Temporal Patterns of Methane Emissions From Two Streams With Different Riparian Connectivity
文献类型：期刊论文
| 作者 | Leng, Peifang1,4; Kamjunke, Norbert3; Li, Fadong2,4; Koschorreck, Matthias1 |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
 |
| 出版日期 | 2021-08-01 |
| 卷号 | 126期号:8页码:20 |
| ISSN号 | 2169-8953 |
| 关键词 | streams methane (CH4) emissions temporal variability long-term monitoring hydrologic connectivity |
| DOI | 10.1029/2020JG006104 |
| 通讯作者 | Leng, Peifang(peifang.leng@ufz.de) |
| 英文摘要 | Streams are regionally important sources of CH4 to the atmosphere, but the temporal variability in and control on CH4 concentrations and emissions are not well understood. Especially, lack of long-term data hampers our ability to predict CH4 emissions from streams. Here, we present a 7-year data set of biweekly CH4 concentration and underlying potential drivers from two adjacent small German streams with contrasting riparian area characteristics. Over the 7-year study period, mean CH4 concentration and emissions were 0.20 and 0.07 mu mol L-1 and 2.01 and 0.84 mmol m(-2) d(-1) for the two streams, respectively. Our findings suggest that the combination of seasonality and topography ultimately shaped the considerable temporal variations of CH4. CH4 oxidation and production in the streams were probably of minor importance. Instead, fluctuations in CH4 concentrations likely reflected a temporal pattern of CH4 input from soils of the riparian zone with larger CH4 variations in the stream with more riparian lands. Structural equation modeling revealed dissolved organic carbon and nitrate as important predictors of CH4 concentration. However, we did not identify predictors of the considerable short-term variability, nor the explicit pathways of CH4 delivery to streams. The discrepancy of the CH4 flux between streams was likely triggered by different connectivities to riparian soils with higher CH4 emissions in the hydrologically more connected stream. Interannual comparison showed that changing hydrologic conditions, rather than warming, may impact future CH4 emissions from temperate streams. We predict that higher CH4 emissions occur in wetter years in streams with close connectivity to riparian soils. |
| WOS关键词 | DISSOLVED ORGANIC-MATTER ; CARBON-DIOXIDE ; SPECTROPHOTOMETRIC DETERMINATION ; HEADWATER STREAMS ; WATER ; CO2 ; CH4 ; FLUXES ; RIVER ; FLOW |
| 资助项目 | Helmholtz Society (project Terrestrial Environmental Observatories, TERENO) ; Projekt DEAL |
| WOS研究方向 | Environmental Sciences & Ecology ; Geology |
| 语种 | 英语 |
| 出版者 | AMER GEOPHYSICAL UNION |
| WOS记录号 | WOS:000688734500022 |
| 资助机构 | Helmholtz Society (project Terrestrial Environmental Observatories, TERENO) ; Projekt DEAL |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/165314]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Leng, Peifang |
| 作者单位 | 1.UFZ Helmholtz Ctr Environm Res, Dept Lake Res, Magdeburg, Germany 2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China 3.UFZ Helmholtz Ctr Environm Res, Dept River Ecol, Magdeburg, Germany 4.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Leng, Peifang,Kamjunke, Norbert,Li, Fadong,et al. Temporal Patterns of Methane Emissions From Two Streams With Different Riparian Connectivity[J]. JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,2021,126(8):20. |
| APA | Leng, Peifang,Kamjunke, Norbert,Li, Fadong,&Koschorreck, Matthias.(2021).Temporal Patterns of Methane Emissions From Two Streams With Different Riparian Connectivity.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,126(8),20. |
| MLA | Leng, Peifang,et al."Temporal Patterns of Methane Emissions From Two Streams With Different Riparian Connectivity".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 126.8(2021):20. |
入库方式： OAI收割
来源：地理科学与资源研究所
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