Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 11 April 2006
Published in Agron J 98:443-450 (2006)
DOI: 10.2134/agronj2005.0066
© 2006 American Society of Agronomy
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Right arrow Isotopes
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Theoretical Derivation of Stable and Nonisotopic Approaches for Assessing Soil Organic Carbon Turnover

D. E. Claya,*, C. G. Carlsona, S. A. Claya, C. Reesea, Z. Liua, J. Changa and M. M. Ellsburyb

a Plant Science Dep., South Dakota State Univ., Brookings, SD 57007
b USDA-ARS, Northern Grain Insect Research Lab., Brookings, SD 57006


Figure 1
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  		Fig. 1. The location of the elevation-zone boundaries in the field.

 

Figure 2
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  		Fig. 2. Semivariograms for SOC (soil organic C) and soil 13C discrimination for 1995. Units for SOC are kilograms C per hectare and units for 13C discrimination are per-thousand.

 

Figure 3
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  		Fig. 3. The change in soil 13C discrimination ({per thousand}) from 1995 to 2003.

 

Figure 4
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  		Fig. 4. The influence of sampling date and elevation zone on SOC (soil organic C) derived from C3 and C4 plants. Brackets represent the t value at the 0.1 significance level.

 




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Journal of Natural Resources
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Environmental Quality		 The Plant Genome
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