Evaluation of atmospheric CO2 sequestration by alkaline soils through simultaneous enhanced carbonation and biomass production

Maryol, Emohamed and Lin, Chuxia (2015) Evaluation of atmospheric CO2 sequestration by alkaline soils through simultaneous enhanced carbonation and biomass production. Geoderma, 241-242. pp. 24-31. ISSN 0016-7061

Abstract

A series ofmicrocosm experimentswere conducted. The objectives were to evaluate the effects of Ca/Mg-bearing
materials on CO2 sequestration in highly alkaline sodic soils (Sodosol) through carbonation and biomass production.
Application of gypsum resulted in an increase in inorganic carbon and a decrease in organic carbon. The addition of talc did not significantly enhance carbonate formation. Soluble CaCl2 and MgCl2 did not have significantly better effects on soil carbonation, as compared to gypsum. The one-year growth experiment using five widely cultivated pasture grasses revealed that accumulation of carbonates following gypsum application could be inhibited by plant growth; the organic acids secreted from plant roots were likely to facilitate soil carbonate dissolution. In comparison with pedogenic carbonation,carbon sequestration by biomass production was much more evident. However, the biomass carbon gain varied markedly among the five species with Digitaria eriantha showing the highest biomass carbon gain. This further enhanced the accumulation of soil organic carbon. At the end of the experiment, an estimated CO2 sequestering capacity of 93 t/ha was achieved. The research findings have implications for cost–benefit analysis of alkaline soil reclamation projects.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to published version in accordance with the copyright policy of the publisher. Article can be accessed via link to online version.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - No Department
Date Deposited: 06 May 2016 06:02
Last Modified: 05 Sep 2016 01:54
Uncontrolled Keywords: carbon sequestration; alkaline soil; biomass; gypsum; pedogenic carbonate; soil organic carbon
Fields of Research : 05 Environmental Sciences > 0503 Soil Sciences > 050301 Carbon Sequestration Science
Identification Number or DOI: 10.1016/j.geoderma.2014.10.015
URI: http://eprints.usq.edu.au/id/eprint/27605

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