Ontl & Schulte (2012)
Also: Ontl & Schulte 2012
Soil carbon storage
Ontl, T. A., & Schulte, L. A. (2012). Soil carbon storage. Nature Education Knowledge, 3(10). Link to PDF
References
All IPCC definitions taken from Climate Change 2007: The Physical Science Basis. Working Group I Contribution to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Annex I, Glossary, pp. 941-954. Cambridge University Press.