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Depletion of 14C—added as trialanine—in Arctic tundra soils: Heath mineral soil (a, b), Meadow mineral soil (c, d) and Meadow organic soil (e, f) after they had been subjected to 1 (a, c, e) or 3 (b, d, f) freeze–thaw cycles (−7.5 to +5 °C). The results are fitted with a double first-order exponential decay equation. Error bars indicate ± 1SE
