Fig. 2. Depth profiles of regolith water potential. Three watersheds of each vegetation type were sampled at each position. Mean data are reported for 10-cm depth increments. (a) Vegetation means derived from all profiles under each vegetation type (n = 9). Note the significant changes at depths 70 and 100 cm under grass vegetation and that water potential is significantly different between the two vegetation types below 100 cm. (b) Position means for chaparral watersheds (n = 3). (c) Position means for grass watersheds (n = 3). Standard error is shown for each depth increment.