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https://hdl.handle.net/1959.11/30631
Title: | Poorly crystalline iron and aluminium oxides contribute to the carbon saturation and sorption of dissolved organic carbon in the soil | Contributor(s): | Khandakar, Tania (author); Guppy, Christopher (author) ; Rabbi, Sheikh M F (author); Daniel, Heiko (author) | Publication Date: | 2021-01 | Early Online Version: | 2020-10-12 | DOI: | 10.1111/sum.12662 | Handle Link: | https://hdl.handle.net/1959.11/30631 | Abstract: | Soil carbon (C) saturation implies an upper limit to a soil's capacity to store C depending on the contents of silt + clay and poorly crystalline Fe and Al oxides. We hypothesized that the poorly crystalline Fe and Al oxides in silt + clay fraction increased the C saturation and thus reduced the capacity of the soil to sorb additional C input. To test the hypothesis, we studied the sorption of dissolved organic carbon (DOC) on silt + clay fractions (<53 µm) of highly weathered oxic soils, collected from three different land uses (i.e., improved pasture, cropping and forest). Soils with high carbon saturation desorbed 38% more C than soils with low C saturation upon addition of DOC, whereas adsorption of DOC was only observed at higher concentration (>15 g kg−1). While high Al oxide concentration significantly increased both the saturation and desorption of DOC, the high Fe oxide concentration significantly increased the desorption of DOC, supporting the proposition that both oxides have influence on the DOC sorption in soil. Our findings provide a new insight into the chemical control of stabilization and destabilization of DOC in soil. | Publication Type: | Journal Article | Source of Publication: | Soil Use and Management, 37(1), p. 120-125 | Publisher: | Wiley-Blackwell Publishing Ltd | Place of Publication: | United Kingdom | ISSN: | 1475-2743 0266-0032 |
Fields of Research (FoR) 2008: | 050301 Carbon Sequestration Science 050304 Soil Chemistry (excl. Carbon Sequestration Science) |
Fields of Research (FoR) 2020: | 410101 Carbon sequestration science 410604 Soil chemistry and soil carbon sequestration (excl. carbon sequestration science) |
Socio-Economic Objective (SEO) 2008: | 960904 Farmland, Arable Cropland and Permanent Cropland Land Management 960906 Forest and Woodlands Land Management |
Socio-Economic Objective (SEO) 2020: | 180607 Terrestrial erosion 180603 Evaluation, allocation, and impacts of land use |
Peer Reviewed: | Yes | HERDC Category Description: | C1 Refereed Article in a Scholarly Journal |
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Appears in Collections: | Journal Article School of Environmental and Rural Science |
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