Dominance of nitrous oxide production by nitrification and denitrification in the shallow Chaohu Lake, Eastern China: Insight from isotopic characteristics of dissolved nitrous oxide
文献类型：期刊论文
| 作者 | Li, Qingqian1,2; Wang, Fang2; Yu, Qibiao2; Yan, Weijin2; Li, Xinyan3; Lv, Shucong2 |
| 刊名 | ENVIRONMENTAL POLLUTION
 |
| 出版日期 | 2019-12-01 |
| 卷号 | 255页码:11 |
| 关键词 | N2O Isotopic composition Site preference Nitrification Denitrification |
| ISSN号 | 0269-7491 |
| DOI | 10.1016/j.envpol.2019.113212 |
| 通讯作者 | Yan, Weijin(yanwj@igsnrr.ac.cn) |
| 英文摘要 | In recent decades, most lakes in Eastern China have suffered unprecedented nitrogen pollution, making them potential "hotspots" for N2O production and emission. Understanding the mechanisms of N2O production and quantifying emissions in these lakes is essential for assessing regional and global N2O budgets and for mitigating N2O emissions. Here, we measure isotopic compositions (delta N-15-N2O and delta O-18-N2O) and site preference (SP) of dissolved N2O in an attempt to differentiate the relative contribution of N2O production processes in the shallow, eutrophic Chaohu Lake, Eastern China. Our results show that the bulk isotope ratios for delta N-15-N2O, delta O-18-N2O, and SP were 5.8 +/- 3.9 parts per thousand, 293 +/- 13.4 parts per thousand, and 18.6 +/- 3.2 parts per thousand, respectively. More than 76.8% of the dissolved N2O was produced via microbial processes. Findings suggest that dissolved N2O is primarily produced via nitrification (between 27.3% and 48.0%) and denitrification (between 31.9% and 49.5%). In addition, isotopic data exhibit significant N2O consumption during denitrification. We estimate the average N2O emission rate (27.5 +/- 26.0 mu g N m(-2) h(-1)), which is higher than that from rivers in the Changjiang River network (CRN). We scaled-up the regional N2O emission (from 1.98 Gg N yr(-1) to 4.58 Gg N yr(-1)) using a N2O emission factor (0.51 +/- 0.63%) for shallow lakes in the middle and lower region of the CRN. We suggest that beneficial circumstances for promoting complete denitrification may be helpful for reducing N2O production and emissions in fresh surface waters. (C) 2019 Elsevier Ltd. All rights reserved. |
| WOS关键词 | CARBON-DIOXIDE ; FRESH-WATER ; FRACTIONATION FACTORS ; SUSPENDED SEDIMENT ; STABLE-ISOTOPE ; WIND-SPEED ; N2O ; REDUCTION ; EMISSIONS ; NITRATE |
| 资助项目 | National Key Research and Development Program of China[2016YFA0601004] ; National Key Research and Development Program of China[2016YFA0602704] ; National Natural Science Foundation of China[41877483] ; National Natural Science Foundation of China[41371454] ; National Natural Science Foundation of China[41771050] ; National Natural Science Foundation of China[41671479] |
| WOS研究方向 | Environmental Sciences & Ecology |
| 语种 | 英语 |
| WOS记录号 | WOS:000499733500093 |
| 出版者 | ELSEVIER SCI LTD |
| 资助机构 | National Key Research and Development Program of China ; National Natural Science Foundation of China |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/130099]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Yan, Weijin |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China 3.Chinese Acad Sci, Nanjing Inst Geog & Limnol, Nanjing 210008, Jiangsu, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Qingqian,Wang, Fang,Yu, Qibiao,et al. Dominance of nitrous oxide production by nitrification and denitrification in the shallow Chaohu Lake, Eastern China: Insight from isotopic characteristics of dissolved nitrous oxide[J]. ENVIRONMENTAL POLLUTION,2019,255:11. |
| APA | Li, Qingqian,Wang, Fang,Yu, Qibiao,Yan, Weijin,Li, Xinyan,&Lv, Shucong.(2019).Dominance of nitrous oxide production by nitrification and denitrification in the shallow Chaohu Lake, Eastern China: Insight from isotopic characteristics of dissolved nitrous oxide.ENVIRONMENTAL POLLUTION,255,11. |
| MLA | Li, Qingqian,et al."Dominance of nitrous oxide production by nitrification and denitrification in the shallow Chaohu Lake, Eastern China: Insight from isotopic characteristics of dissolved nitrous oxide".ENVIRONMENTAL POLLUTION 255(2019):11. |
入库方式： OAI收割
来源：地理科学与资源研究所
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