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Carbon-13 Fractionation of Relic Soil Organic Carbon during Mineralization Effects Calculated Half-Lives

^a Plant Science Dep., South Dakota State Univ., Brookings, SD 57007
^b USDA-ARS, Dep. of Soil, Water, and Climate, Univ. of Minnesota, St. Paul, MN 55108
^c Former Research Associate at South Dakota State Univ.

View larger version (65K): [in this window] [in a new window]   Fig. 1. The influence of the type of plant [(a) C4 and (b) C3] growing at a site and 13C fractionation (e) during the mineralization of fresh unharvested biomass returned to soil and soil organic C (SOC) on the calculated half-life of relic SOC.

View larger version (70K): [in this window] [in a new window]   Fig. 2. The influence of plant type [(a) C4 and (b) C3] and 13C fractionation during the mineralization of fresh unharvested biomass returned to soil and relic soil organic C (SOC) on the amount of fresh plant C retained (PCR) in the soil after mineralization.

View larger version (37K): [in this window] [in a new window]   Fig. 3. Diagram showing the impact of plant type (C3 and C4 plants) and 13C fractionation (Rayleigh fractionation coefficeint = 0 and < 0) on the relative pool sizes of relic soil organic C (SOC) and unharvested biomass remaining in soil after mineralization. PCR = plant C retained.