Sensitivity of Boreal Forest Carbon Balance to Soil Thaw

摘要: We used eddy covariance; gas-exchange chambers; radiocarbon analysis; wood, moss, and soil inventories; laboratory incubations to measure the carbon balance of a 120-year-old black spruce forest in Manitoba, Canada. The site lost 0.3 ± 0.5 metric ton per hectare year (ton C ha−1 year−1) from 1994 1997, with gain 0.6 0.2 ha−1year−1 moss wood offset by loss 0.8 year−1 soil. remained frozen most year, decomposition organic matter increased 10-fold upon thawing. stability pool (∼150 tons ha−1) appears sensitive depth duration thaw, climatic changes that promote thaw are likely cause net efflux dioxide site.