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Carbon Pools and Accumulation Rates in an Age-Series of Soils in Drained Thaw-Lake Basins, Arctic Alaska

^a Dep. of Soil Sci., 1525 Observatory Dr., Univ. of Wisconsin, Madison, WI 537060-1299
^b Dep. of Geography, P.O. Box 210131, Univ. of Cincinnati, Cincinnati, OH 45221-0131

View larger version (143K): [in a new window]   Fig. 1. Landsat7 ETM+ image from 30 Aug. 2000 for the Barrow Peninsula, Alaska, showing oriented thaw lakes (blue) and shadows of drained thaw lake basins (green).

View larger version (29K): [in a new window]   Fig. 2. Relation between thickness of the organic layer and basin age class (upper panel) and between thickness of the organic layer and 14C age (lower panel) (after Hinkel et al., 2003). In the upper panel, the median value with quartiles is shown by horizontal bars, the range of values by whiskers, and the mean with a black dot; differences in small case letters are statistically significant at p = 0.05. PER, Peterson Erosional Remnant.

View larger version (28K): [in a new window]   Fig. 3. Relation between degree of decomposition of the organic layer and basin age class. PER, Peterson Erosional Remnant.

View larger version (61K): [in a new window]   Fig. 4. Relation between forms of extractable organic matter in the organic layer and basin age class.

View larger version (69K): [in a new window]   Fig. 5. Carbon density of the organic layer, the base of the organic layer to a depth of 35 cm, 35 to 100 cm, 0 to 100 cm, and >100 cm in relation to basin age class. Differences in small-case letters distributed across the basin age classes for a particular layer in the profile are statistically different at p < 0.05. TOC, total organic C.

View larger version (23K): [in a new window]   Fig. 6. Spatial variability in SOC of 12 samples collected from the organic layer of young, medium, old, and ancient drained thaw-lake basins. CV, confidence value; nd, not determined.