Please use this identifier to cite or link to this item:
https://hdl.handle.net/1959.11/19143
Title: | The depth distribution of organic carbon in the soils of eastern Australia | Contributor(s): | Hobley, Nellie (author); Wilson, Brian (author)![]() |
Publication Date: | 2016 | Open Access: | Yes | DOI: | 10.1002/ecs2.1214![]() |
Handle Link: | https://hdl.handle.net/1959.11/19143 | Abstract: | Subsurface soil organic carbon (SOC) is a large but still poorly understood component of the global carbon cycle. We investigated the depth distribution of SOC in eastern Australia, testing the hypotheses that SOC content near the surface is linked with water availability, whereas the distribution of SOC with depth is linked with land use, site factors and temperature. To do this, we measured SOC concentration to 1 m at 100 sites across eastern Australia, and fitted three parameter exponential depletion models to the results. Three machine learning algorithms were used to identify predictors important to the model parameters. Multiple regression models were then created based upon the machine learning results using bootstrapped stepwise regressions and the relative importance of the selected variables was assessed using proportional marginal variance decomposition. Surface SOC concentration was influenced predominantly by climate variables, of which seasonal rainfall was by far the most important. At depth, SOC storage was most influenced by site factors (mainly bulk density and soil type), and both land use and climate contributed similar amounts to model explained variance. The depth distribution of SOC was most influenced by land use, which accounted for ~60% of model explained variance, with site and climate factors being approximately equally important. These results support our hypotheses regarding the drivers of SOC depth distribution in eastern Australia and can be used to identify regions with the potential for additional subsurface soil carbon storage. | Publication Type: | Journal Article | Source of Publication: | Ecosphere, 7(1), p. 1-21 | Publisher: | Ecological Society of America | Place of Publication: | United States of America | ISSN: | 2150-8925 | Fields of Research (FoR) 2008: | 050301 Carbon Sequestration Science | Fields of Research (FoR) 2020: | 410601 Land capability and soil productivity 410101 Carbon sequestration science 410604 Soil chemistry and soil carbon sequestration (excl. carbon sequestration science) |
Socio-Economic Objective (SEO) 2008: | 961403 Forest and Woodlands Soils 961402 Farmland, Arable Cropland and Permanent Cropland Soils |
Socio-Economic Objective (SEO) 2020: | 180605 Soils | Peer Reviewed: | Yes | HERDC Category Description: | C1 Refereed Article in a Scholarly Journal |
---|---|
Appears in Collections: | Journal Article |
Files in This Item:
File | Description | Size | Format |
---|
SCOPUSTM
Citations
85
checked on Feb 8, 2025
Page view(s)
1,436
checked on Mar 24, 2024
Items in Research UNE are protected by copyright, with all rights reserved, unless otherwise indicated.