Changes in chemical and thermal indices of soil organic matter stability with time – method validation using a controlled incubation study

Dr Adam Gillespie1, Dr Amanda Diochon2, Dr Omid Haeri-Ardakani3, Dr Ed Gregorich4

1University Of Guelph, Guelph, Canada, 2Lakehead University, Thunder Bay, Canada, 3Geological Survey of Canada, Calgary, Canada, 4Agriculture and Agri-Food Canada, Ottawa, Canada

Soil organic matter stability is thought to be influenced by a combination of physical and chemical constraints.  We have seen relationships between thermal analysis and the carbon mineralization potential of a microbial community1,2,3.  In addition, chemical information obtained using spectroscopic methods (synchrotron-based XANES) can also be used to learn how C is stabilized in soils.  This study shows results of a controlled incubation study4 to track, over time, the changes in thermal stability using Rock-eval pyrolysis and XANES measurements of a soil incubated for the equivalent of 21 months of accumulated crop heat units in the Ottawa area.


Adam Gillespie is a new faculty member at the University of Guelph’s School of Environmental Sciences in Canada.  He is a soil chemist with a research focus on soil organic matter characterization, mapping and modelling. He has a strong interest in using innovative research and instrumentation to link land management with soil health and sustainable land use.


7th International Symposium
Soil Organic Matter

6 – 11 October 2019

Hilton Adelaide

Adelaide, South Australia


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