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Microclimate and Pedogenic Implications in a 50-Year-Old Chaparral and Pine Biosequence

^a Soil Science Division, Univ. of Idaho, Moscow, ID 83844-2339
^b USDA-U.S. Salinity Laboratory, 450 Big Springs Rd., Riverside, CA 92507
^c Soil and Water Sciences Program, Dep. of Environmental Sciences, Univ. of California, Riverside, CA 92521-0424
^d Dep. of Renewable Resources, Univ. of Alberta, Edmonton, AB T6G 2E3 Canada

View larger version (29K): [in a new window]   Fig. 1. Diagram of the lysimeter installation at the San Dimas Experimental Forest. The large, earthen-walled pits (referred to as unconfined lysimeters) used in this study are 5.3 by 5.3 by 2.1 m deep. The indicated species were planted on each lysimeter as well as surrounding buffer areas (indicated in white). Adenostoma, Quercus, and Pinus were used in this study. Figure modified from Patric (1961b).

View larger version (25K): [in a new window]   Fig. 2. Mean monthly soil temperature at selected depths from 1997 and 1998 data collected under (a) pine, (b) oak, and (c) chamise.

View larger version (17K): [in a new window]   Fig. 3. Daily maximum air temperatures and mineral soil surface temperatures taken directly under the litter layer of pine, oak, and chamise.

View larger version (23K): [in a new window]   Fig. 4. Calculation of the annual damping depth (cm) under (a) pine, (b) oak, and (c) chamise, by the relationship T = ln(2A) + z/d (Jury et al., 1991), where A = amplitude, z = depth, and d is the inverse slope of the regression line.

View larger version (32K): [in a new window]   Fig. 5. Monthly average volumetric water content with depth and the amount of rain (cm) received during each month for 1997 and 1998 under (a) pine, (b) oak, and (c) chamise.

View larger version (22K): [in a new window]   Fig. 6. Monthly precipitation and water storage within the top 65 cm of soil under pine, oak, and chamise for 1997 and 1998.