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Clay Minerals as the Key to the Sequestration of Carbon in Soils

Published online by Cambridge University Press:  01 January 2024

Gordon Jock Churchman ,
Mandeep Singh ,
Amanda Schapel ,
Binoy Sarkar  and
Nanthi Bolan
Gordon Jock Churchman*
Affiliation:
School of Agriculture, Food and Wine, University of Adelaide, Adelaide, SA 5005, Australia
Mandeep Singh
Affiliation:
Future Industries Institute, University of South Australia, Mawson Lakes, SA 5095, Australia
Amanda Schapel
Affiliation:
School of Agriculture, Food and Wine, University of Adelaide, Adelaide, SA 5005, Australia Primary Industries and Regions South Australia, Rural Solutions SA, SA 5000, Australia
Binoy Sarkar
Affiliation:
Lancaster Environment Centre, Lancaster University, Lancaster LA1 4YQ, UK
Nanthi Bolan
Affiliation:
Global Centre for Environmental Remediation, University of Newcastle, Callaghan, NSW 2308, Australia
*
*E-mail address of corresponding author: jock.churchman@adelaide.edu.au
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abstract

Results from earlier laboratory and field experiments were interrogated for the possibilities of sequestration, or long-term accumulation, of carbon from excess greenhouse gases in the atmosphere. In the laboratory study, samples of three (top) soils dominated by kaolinite and illite (together), smectite, and allophane were examined for the adsorption and desorption of dissolved organic carbon (DOC). Adsorption and desorption of DOC were carried out on clay fractions extracted physically and after first native organic matter and then iron oxides were removed chemically. Labeled organic material was added to the soils to assess the priming effect of organic carbon (OC). In the field, changes in OC were measured in sandy soils that had been amended by additions of clay for between 3 and 17 years, both through incorporation of exogenous clay and delving of in situ clay. The laboratory experiments demonstrated that a portion of DOC was held strongly in all soils. The amount of DOC adsorbed depended on clay mineral types, including Fe oxides. Much adsorbed DOC was lost by desorption in water and a substantial amount of native OC was lost on priming with new OC. Addition of clay to soils led to increased OC. Therefore, addition of clay to soil may enhance net sequestration of C. Organic carbon close to mineral surfaces or within microaggregates is held most strongly. Carbon sequestration may occur in subsoils with unsaturated mineral surfaces. However, incorporation of carbon into macroaggregates from enhanced plant growth might be most effective in removing excess carbon from the atmosphere, albeit over the short-term.

Keywords

AdsorptionClay amendmentDesorptionDelvingDissolved organic carbonPriming
Type
Original Paper
Information
Clays and Clay Minerals , Volume 68 , Issue 2 , April 2020 , pp. 135 - 143
Copyright
Copyright © Clay Minerals Society 2020

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