Simulating trends in soil organic carbon in long-term experiments using the century model

This paper describes Century Soil Organic Matter (SOM) Model simulations of seven long-term data sets that are the subject of this special issue. We found that Century successfully simulates SOM C across a variety of land use and climate types. Simulations of SOM were most successful in grass and cr...

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Bibliographic Details
Published in:	Geoderma Vol. 81; no. 1; pp. 75 - 90
Main Authors:	Kelly, R.H., Parton, W.J., Crocker, G.J., Graced, P.R., Klír, J., Körschens, M., Poulton, P.R., Richter, D.D.
Format:	Journal Article
Language:	English
Published:	Elsevier B.V 01-12-1997
Subjects:	CENTURY model long-term experiments model comparison soil organic matter CENTURY model soil organic matter model comparison long-term experiments
Online Access:	Get full text
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Summary:	This paper describes Century Soil Organic Matter (SOM) Model simulations of seven long-term data sets that are the subject of this special issue. We found that Century successfully simulates SOM C across a variety of land use and climate types. Simulations of SOM were most successful in grass and crop systems. This exercise highlights a structural limitation of Century in simulating SOM in a forest with a developed litter layer. Simulations of tree biomass distributions, however, were generally successful. The model failed to capture extreme values of yield and N offtake, although annual averages were quite similar between observations and simulations, leading to reasonable estimates of SOM C. Average yields and SOM were generally higher in amended treatments or rotations including an N-fixing component such as alfalfa. The model successfully predicted SOM dynamics across climates, land use types, and treatments. This suggests that Century is a useful tool for ecosystem studies, particularly those focused on SOM dynamics.
ISSN:	0016-7061 1872-6259
DOI:	10.1016/S0016-7061(97)00082-7