Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/19142
Title: Drivers of soil organic carbon storage and vertical distribution in Eastern Australia
Contributor(s): Hobley, Nellie  (author); Wilson, Brian  (author)orcid ; Wilkie, Arjan (author); Gray, Jonathan (author); Koen, Terry (author)
Publication Date: 2015
DOI: 10.1007/s11104-015-2380-1
Handle Link: https://hdl.handle.net/1959.11/19142
Abstract: Aims: Drivers of soil organic carbon (SOC) storage are likely to vary in importance in different regions and at different depths due to local factors influencing SOC dynamics. This paper explores the factors influencing SOC to a depth of 30 cm in eastern Australia. Methods: We used a machine learning approach to identify the key drivers of SOC storage and vertical distribution at 1401 sites from New South Wales, Australia. We then assessed the influence of the identified factors using traditional statistical approaches. Results: Precipitation was important to and positively associated with SOC content, whereas temperature was important to and negatively associated with SOC vertical distribution. The importance of geology to SOC content increased with increasing soil depth. Land-use was important to both SOC content and its vertical distribution. Conclusion: We attribute these results to the influence of precipitation on primary production controlling SOC content, and the stronger influence of temperature on microbial activity affecting SOC degradation and vertical distribution. Geology affects SOC retention below the surface. Land-use controls SOC via production, removal and vertical mixing. The factors driving SOC storage are not identical to those driving SOC vertical distribution. Changes to these drivers will have differential effects on SOC storage and depth distribution.
Publication Type: Journal Article
Source of Publication: Plant and Soil, 390(1-2), p. 111-127
Publisher: Springer Netherlands
Place of Publication: Dordrecht, The Netherlands
ISSN: 0032-079X
1573-5036
Field of Research (FOR): 050301 Carbon Sequestration Science
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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