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Post-fire Soil Water Repellency

Persistence and Soil Moisture Thresholds

^a Dep. of Forest, Rangeland, and Watershed Stewardship, Colorado State Univ., Fort Collins, CO 80523-1472
^b Allegheny National Forest, 222 Liberty St., Warren, PA, 16365

View larger version (14K): [in a new window]   Fig. 1. Median critical surface tension (CST) values for unburned sites and sites burned at high, moderate, and low severity: (a) immediately after burning, (b) three months after burning, and (c) 12 mo after burning. Each symbol represents the median of 12 site values for each burn severity class and nine site values for unburned sites.

View larger version (23K): [in a new window]   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.