IGSNRR OpenIR
Temporal Patterns of Methane Emissions From Two Streams With Different Riparian Connectivity
Leng, Peifang1,2; Kamjunke, Norbert3; Li, Fadong2,4; Koschorreck, Matthias1
2021-08-01
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
ISSN2169-8953
Volume126Issue:8Pages:20
Corresponding AuthorLeng, Peifang(peifang.leng@ufz.de)
AbstractStreams 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.
Keywordstreams methane (CH4) emissions temporal variability long-term monitoring hydrologic connectivity
DOI10.1029/2020JG006104
WOS KeywordDISSOLVED ORGANIC-MATTER ; CARBON-DIOXIDE ; SPECTROPHOTOMETRIC DETERMINATION ; HEADWATER STREAMS ; WATER ; CO2 ; CH4 ; FLUXES ; RIVER ; FLOW
Indexed BySCI
Language英语
Funding ProjectHelmholtz Society (project Terrestrial Environmental Observatories, TERENO) ; Projekt DEAL
Funding OrganizationHelmholtz Society (project Terrestrial Environmental Observatories, TERENO) ; Projekt DEAL
WOS Research AreaEnvironmental Sciences & Ecology ; Geology
WOS SubjectEnvironmental Sciences ; Geosciences, Multidisciplinary
WOS IDWOS:000688734500022
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/165315
Collection中国科学院地理科学与资源研究所
Corresponding AuthorLeng, Peifang
Affiliation1.UFZ Helmholtz Ctr Environm Res, Dept Lake Res, Magdeburg, Germany
2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing, Peoples R China
3.UFZ Helmholtz Ctr Environm Res, Dept River Ecol, Magdeburg, Germany
4.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China
Recommended Citation
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.
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