Articles | Volume 3, issue 1
SOIL, 3, 17–30, 2017
SOIL, 3, 17–30, 2017

Original research article 05 Jan 2017

Original research article | 05 Jan 2017

Timescales of carbon turnover in soils with mixed crystalline mineralogies

Lesego Khomo et al.

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Cited articles

Bern, C. R., Chadwick, O. A., Hartshorn, A. S., Khomo, L. M., and Chorover J.: A mass-balance model to separate and quantify colloidal and solute redistributions in soil, Chem. Geol., 282, 113–119, 2011.
Buettner, S. W., Kramer, M. G., Chadwick, O. A., and Thompson, A.: Mobilization of colloidal carbon during iron reduction in basaltic soils, Geoderma, 221–222, 139–145, 2014.
Castanha, C., Trumbore, S., and Amundson, R. G.: Methods of separating soil carbon pools affect the chemistry and turnover time of isolated fractions, Radiocarbon 50, 83–97, 2008.
Chadwick, O. A., Roering, J. J., Heimsath, A. M., Levick, S. R., Asner, G. P., and Khomo, L. M.: Shaping post-orogenic landscapes by climate and chemical weathering, Geology, 41, 1171–1174, 2013.
Chorover, J., Amistadi, M. K., and Chadwick, O. A.: Surface charge evolution of mineral-organic complexes during pedogenesis in Hawaiian basalt, Geochim. Cosmochim. Ac., 68, 459–476, 2004.
Short summary
We evaluated mineral control of organic carbon dynamics by relating the content and age of carbon stored in soils of varied mineralogical composition found in the landscapes of Kruger National Park, South Africa. Carbon associated with smectite clay minerals, which have stronger surface–organic matter interactions, averaged about a thousand years old, while most soil carbon was only decades to centuries old and was associated with iron and aluminum oxide minerals.