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Fig. 2. Critical surface tension (CST) values at the soil surface and 3 cm versus surface soil moisture content for: (a) sites burned at high severity (n = 84); (b) sites burned at moderate severity (n = 82); (c) sites burned at low severity (n = 74); and (d) unburned sites (n = 54). Vertical dashed lines in (b) through (d) indicate the proposed soil moisture thresholds for the change from water repellent to hydrophilic. The question mark in (a) indicates that the soil moisture threshold for areas burned at high severity is at least 26% but is uncertain because of the lack of CST data at higher soil moisture values.
