气候变化领域集成服务门户(CCPortal): Groundwater inflows control patterns and sources of greenhouse gas emissions from streams

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DOI	10.1002/lno.11134
	Groundwater inflows control patterns and sources of greenhouse gas emissions from streams
	Lupon A.; Denfeld B.A.; Laudon H.; Leach J.; Karlsson J.; Sponseller R.A.
发表日期	2019
ISSN	19395590
起始页码	1545
结束页码	1557
卷号	64 期号:4
英文摘要	Headwater streams can be important sources of carbon dioxide (CO2) and methane (CH4) to the atmosphere. However, the influence of groundwater–stream connectivity on the patterns and sources of carbon (C) gas evasion is still poorly understood. We explored these connections in the boreal landscape through a detailed study of a 1.4 km lake outlet stream that is hydrologically fed by multiple topographically driven groundwater input zones. We measured stream and groundwater dissolved organic C (DOC), CO2, and CH4 concentrations every 50 m biweekly during the ice-free period and estimated in-stream C gas production through a mass balance model and independent estimates of aquatic metabolism. The spatial pattern of C gas concentrations was consistent over time, with peaks of both CH4 and CO2 concentrations occurring after each groundwater input zone. Moreover, lateral C gas inputs from riparian soils were the major source of CO2 and CH4 to the stream. DOC mineralization and CH4 oxidation within the stream accounted for 17–51% of stream CO2 emissions, and this contribution was the greatest during relatively higher flows. Overall, our results illustrate how the nature and arrangement of groundwater flowpaths can organize patterns of stream C concentrations, transformations, and emissions by acting as a direct source of gases and by supplying organic substrates that fuel aquatic metabolism. Hence, refined assessments of how catchment structure influences the timing and magnitude of groundwater–stream connections are crucial for mechanistically understanding and scaling C evasion rates from headwaters. Association for the Sciences of Limnology and Oceanography
scopus关键词	air-water interaction; aquatic organism; carbon dioxide; catchment; dissolved organic carbon; emission; greenhouse gas; groundwater-surface water interaction; oxidation; streamwater
来源期刊	Limnology and Oceanography
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/176393
作者单位	Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden; Department of Ecology and Environmental Science, Umeå University, Umeå, Sweden; Natural Resources Canada, Canadian Forest Service, Sault Ste. Marie, ON, Canada
推荐引用方式 GB/T 7714	Lupon A.,Denfeld B.A.,Laudon H.,et al. Groundwater inflows control patterns and sources of greenhouse gas emissions from streams[J],2019,64(4).
APA	Lupon A.,Denfeld B.A.,Laudon H.,Leach J.,Karlsson J.,&Sponseller R.A..(2019).Groundwater inflows control patterns and sources of greenhouse gas emissions from streams.Limnology and Oceanography,64(4).
MLA	Lupon A.,et al."Groundwater inflows control patterns and sources of greenhouse gas emissions from streams".Limnology and Oceanography 64.4(2019).