Diffusive CH4 Emissions From Agricultural Ditches Overshadow CH4 Sinks by Upland Fields
文献类型：期刊论文
| 作者 | Wu, Wenxin3,4; Yan, Zhifeng4,9; Peacock, Mike7,8; Ge, Zhengkui4; Wei, Xinhai4; Yao, Yuanzhi2; Ayal, Desalegn Yayeh1; Yu, Guirui4,5; Smith, Pete6 |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
 |
| 出版日期 | 2025-11-14 |
| 卷号 | 130期号:11页码:e2025JG009175 |
| 关键词 | agricultural ditch methane emission cropland soil methane uptake |
| ISSN号 | 2169-8953 |
| DOI | 10.1029/2025JG009175 |
| 产权排序 | 8 |
| 文献子类 | Article |
| 英文摘要 | Ditches are potentially important sources of methane (CH4) in agricultural regions, but their CH4 emissions are largely unknown due to data scarcity. Here, we investigated CH4 concentrations and diffusive fluxes across different ditches in the North China Plain (NCP), an extensive upland agricultural region with maize-wheat rotations, and well-constructed ditch systems. Based on intensive monthly and extensive regional surveys, we found that (mean +/- SD) CH4 concentrations (11.42 +/- 37.69 mu mol L-1) and fluxes (344.7 +/- 1,198.1 mu mol m-2 h-1) in the agricultural ditches (ADs) showed high variability, primarily driven by spatial and temporal heterogeneity in nutrient and carbon inputs. On average, CH4 concentrations and fluxes were 3-12 times higher than those in the nearby agricultural-rural ditches (3.80 mu mol L-1, 99.8 mu mol m-2 h-1) and rivers (0.92 mu mol L-1, 47.1 mu mol m-2 h-1). Dissolved organic carbon (DOC) and ammonium (NH4 +-N) were primary drivers of CH4 emissions in the ADs, highlighting the key role of nutrient and carbon inputs from surrounding fields. The annual diffusive CH4 emission from ADs in the NCP was estimated to be 1,836.3 +/- 311.6 Gg CH4 yr-1 and 68.1 +/- 7.3 Gg CH4 yr-1 based on the mean and median CH4 fluxes, respectively, acting as a significant source of CH4 emissions, despite large uncertainty. This emission overwhelmingly offsets the CH4 uptake by soils (i.e., -9.2 Gg CH4 yr-1) in the NCP, highlighting the necessity of including CH4 emissions from ADs in estimating CH4 budget from upland agricultural regions. |
| URL标识 | 查看原文 |
| WOS关键词 | NORTH CHINA PLAIN ; NITROUS-OXIDE EMISSIONS ; GAS-EXCHANGE ; METHANE EMISSIONS ; CARBON-DIOXIDE ; WATER ; LAKE ; SYSTEMS ; FLUX |
| WOS研究方向 | Environmental Sciences & Ecology ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001614551000001 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/217659]  |
| 专题 | 生态系统网络观测与模拟院重点实验室_外文论文 |
| 通讯作者 | Yan, Zhifeng |
| 作者单位 | 1.Addis Ababa Univ, Coll Dev Studies, Ctr Food Secur Studies, Addis Ababa, Ethiopia; 2.East China Normal Univ, Sch Geog Sci, Shanghai, Peoples R China; 3.Univ Waterloo, Dept Earth & Environm Sci, Ecohydrol Res Grp, Waterloo, ON, Canada; 4.Tianjin Univ, Inst Surface Earth Syst Sci, Sch Earth Syst Sci, Tianjin, Peoples R China; 5.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing, Peoples R China; 6.Univ Aberdeen, Inst Biol & Environm Sci, Aberdeen, Scotland 7.Swedish Univ Agr Sci, Dept Aquat Sci & Assessment, Uppsala, Sweden; 8.Univ Liverpool, Sch Environm Sci, Dept Geog & Planning, Liverpool, England; 9.Tianjin Univ, Tianjin Key Lab Earth Crit Zone Sci & Sustainable, Crit Zone Observ Bohai Coastal Reg, Tianjin, Peoples R China; |
| 推荐引用方式 GB/T 7714 | Wu, Wenxin,Yan, Zhifeng,Peacock, Mike,et al. Diffusive CH4 Emissions From Agricultural Ditches Overshadow CH4 Sinks by Upland Fields[J]. JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,2025,130(11):e2025JG009175. |
| APA | Wu, Wenxin.,Yan, Zhifeng.,Peacock, Mike.,Ge, Zhengkui.,Wei, Xinhai.,...&Smith, Pete.(2025).Diffusive CH4 Emissions From Agricultural Ditches Overshadow CH4 Sinks by Upland Fields.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,130(11),e2025JG009175. |
| MLA | Wu, Wenxin,et al."Diffusive CH4 Emissions From Agricultural Ditches Overshadow CH4 Sinks by Upland Fields".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 130.11(2025):e2025JG009175. |
入库方式： OAI收割
来源：地理科学与资源研究所
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