrification rates in most lake zones. By comparing the slopes of the regression equations, we found that N2O emissions from the sediment&ndash water interface were influenced predominantly by nitrification, suggesting that lower N2O fluxes from the sediment&ndash water interface in Taihu Lake are caused primarily by lower nitrification rates. |
| Databáze: | OpenAIRE |
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