La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Response of Dissolved Organic Carbon following Forest Harvesting in a Boreal Forest
Auteurs :	Hjalmar Laudon, Auteur ; Johannes Hedtjarn, Auteur ; Jakob Schelker, Auteur ; Kevin Bishop, Auteur ; Rasmus Sorensen, Auteur ; Anneli Agren, Auteur
Type de document :	Article
Dans :	AMBIO (38(7) NOV 2009)
Article en page(s) :	381-386
Langues:	Anglais
Résumé :	To determine if forestry affects stream water dissolved organic carbon (DOC) concentrations, we conducted high frequency water sampling at a clear-cut catchment experiment in northern Sweden 1 year after harvesting. The overall finding was that harvesting significantly increased stream water DOC in these boreal forest catchments, at least during the growing season. The results indicate a DOC concentration increase of up to 50% during early summer on the two harvested catchments relative to the two control catchments. The analysis supports the hypothesis that a raised groundwater level following harvesting caused the increased DOC concentration during both hydrological episodes and low flow conditions. Harvesting resulted in a 70% increase in DOC export due to the combined effect of runoff and DOC concentration during the June-October study period. Given the extent of forestry activity in the boreal landscape, these results demonstrate that tree harvesting will affect the water quality of the region.

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