Lise Dalsgaard

Forsker

(+47) 974 80 373
lise.dalsgaard@nibio.no

Sted
Ås - Bygg H8

Besøksadresse
Høgskoleveien 8, 1433 Ås

Biografi

Jeg bidrar til sammenstillingen rapporteringen og utviklingen av metodologien for det norsk klimagassregnskapet for landbrukssektoren (LULUCF - Land-use, Land-use change and Forestry) til FNs klimapanel og til Kyotoprotokollen. 

Arbeidsoppgavene mine er for det meste knyttet til estimater av endringer i mengden karbon i skogsjord som følge av arealbruksendringer.

For tiden er jeg involvert i følgende prosjekter:
  • INVENT ("Improving National forest inventory-based carbon stock change estimates for greenhouse gas inVENTories), finansiert av Forskningsrådet. INVENT er en del av FACCE ERA-GAS.
  • Karbonbalansen i drenerte avskogede myrer ("Long term carbon balance in drained afforested mires". Dette er et norsk tilleggsprosjekt til SNS-prosjektet "Menneskeskapte klimagassutslipp fra organisk skogjord: Resultatet av bedre taksering og betydningen for en bærekraftig skogforvaltning“. Prosjektet er finansiert av Miljødirektoratet.

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Til dokument

Sammendrag

Nordic and Canadian forests store substantial amounts of carbon (C) and are largely managed in a silvicultural system with clear-cut harvest. Previous meta-analyses of harvesting effects on soil C have shown short- to long-term declines after harvest, but effects of clear-cutting on boreal and northern temperate forest soil C stocks remain unresolved. We harmonized National Forest Soil Inventory (NFSI) data from Sweden, Denmark, Finland, Norway and Canada to examine soil C stocks up to 53 years following clear-cut harvest using a space-for-time approach. We analyzed forest floor and mineral soil C stocks in coniferous and deciduous/mixed forests. Coniferous forest floor C stocks decreased for ∼30 years after clear-cutting: when at its lowest stock level, Picea and Pinus forest floor C stocks had decreased by 23 % and 14 % relative to initial stock levels, respectively. Picea forest floor C stocks then remained close to its lowest levels until 53 years after clear-cutting, while for Pinus-dominated forests they increased again and recovered to the pre-harvest level 48 years after clear-cutting. No C stock changes were detected in the 0–10 cm or 10–20 cm mineral soil layers, while a small increase in 55–65 cm mineral soil was detected in Podzol soils. Data was too limited to detect statistical signals of clear-cutting for deciduous/mixed forests. Our results shows that clear-cut harvest has substantial and long-lasting effects on northern temperate and boreal forest soil C storage, and that combining data from several NFSIs can help elucidate forest management effects on soil C storage. Soil organic carbonForest harvestClear-cuttingBorealTemperateNational forest inventoryNational forest soil inventory