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Long-Term Effects of Clipping and Nitrogen Management in Turfgrass on Soil Organic Carbon and Nitrogen Dynamics

The CENTURY Model Simulation

^a Department of Horticulture and Landscape Architecture, Colorado State University, Fort Collins, CO 80523-1173
^b Natural Resource Ecology Laboratory (NREL), Colorado State University, Fort Collins, CO 80523-1173
^c Northern Colorado Water Conservancy District, Loveland, CO 80539
^d University of California Cooperative Extension, Alameda, CA 94502
^e USDA-ARS, Soil–Plant–Nutrient Research Unit, Fort Collins, CO 80522

View larger version (43K): [in a new window]   Fig. 1. Comparison of measured and CENTURY-simulated (A) annual accumulative clipping yields and (B) monthly clipping yields collected from a field study in Colorado. Kentucky bluegrass was managed under typical home lawn conditions.

View larger version (26K): [in a new window]   Fig. 2. The CENTURY-simulated long-term effects of clipping management and nitrogen fertilization rate on (A) aboveground biomass, (B) soil organic carbon, and (C) soil organic nitrogen.

View larger version (27K): [in a new window]   Fig. 3. The CENTURY-simulated nitrate leaching under four management scenarios.

View larger version (33K): [in a new window]   Fig. 4. The CENTURY-simulated annual aboveground biomass under two management scenarios: (A) clippings returned and annual fertilization rates of 150, 100, 75, and 60 kg N ha-1 during 1 to 10, 11 to 25, 26 to 50, and 51 to 100 yr after turfgrass establishment, respectively; and (B) clippings removed and annual fertilization rates of 200, 150, and 140 kg N ha-1 for the periods of 1 to 10, 11 to 50, and 51 to 100 yr after turfgrass establishment, respectively.