ABSTRACT
Information about carbon stocks in automorphic and semi-hydromorphic Russia’s taiga soils was analyzed (400 and 65 soil profiles, respectively). It is shown that the carbon stocks in organogenic horizons of semi-hydromorphic soils are either comparable with those in mineral soil horizons or are significantly greater. The spatial variability of carbon stock in mineral layers of semi-hydromorphic soils is remarkably lower than that in organogenic horizons. The Soil Organic Carbon (SOC) pool within a 100-cm layer of poorly drained soils could be 3 times greater than that in automorphic ones and tends to increase in soils with a higher degree of hydromorphism. The assessments that are solely based on auto-morphic soils, which have the largest spatial extents, tend to underestimate the SOC pools. The larger share of semi-hydromorphic and hydromorphic soils, the greater would be the degree of the underestimation.
