Fig. 6. Carbon dioxide release of O horizon, and water contents of leaf litter layer, the 2- and 5-cm depth during drying and wetting cycles. The O horizon material was initially air-dry. Stepwise additions of 0.5, 1, 2, 4, 8, and 0.5 mm of water were applied sequentially over 79 d in laboratory microcosm experiments. Error bars represent the standard error of the mean of three replicate microcosms (n = 3).

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