期刊
HYDROLOGICAL PROCESSES
卷 28, 期 22, 页码 5483-5494出版社
WILEY
DOI: 10.1002/hyp.10056
关键词
geophysics; peatlands; carbon cycle
资金
- National Science Foundation [1045084]
- UK Natural Environment Research Council [NE/F004958/1]
- Directorate For Geosciences [1045084] Funding Source: National Science Foundation
- Directorate For Geosciences
- Division Of Earth Sciences [1044953] Funding Source: National Science Foundation
- Division Of Earth Sciences [1045084] Funding Source: National Science Foundation
- Natural Environment Research Council [ceh010010, NE/F004958/1] Funding Source: researchfish
- NERC [NE/F004958/1] Funding Source: UKRI
Northern peatlands are a large source of atmospheric methane (CH4) and both a source and a sink of atmospheric carbon dioxide (CO2). The rate and temporal variability in gas exchanges with peat soils is directly related to the spatial distribution of these free-phase gases within the peat column. In this paper, we present results from surface and borehole ground-penetrating radar surveys - constrained with direct soil and gas sampling - that compare the spatial distribution of gas accumulations in two raised bogs: one in Wales (UK), the other in Maine (USA). Although the two peatlands have similar average thickness, physical properties of the peat matrix differ, particularly in terms of peat type and degree of humification. We hypothesize that these variations in physical properties are responsible for the differences in gas distribution between the two peatlands characterized by (1) gas content up to 10.8% associated with woody peat and presence of wood layers in Caribou Bog (Maine) and (2) a more homogenous distribution with gas content up to 5.7% at the surface (i.e. <0.5m deep) in Cors Fochno (Wales). Our results highlight the variability in biogenic gas accumulation and distribution across peatlands and suggest that the nature of the peat matrix has a key role in defining how biogenic gas accumulates within and is released to the atmosphere from peat soils. Copyright (C) 2013 John Wiley & Sons, Ltd.
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