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Soil Organic Carbon Pools After 12 Years in No-Till Dryland Agroecosystems

^a Great Plains Systems Res. Unit, USDA-ARS, P.O. Box E, Fort Collins, CO 80522
^b Dep. of Soil and Crop Science, Colorado State Univ., Fort Collins, CO 80523

View larger version (20K): [in a new window]   Fig. 1. Particulate organic matter C (POM-C) in the 0- to 10-cm depth. Means followed by a different letter are statistically different (P < 0.05) using Fisher's LSD.

View larger version (21K): [in a new window]   Fig. 2. Relationships of soil microbial biomass C (SMBC), particulate organic matter C (POM-C), and mineral-associated organic C (MAOC), in the 0- to 10-cm soil depth to whole soil organic C (SOC) after 12 yr in no-till management averaged across PET sites, slope positions, and cropping systems.

View larger version (13K): [in a new window]   Fig. 3. Interaction of potential evapotranspiration (PET) and cropping intensity on the percent of soil microbial biomass carbon (SMBC) found in soil organic carbon (SOC) in the 0- to 10-cm soil depth after 12 yr under no-till management. Means followed by a different letter are statistically different (P < 0.05) using Fisher's LSD.