气候变化领域集成服务门户(CCPortal): Contrasting responses in dissolved organic carbon to extreme climate events from adjacent boreal landscapes in Northern Sweden

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DOI	10.1088/1748-9326/ab23d4
	Contrasting responses in dissolved organic carbon to extreme climate events from adjacent boreal landscapes in Northern Sweden
	Tiwari T.; Sponseller R.A.; Laudon H.
发表日期	2019
ISSN	17489318
卷号	14 期号:8
英文摘要	The ongoing pressures of climate change, as expressed by the increased intensity, duration, and frequency of temperature and precipitation events, threatens the storage of carbon in northern latitudes. One key concern is how these events will affect the production, mobilization, and export of dissolved organic carbon (DOC), the main form of aquatic carbon export in these regions. In this study, we retrospectively show contrasting effects of climate extremes over 23 years on two adjacent boreal catchments, one dominated by forest cover and the other draining a mire (wetland), despite experiencing the same extreme climate events. During the peak snowmelt, DOC concentrations ranged from 20 to 33 mg l-1 in the forest catchment and 10-28 mg l-1 in the mire catchment respectively, highlighting large inter-annual variation in the springtime hydrologic C export at both sites. We used climate and discharge variables to predict this variation, and found that DOC from the forested catchment, which is derived largely from riparian soils, had the highest concentrations following cold summers, dry autumns, and winters with high precipitation. By contrast, in the mire outlet, where DOC is primarily derived from decomposing peat, the highest DOC concentrations in the spring followed cold/dry winters and dry summers. Our results indicate that processes regulating stream DOC concentrations during spring in both catchments were dependent on both temperature and precipitation in multiple seasons. Together, these patterns suggest that DOC responses to climatic extremes are complex and generate variable patterns in springtime concentrations that are strongly dependent upon landscape context. © 2019 The Author(s). Published by IOP Publishing Ltd.
英文关键词	boreal forest; boreal streams; climate change; dissolve organic carbon; extreme climate events; peatland; water quality
语种	英语
scopus关键词	Catchments; Forestry; Organic carbon; Runoff; Stream flow; Water quality; Wetlands; Boreal forests; Boreal stream; Dissolved organic carbon; Extreme climates; Forested catchments; Interannual variation; Peatland; Precipitation events; Climate change; annual variation; boreal forest; carbon cycle; catchment; climate change; dissolved organic carbon; forest cover; landscape; organic carbon; peatland; precipitation (climatology); seasonal variation; snowmelt; water quality
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/154480
作者单位	Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umea, SE-901 83, Sweden; Department of Ecology and Environmental Sciences, Umea University, Umea, SE-901 87, Sweden
推荐引用方式 GB/T 7714	Tiwari T.,Sponseller R.A.,Laudon H.. Contrasting responses in dissolved organic carbon to extreme climate events from adjacent boreal landscapes in Northern Sweden[J],2019,14(8).
APA	Tiwari T.,Sponseller R.A.,&Laudon H..(2019).Contrasting responses in dissolved organic carbon to extreme climate events from adjacent boreal landscapes in Northern Sweden.Environmental Research Letters,14(8).
MLA	Tiwari T.,et al."Contrasting responses in dissolved organic carbon to extreme climate events from adjacent boreal landscapes in Northern Sweden".Environmental Research Letters 14.8(2019).