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Sensitivity of the Century Model to Scale-Related Soil Texture Variability

^a Montana State Univ., 334 Leon Johnson Hall, P.O. Box 173120, Bozeman, MT 59717
^b Dep. of Land Resources and Environmental Sciences, Montana State Univ., Bozeman, MT 59717
^c Dep. of Mathematics and Statistics, Northern Arizona Univ., Flagstaff, AZ 86011
^d Dep. of Soil and Crop Sciences, Colorado State Univ., Fort Collins, CO 80521
^e Northern Rockies Soil and Water, Bozeman, MT 59715
^f Dep. of Land Resources and Environmental Sciences, Montana State Univ., Bozeman, MT 59717

View larger version (67K): [in this window] [in a new window]   Fig. 1. Agroecozones of the northern Great Plains (Padbury et al., 2002) showing the study area in north central Montana (in triangle).

View larger version (16K): [in this window] [in a new window]   Fig. 2. Implied C change (no-till C minus tilled C) for measured and modeled soil organic C (SOC) values using STATSGO reported clay content for Century model input at Chester, Conrad W, Ft. Benton, Simpson, and Saint Johns, MT, 2001.

View larger version (15K): [in this window] [in a new window]   Fig. 3. Regression of Century model estimates of soil organic C (SOC) change (no-till SOC minus tilled SOC) on observed SOC in north-central Montana, 2001.

View larger version (14K): [in this window] [in a new window]   Fig. 4. Mean of observational biases (measured soil organic C [SOC] minus Century estimated SOC) for no-till and tilled fields at Chester, Conrad W, Ft. Benton, Simpson, and St. Johns, MT, 2001. Solid line at zero represents no bias or perfect agreement. Dashed line at –2.3 is the mean bias.

View larger version (23K): [in this window] [in a new window]   Fig. 5. Measured and predicted soil organic C (SOC) values using the Century model for no-till and tilled fields using site-specific clay content and STATSGO reported clay content in 5% increments at Chester, Conrad W, Ft. Benton, Simpson, and Saint Johns, MT, 2001.

View larger version (18K): [in this window] [in a new window]   Fig. 6. Regression of clay content on Century model estimates of soil organic C (SOC) in no-till and tilled fields at Chester, Conrad W, Ft. Benton, Simpson, and Saint Johns, MT, 2001.