Temperature sensitivity and carbon release in an acidic soil amended with lime and mulch

Ahmad, Waqar, Singh, Balwant, Dijkstra, Feike A., Dalal, Ram C. and Geelan-Small, Peter (2014) Temperature sensitivity and carbon release in an acidic soil amended with lime and mulch. Geoderma, 214-215 168-176. doi:10.1016/j.geoderma.2013.09.014


Author Ahmad, Waqar
Singh, Balwant
Dijkstra, Feike A.
Dalal, Ram C.
Geelan-Small, Peter
Title Temperature sensitivity and carbon release in an acidic soil amended with lime and mulch
Journal name Geoderma   Check publisher's open access policy
ISSN 0016-7061
1872-6259
Publication date 2014-02
Year available 2013
Sub-type Article (original research)
DOI 10.1016/j.geoderma.2013.09.014
Open Access Status
Volume 214-215
Start page 168
End page 176
Total pages 9
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2014
Language eng
Formatted abstract
Lime is commonly applied on agricultural lands for ameliorating soil acidity. However, lime dissolution and its concomitant contribution to carbon dioxide (CO2) fluxes with the addition of organic residues at varying temperatures in acidic soils are not well known. We conducted laboratory incubation experiments for 96days (20+/-1°C and 40+/-1°C) to quantify the priming effects of lime (0.46 and 0.92% w/w) and mulch (0.5% w/w) additions on carbon (C) release in a Chromic Luvisol. The C released from lime (δ13C of -8.67‰), mulch (-13.02‰) and soil (-25.2‰) was quantified using their distinct δ13C values. Total lime derived C in soils without mulch constituted approximately 32% and 17% of the total C fluxes at 20°C and 40°C, respectively. During the 96-day incubation period, in the absence of mulch addition between 64% and 100% of the applied lime C was released as CO2 at both incubation temperatures. Furthermore, lime derived, mulch derived and soil derived C increased by 59, 48 and 284% respectively, when the incubation temperature was increased from 20°C to 40°C. These results suggest that mineralization of native soil C was more sensitive to temperature than the C released by lime dissolution and mulch mineralization. Temperature sensitivity of soil derived C was lower in treatments with mulch and lime addition compared to soil without C amendments. We obtained a Q10 value of 2.41±0.06 for the C released by the lime dissolution in the acidic soil. These findings are important for modelling the contribution of different C sources to atmospheric CO2 concentrations in soils, such as the acidic limed and mulched soils.
Keyword Acidic soil
Dissolution
Inorganic and organic carbon
Liming
Mulch
Q10
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

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