Rapid exchange between soil carbon and atmospheric carbon dioxide driven by temperature change

Proceedings of the National Academy of Sciences, 1997

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1994

Executive Summary Climate is, in many instances, the dominant variable controlling the storage of carbon in soils. It has proven difficult, however to determine how soil properties influenced by climate, such as soil temperature and soil moisture, actually operate to determine the rates of accumulation and decomposition of soil organic matter.

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Radiocarbon, 2008

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Global Biogeochemical Cycles, 2002

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Global Biogeochemical Cycles, 2005

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Canadian Journal of Soil Science

Improving the capacity to predict changes in soil carbon (C) stocks in the Canadian boreal forest requires better information on the characteristics and age of soil carbon, especially more slowly cycling C in mineral soil. We characterized C in the silt-size fraction, as representative of C stabilized by mineral association, previously isolated in a study of soil profiles of four sandy boreal jack pine sites. Silt-size fraction accounted for 13-31% of the total soil C and 12-51% of the total soil N content. Solid-state 13C nuclear magnetic resonance spectroscopy showed that silt C was mostly dominated by alkyl and O,N-alkyl C, with low proportions of aryl C in most samples. Thus, despite the importance of fire in this region, there was little evidence of storage of pyrogenic C. We used HCl hydrolysis to isolate the oldest C within the silt-size fraction. Consistent with previous studies, this procedure removed 21-74% of C and 74-93% of N, leaving residues composed mainly of alkyl an...

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Global Biogeochemical …, 1995

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Limnology and Oceanography, 2015

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2011

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