Fig. 7. Carbon dioxide release from the O horizon and water contents in the leaf litter layer, and at the 2- and 5-cm depths in a second laboratory microcosm experiment. O horizon material was initially air-dried. Stepwise additions of 2, 2, 4, 4, and 8 mm of water were applied sequentially over 5 d. Error bars represent the standard error of the mean of three replicate microcosms (n = 3).

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