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Use of Carbon-13 and Carbon-14 to Measure the Effects of Carbon Dioxide and Nitrogen Fertilization on Carbon Dynamics in Ponderosa Pine

^a Dep. of Crop and Soil Sciences, Michigan State Univ., East Lansing, MI 48824-1325 USA
^b Environmental Studies Dep., Univ. of California, Santa Cruz, CA 95064 USA
^c Earth and Ecosystem Science, Desert Research Institute, 2215 Raggio Parkway, Reno, NV 89512 USA
^d Biological Science Center, Desert Research Institute, Reno, NV 89512 USA

View larger version (35K): [in a new window]   Fig. 1 Carbon dioxide-C mg kg-1 soil mineralized in Placerville, CA ( ± 1 SE)

View larger version (18K): [in a new window]   Fig. 2 Dynamics of 13C root derived soil organic carbon in the absence and presence of N, Placerville, CA