Decomposition of soil organic matter as affected by clay types, pedogenic oxides and plant residue addition rates
- Authors
- Singh, Mandeep; Sarkar, Binoy; Bolan, Nanthi S.; Ok, Yong Sik; Churchman, Gordon Jock
- Issue Date
- 15-7월-2019
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Soil clay fractions; Wheat plant residue; Respiration; Organic carbon stabilisation; Microbial activity
- Citation
- JOURNAL OF HAZARDOUS MATERIALS, v.374, pp.11 - 19
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF HAZARDOUS MATERIALS
- Volume
- 374
- Start Page
- 11
- End Page
- 19
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/64108
- DOI
- 10.1016/j.jhazmat.2019.03.135
- ISSN
- 0304-3894
- 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 m(2) 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.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - College of Life Sciences and Biotechnology > Division of Environmental Science and Ecological Engineering > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.