气候变化领域集成服务门户(CCPortal): Carbon dynamics in a Boreal land-stream-lake continuum during the spring freshet of two hydrologically contrasting years

CCPortal

DOI	10.1007/s10533-020-00648-9
	Carbon dynamics in a Boreal land-stream-lake continuum during the spring freshet of two hydrologically contrasting years
	Miettinen H.; Pumpanen J.; Rantakari M.; Ojala A.
发表日期	2020
ISSN	0168-2563
起始页码	91
结束页码	109
卷号	148 期号:1
英文摘要	We studied in 2013 and 2014 the spring carbon dynamics in a Boreal landscape consisting of a lake and 15 inflowing streams and an outlet. The first year had weather and a hydrological regime typical of past years with a distinct spring freshet connected with the thaw of the average snowpack. The latter year had higher air temperatures which did not permit snow accumulation, despite similar winter precipitation. As such, there was hardly any spring freshet in 2014, and stream discharge peaked in January, i.e., the conditions resembled those predicted in the future climate. Despite the hydrological differences between the years, there were only small interannual differences in the stream CO2 and DOC concentrations. The relationship between the concentrations and discharge was stronger in the typical year. CO2 concentrations in medium-sized streams correlated negatively with the discharge, indicating dilution effect of melting snowpacks, while in large-sized streams the correlation was positive, suggesting stronger groundwater influence. The DOC pathway to these streams was through the subsurface soil layers, not the groundwater. The total amount of carbon transported into the lake was ca. 1.5-fold higher in the typical year than in the year with warm winter. In 2013, most of the lateral inputs took place during spring freshet. In 2014, the majority of inputs occurred earlier, during the winter months. The lateral CO2 signal was visible in the lake at 1.5 m depth. DOC dominated the carbon transport, and in both years, 12% of the input C was in inorganic form. © 2020, The Author(s).
英文关键词	CO2; DOC; Lake carbon dynamics; Temporality; Terrestrial carbon export
语种	英语
scopus关键词	Boreal Kingdom; concentration (composition); dilution; discharge; dissolved organic carbon; groundwater resource; groundwater-surface water interaction; hydrological regime; lacustrine environment; melting; snowpack; spring (hydrology)
来源期刊	Biogeochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153163
作者单位	Faculty of Biological and Environmental Sciences, University of Helsinki, P.O. Box 65, Helsinki, 00014, Finland; Department of Environmental and Biological Sciences, University of Eastern Finland, P.O. Box 1627, Kuopio, 70211, Finland; Urban Environment Division, Environment Protection Unit, City of Helsinki, P.O. Box 58235, Helsinki, 00099, Finland; Faculty of Biological and Environmental Sciences, Ecosystems and Environment Research Programme, University of Helsinki, Niemenkatu 73, Lahti, 15140, Finland; Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, P.O. Box 68, Helsinki, 00014, Finland; Faculty of Agriculture and Forestry, Institute for Atmospheric and Earth System Research/Forest Sciences, University of Helsinki, P.O. Box 27, Helsinki, 00014, Finland; Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Skogsmarksgränd 17, Umeå, 90183, Sweden
推荐引用方式 GB/T 7714	Miettinen H.,Pumpanen J.,Rantakari M.,et al. Carbon dynamics in a Boreal land-stream-lake continuum during the spring freshet of two hydrologically contrasting years[J],2020,148(1).
APA	Miettinen H.,Pumpanen J.,Rantakari M.,&Ojala A..(2020).Carbon dynamics in a Boreal land-stream-lake continuum during the spring freshet of two hydrologically contrasting years.Biogeochemistry,148(1).
MLA	Miettinen H.,et al."Carbon dynamics in a Boreal land-stream-lake continuum during the spring freshet of two hydrologically contrasting years".Biogeochemistry 148.1(2020).