We calculated carbon budgets for a chronosequence of harvested jack pine (Pinus banksiana Lamb.) stands (0-, 5-, 10-, and ~29-y-old) and a ~79-y-old stand that originated after wildfire. We measured total ecosystem C content (TEC), above-, and belowground net primary productivity (NPP) for each stand. All values are reported in order for the 0-, 5-, 10-, 29-, and 79-y-old stands, respectively, for May 1999 through April 2000. Total annual NPP (NPPT) for the stands (Mg C ha-1 y-1 ± 1 S.D.) was 0.9 ± 0.3, 1.3 ± 0.1, 2.7 ± 0.6, 3.5 ± 0.3, and 1.7 ± 0.4. We correlated periodic soil surface CO2 fluxes (RS) with soil temperature to model annual RS for the stands (Mg C ha-1 y-1 ± 1 S.D.) as 4.4 ± 0.1, 2.4 ± 0.0, 3.3 ± 0.1, 5.7 ± 0.3, and 3.2 ± 0.2. We estimated net ecosystem productivity (NEP) as NPPT minus RH (where RH was calculated using a Monte Carlo approach as coarse woody debris respiration plus 30-70% of total annual RS). Excluding C losses during wood processing, NEP (Mg C ha-1 y-1 ± 1 S.D.) for the stands was estimated to be -1.9 ± 0.7, -0.4 ± 0.6, 0.4 ± 0.9, 0.4 ± 1.0, and -0.2 ± 0.7 (negative values indicate net sources to the atmosphere.) We also calculated NEP values from the changes in TEC among stands. Only the 0-y-old stand showed significantly different NEP between the two methods, suggesting a possible mismatch for the chronosequence. The spatial and methodological uncertainties allow us to say little for certain except that the stand becomes a source of C to the atmosphere following logging.