Inorganic and organic carbon dynamics in a limed acid soil are mediated by plants

Ahmad, Waqar, Singh, Balwant, Dijkstra, Feike A. and Dalal, R. C. (2013) Inorganic and organic carbon dynamics in a limed acid soil are mediated by plants. Soil Biology and Biochemistry, 57 549-555. doi:10.1016/j.soilbio.2012.10.013

Author Ahmad, Waqar
Singh, Balwant
Dijkstra, Feike A.
Dalal, R. C.
Title Inorganic and organic carbon dynamics in a limed acid soil are mediated by plants
Journal name Soil Biology and Biochemistry   Check publisher's open access policy
ISSN 0038-0717
Publication date 2013-02
Year available 2012
Sub-type Article (original research)
DOI 10.1016/j.soilbio.2012.10.013
Open Access Status
Volume 57
Start page 549
End page 555
Total pages 7
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon Press
Collection year 2014
Language eng
Formatted abstract
Lime is commonly used to overcome soil acidification in agricultural production systems; however, its impact on inorganic and organic soil carbon dynamics remains largely unknown. In a column experiment, we monitored rhizosphere effects on lime dissolution, CO2 effluxes, and the concentrations of dissolved inorganic carbon (DIC) and dissolved organic carbon (DOC) in leachate from an acidic Kandosol. The experiment consisted of four treatments viz: soil only (control), soil + lime, soil + wheat, and soil + lime + wheat. We measured CO2-C effluxes at 7, 43 and 98 days after planting (DAP) and leachate was collected at 56 and 101 DAP. The soil CO2-C efflux rate increased significantly with lime addition at 7 and 43 DAP compared to control. At 43 DAP, the largest increase in CO2-C effluxes was observed in the lime + wheat treatment. However, at 98 DAP similar CO2-C effluxes were observed from wheat and lime + wheat treatments, suggesting that most of the lime was dissolved in the lime + wheat treatment. Both DOC and DIC concentrations in the leachate increased significantly with lime and wheat only treatments (cf. control). In contrast to DOC, there was an increase in the DIC concentration in the soil leachate from lime + wheat treatment columns at 101 DAP (significant wheat x lime interaction), thus, accentuating the pronounced role of wheat roots. We conclude that plant mediated dissolution of lime increased the concentration of DIC in the soil leachate, while both liming and presence of plants enhanced DOC leaching.
Keyword Liming
Carbon effluxes
Dissolved inorganic carbon
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online 2 November 2012

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Agriculture and Food Sciences
Official 2014 Collection
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