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REVIEW
Contents Vol 47(8)

Processes and magnitude of CO2, CH4, and N2O fluxes from liming of Australian acidic soils: a review

K. L. Page A , D. E. Allen A , R. C. Dalal A C and W. Slattery B
+ Author Affiliations
- Author Affiliations

A Department of Natural Resources and Water, 80 Meiers Rd, Indooroopilly, Qld 4068, Australia.

B Department of Climate Change, Canberra, ACT 2601, Australia.

C Corresponding author. Email: ram.dalal@derm.qld.gov.au

Australian Journal of Soil Research 47(8) 747-762 https://doi.org/10.1071/SR09057
Submitted: 2 April 2009  Accepted: 3 August 2009   Published: 11 December 2009

Abstract

Increases in soil acidification have led to large increases in the application of aglime to Australian agricultural soils. The addition of aglime has the potential to increase greenhouse gas (GHG) emissions due to the release of CO2 during the chemical dissolution of aglime and due to pH-induced changes to soil biological processes. Currently, Australia’s GHG accounting system assumes that all the carbon contained in aglime is released to the atmosphere during dissolution in accordance with the Tier 1 methodology of the IPCC. However, a recent approach by TO West and AC McBride has questioned this assumption, hypothesising that a proportion of the carbon from riverine-transported aglime may be sequestered in seawater. In addition, there is presently no capacity within Australia’s carbon accounting system to quantify changes to GHG emissions from lime-induced changes to soil biological processes. Therefore, the primary objective of this review was to examine the chemical and biological processes occurring during the application of aglime and the subsequent fluxes in CO2, N2O, and CH4 from soil, with particular reference to the Australian environment. Estimates for CO2 emissions from aglime application in Australia using the contrasting methodologies of the IPCC and West and McBride were compared. Using the methodology of the IPCC it was determined that from the aglime applied in Australia in 2002, 0.995 Tg of CO2 would have been emitted, whereas this figure was reduced to 0.659–0.860 Tg of CO2 using the methodology of West and McBride. However, the accuracy of these estimates is currently limited by poor understanding of the manner in which aglime moves within the Australian landscapes. In addition, there are only a very small number of Australian studies that have examined the effect of aglime on GHG emissions due to changes in soil biological processes, limiting the ability of Australian modellers to accurately incorporate these processes within the carbon accounting system.


Acknowledgments

The authors thank the Department of Climate Change for funding provided for this project, Dr Gary Richards for initial ideas and support of the project, and Dr Jeff Baldock for numerous suggestions at the initiation of the project. Contributions to the project by Iain Gibson and Phil Moody are also gratefully acknowledged.


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