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Carbon and Nitrogen Reserve Remobilization Following Defoliation

Nitrogen and Elevated CO₂ Effects

^a USDA, ARS, Pasture Systems & Watershed Management Research Laboratory, Building 3702 Curtin Road, University Park, PA 16802 USA
^b USDA, ARS, Rangeland Resources Research Unit, Crops Research Laboratory, 1701 Center Avenue, Ft. Collins, CO 80526 USA
^c USDA, ARS, Northern Great Plains Research Laboratory, P.O. Box 459, Mandan, ND 58554 USA

View larger version (40K): [in a new window]   Fig. 1 Changes in the concentration and content of total nonstructural carbohydrate (TNC) reserves in the roots and crowns of alfalfa, blue grama, and western wheatgrass during the first 20 d following defoliation. Concentrations are expressed on a structural dry weight (sdw) basis. Error bars represent ±1 SE

View larger version (41K): [in a new window]   Fig. 2 Effect of N fertilization and elevated CO2 on the concentration and content of soluble N compounds (buffer soluble protein and low molecular weight N) from roots and crowns of defoliated forages. Concentrations are expressed on a structural dry weight (sdw) basis. Error bars represent ±1 SE