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Type: Journal article
Title: Decomposition of soil organic matter as affected by clay types, pedogenic oxides and plant residue addition rates
Author: Singh, M.
Sarkar, B.
Bolan, N.S.
Ok, Y.S.
Churchman, G.J.
Citation: Journal of Hazardous Materials, 2019; 374:11-19
Publisher: Elsevier
Issue Date: 2019
ISSN: 0304-3894
Statement of
Mandeep Singh, Binoy Sarkar, Nanthi S.Bolan, Yong Sik Ok, Gordon Jock Churchman
Abstract: The interactive effects of the types and contents of soil clay fractions (SCFs) and plant-residue addition rates on soil organic carbon (SOC) stabilisation are largely unknown. We conducted incubation experiments by amending a sandy soil sample with kaolinitic-illitic, smectitic and allophanic SCFs and adding wheat residues to the mineral mixtures to compare their C stabilisation capacity. The rate of carbon (C) decomposition was higher in the kaolinitic-illitic SCF followed by smectitic and allophanic clay minerals. The supply of easily degradable C substrate from decomposing residues markedly influenced the SCFs' abilities to stabilise SOC. The removal of sesquioxides from the SCFs significantly decreased their C stabilisation capacity, which coincided with a decrease in the dehydrogenase activity of the mineral-residue mixture. The allophanic SCF showed the least microbial activity and the greatest C stabilisation due to having a higher proportion of micropores (75%). The high C stabilisation capacity of allophanic SCF could also be explained by its high specific surface area (119 m2  g-1). The results of this study are helpful to understand the role of various SCFs in stabilising added C originating from external wheat residue addition but warrant further validation under field conditions.
Keywords: Microbial activity
Organic carbon stabilisation
Soil clay fractions
Wheat plant residue
Rights: © 2019 Elsevier B.V. All rights reserved.
DOI: 10.1016/j.jhazmat.2019.03.135
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Appears in Collections:Agriculture, Food and Wine publications
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