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https://hdl.handle.net/2440/121021
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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 1873-3336 |
Statement of Responsibility: | 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 Respiration Soil clay fractions Wheat plant residue |
Rights: | © 2019 Elsevier B.V. All rights reserved. |
DOI: | 10.1016/j.jhazmat.2019.03.135 |
Grant ID: | http://purl.org/au-research/grants/arc/DP140100323 |
Published version: | http://dx.doi.org/10.1016/j.jhazmat.2019.03.135 |
Appears in Collections: | Agriculture, Food and Wine publications Aurora harvest 4 |
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