Carbon dynamics in a Boreal land-stream-lake continuum during the spring freshet of two hydrologically contrasting years
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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 , vol. 148 , no. 1 , pp. 91-109 . https://doi.org/10.1007/s10533-020-00648-9
| Title: | Carbon dynamics in a Boreal land-stream-lake continuum during the spring freshet of two hydrologically contrasting years |
| Author: | Miettinen, H.; Pumpanen, J.; Rantakari, M.; Ojala, A. |
| Contributor organization: | Faculty of Biological and Environmental Sciences Ecosystems and Environment Research Programme Anne Ojala / Principal Investigator Ecosystem processes (INAR Forest Sciences) Institute for Atmospheric and Earth System Research (INAR) Faculty of Agriculture and Forestry |
| Date: | 2020-03 |
| Language: | eng |
| Number of pages: | 19 |
| Belongs to series: | Biogeochemistry |
| ISSN: | 0168-2563 |
| DOI: | https://doi.org/10.1007/s10533-020-00648-9 |
| URI: | http://hdl.handle.net/10138/313715 |
| Abstract: | 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. |
| Subject: |
CO2
DOC Lake carbon dynamics Temporality Terrestrial carbon export DISSOLVED ORGANIC-CARBON WATER CO2 CONCENTRATION AQUATIC CARBON TEMPORAL VARIABILITY PEATLAND CATCHMENTS HEADWATER STREAMS SOIL-WATER DIOXIDE SNOWMELT FLUXES 1181 Ecology, evolutionary biology 1172 Environmental sciences |
| Peer reviewed: | Yes |
| Rights: | cc_by |
| Usage restriction: | openAccess |
| Self-archived version: | publishedVersion |
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