Fig. 1. A schematic diagram (not to scale) illustrating the time course of events and the soil water potentials during the experiment. Oak and grass soil samples were adjusted to identical soil water potentials. * equals a set of samples were destructively harvested for unfumigated and fumigated extractions. Dashed lines indicate the time periods during which we monitored CO₂ and ¹⁴C-CO₂ production.

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