Journal article

Seasonal variation and fire effects on CH4, N2O and CO2 exchange in savanna soils of northern Australia

Stephen J Livesley, Samantha Grover, Lindsay B Hutley, Hizbullah Jamali, Klaus Butterbach-Bahl, Benedikt Fest, Jason Beringer, Stefan K Arndt



Tropical savanna ecosystems are a major contributor to global CO2, CH4 and N2O greenhouse gas exchange. Savanna fire events represent large, discrete C emissions but the importance of ongoing soil-atmosphere gas exchange is less well understood. Seasonal rainfall and fire events are likely to impact upon savanna soil microbial processes involved in N2O and CH4 exchange. We measured soil CO2, CH4 and N2O fluxes in savanna woodland (Eucalyptus tetrodonta/Eucalyptus miniata trees above sorghum grass) at Howard Springs, Australia over a 16 month period from October 2007 to January 2009 using manual chambers and a field-based gas chromatograph connected to automated chambers. The effect of fire o..

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Awarded by ARC

Funding Acknowledgements

This research was funded by an ARC Linkage project (LP0774812) and the Victorian Department of Sustainability and Environment. The authors would like to thank Bianca Baldissera for assistance in the field and sample processing in the laboratory and Dr. Suzanne Venn for assistance in the field. We would like to thank Andrew Edwards and Cameron Yates for assistance in the controlled (and uncontrolled) savanna burns. Similarly, thanks go to Matt Lee and Najib Ahmady of Creswick Laboratories at the University of Melbourne for their assistance in sample processing and analysis, and to Dr. Peter Isaac for providing flux tower soils data.