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Winter climate controls soil carbon dynamics during summer in boreal forests
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 CO _2 production in surface soil samples. However, frost-induced decline in the in situ soil CO _2 concentrations in summer suggests a substantial decline in root and/or plant associated rhizosphere CO _2 production, which overrides the effects of increased heterotrophic CO _2 production. Thus, colder winter soils, as a result of reduced snow cover, can substantially alter C-dynamics in boreal forests by reducing summer soil CO _2 efflux, and increasing DOC losses.
Winter climate controls soil carbon dynamics during summer in boreal forests
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 CO _2 production in surface soil samples. However, frost-induced decline in the in situ soil CO _2 concentrations in summer suggests a substantial decline in root and/or plant associated rhizosphere CO _2 production, which overrides the effects of increased heterotrophic CO _2 production. Thus, colder winter soils, as a result of reduced snow cover, can substantially alter C-dynamics in boreal forests by reducing summer soil CO _2 efflux, and increasing DOC losses.
Winter climate controls soil carbon dynamics during summer in boreal forests
Mahsa Haei (author) / Mats G Öquist (author) / Juergen Kreyling (author) / Ulrik Ilstedt (author) / Hjalmar Laudon (author)
2013
Article (Journal)
Electronic Resource
Unknown
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