Winter climate controls soil carbon dynamics during summer in boreal forests

Haei, Mahsa and Oquist, Mats G. and Kreyling, Juergen and Ilstedt, Ulrik and Laudon, Hjalmar (2013) Winter climate controls soil carbon dynamics during summer in boreal forests. Environmental Research Letters, 8 (2). ISSN 1748-9326

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Boreal forests, characterized by distinct winter seasons, store a large proportion of the global terrestrial carbon (C) pool. We studied summer soil C-dynamics in a boreal forest in northern Sweden using a seven-year experimental manipulation of soil frost. We found that winter soil climate conditions play a major role in controlling the dissolution/mineralization of soil organic-C in the following summer season. Intensified soil frost led to significantly higher concentrations of dissolved organic carbon (DOC). Intensified soil frost also led to higher rates of basal heterotrophic CO2 production in surface soil samples. However, frost-induced decline in the in situ soil CO2 concentrations in summer suggests a substantial decline in root and/or plant associated rhizosphere CO2 production, which overrides the effects of increased heterotrophic CO2 production. Thus, colder winter soils, as a result of reduced snow cover, can substantially alter C-dynamics in boreal forests by reducing summer soil CO2 efflux, and increasing DOC losses.

Item Type: Article
Language: English
Future Forest Subject: Skogsbruk i klimatförändringens tid > Natur
Depositing User: Christer Enkvist
Date Deposited: 28 Feb 2017 14:27
Last Modified: 28 Feb 2017 14:27

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