Carbon chemistry and mineralization of peat soils from the Australian Alps

Grover, S and Baldock, J 2012, 'Carbon chemistry and mineralization of peat soils from the Australian Alps', European Journal of Soil Science, vol. 63, no. 2, pp. 129-140.


Document type: Journal Article
Collection: Journal Articles

Title Carbon chemistry and mineralization of peat soils from the Australian Alps
Author(s) Grover, S
Baldock, J
Year 2012
Journal name European Journal of Soil Science
Volume number 63
Issue number 2
Start page 129
End page 140
Total pages 12
Publisher Wiley-Blackwell Publishing
Abstract The carbon chemistry of 10 profiles of peat soil has been described in detail using 13 C nuclear magnetic resonance (NMR) spectroscopy. The changes with depth in the allocation of signal to different carbon functional groups were consistent with an increase in the extent of decomposition (EOD) of the organic material with depth. This increase in EOD with depth is typical of peat soils. Incubation experiments were carried out on peats spanning the range of EODs encountered, to investigate the effect upon mineralization of substrate quality (as defined by 13 C NMR spectroscopy), water content and particle size. The confounding factors of depth, water content, bulk density, aeration and carbon content were eliminated by incubating ground peat material in a sand matrix. The size of the mineralizable carbon pool and the rate of carbon mineralization were both significantly affected by substrate quality, water content and particle size. Substrate quality had the greatest effect upon the size of the mineralizable carbon pool: as substrate quality decreased, so too did the size of the mineralizable carbon pool. Water content had the greatest effect upon the rate of carbon mineralization, which increased and then decreased as water content increased, with a maximum rate constant at a volumetric water content of 0.37 cm 3 cm -3 .
DOI - identifier 10.1111/j.1365-2389.2011.01424.x
Copyright notice © 2012 The Authors
ISSN 1351-0754
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