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RESEARCH ARTICLE
Contents Vol 31(1)

Scenario analysis of alternative vegetation management options on the greenhouse gas budget of two grazing businesses in north-eastern Australia

S. G. Bray A C and R. Golden B
+ Author Affiliations
- Author Affiliations

A Department of Primary Industries and Fisheries (DPI&F), PO Box 6014, Rockhampton MC, Qld 4702, Australia.

B ‘Potters Flat’, Wandoan, Qld 4419, Australia.

C Corresponding author. Email: steven.bray@dpi.qld.gov.au

The Rangeland Journal 31(1) 137-142 https://doi.org/10.1071/RJ08055
Submitted: 13 October 2008  Accepted: 9 February 2009   Published: 26 March 2009

Abstract

The emerging carbon economy will have a major impact on grazing businesses because of significant livestock methane and land-use change emissions. Livestock methane emissions alone account for ~11% of Australia’s reported greenhouse gas emissions. Grazing businesses need to develop an understanding of their greenhouse gas impact and be able to assess the impact of alternative management options. This paper attempts to generate a greenhouse gas budget for two scenarios using a spread sheet model.

The first scenario was based on one land-type ‘20-year-old brigalow regrowth’ in the brigalow bioregion of southern-central Queensland. The 50 year analysis demonstrated the substantially different greenhouse gas outcomes and livestock carrying capacity for three alternative regrowth management options: retain regrowth (sequester 71.5 t carbon dioxide equivalents per hectare, CO2-e/ha), clear all regrowth (emit 42.8 t CO2-e/ha) and clear regrowth strips (emit 5.8 t CO2-e/ha). The second scenario was based on a ‘remnant eucalypt savanna-woodland’ land type in the Einasleigh Uplands bioregion of north Queensland. The four alternative vegetation management options were: retain current woodland structure (emit 7.4 t CO2-e/ha), allow woodland to thicken increasing tree basal area (sequester 20.7 t CO2-e/ha), thin trees less than 10 cm diameter (emit 8.9 t CO2-e/ha), and thin trees <20 cm diameter (emit 12.4 t CO2-e/ha).

Significant assumptions were required to complete the budgets due to gaps in current knowledge on the response of woody vegetation, soil carbon and non-CO2 soil emissions to management options and land-type at the property scale. The analyses indicate that there is scope for grazing businesses to choose alternative management options to influence their greenhouse gas budget. However, a key assumption is that accumulation of carbon or avoidance of emissions somewhere on a grazing business (e.g. in woody vegetation or soil) will be recognised as an offset for emissions elsewhere in the business (e.g. livestock methane). This issue will be a challenge for livestock industries and policy makers to work through in the coming years.

Additional keywords: carbon, livestock methane, regrowth, savanna woodland, soil.


References


ABS (2005). ‘Year Book Australia 2005.’ (Australian Bureau of Statistics: Canberra.)

AGO (2007). ‘State and Territory Greenhouse Gas Inventories 2005.’ (Australian Greenhouse Office: Canberra.)

Ash A. J. , Howden S. M. , and McIvor J. G. (1995). Improved rangeland management and its implications for carbon sequestration. In: ‘5th International Rangeland Congress’. pp. 19–20. (Society for Range Management: Denver, CO.)

Back P. V., Anderson E. R., Burrows W. H., Playford C. (2009) Woody plant responses to various clearing strategies imposed on a poplar box (Eucalyptus populnea) community at Dingo in central Queensland. Tropical Grasslands (in press). , open url image1

Bradley M. (2006). Integration of brigalow (Acacia harpophylla) vegetation with dryland cropping in south-east Queensland: agronomic, hydrological, ecological and Goethean perspectives. PhD Thesis, Griffith University, Gold Coast, Queensland, Australia.

Bray S. G. , Krull E. S. , Harms B. P. , Baxter N. , Rutherford M. , Yee M. , and Cogle L. (2006). Assessment of vegetation change in the Burdekin Catchment of Queensland – Project Report, QI06091. Department of Primary Industries and Fisheries, Queensland.

Burrows W. H., Henry B. K., Back P. V., Hoffmann M. B., Tait L. J., Anderson E. R., Menke N., Danaher T., Carter J. O., McKeon G. M. (2002) Growth and carbon stock change in eucalypt woodlands in northeast Australia: ecological and greenhouse sink implications. Global Change Biology 8, 769–784.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Burrows W. H., Hoffmann M. B., Compton J. F., Back P. V., Tait L. J. (2000) Allometric relationships and community biomass estimates for some dominant eucalypts in Central Queensland woodlands. Australian Journal of Botany 48, 707–714.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Carter J. , and Fraser G. (2009). 0–5 cm Soil Carbon Trends with Removal of Domestic Stock: an Analysis of Data from 12 Grazing Exclosures. Appendix 2. In: ‘Prognosis for Carbon Sequestration in Rangelands upon Destocking. A case study of the vast Australian Rangelands with reference to biogeochemistry, ecology, fire, biodiversity and climate change’. (Eds C. Dean, R. J. Harper and D. J. Eldridge.) pp. 156–165.(Rural Industries Research and Development Corporation: Barton, ACT.)

Dalal R. C., Allen D. E. (2008) Greenhouse gas fluxes from natural ecosystems. Turner Review No. 18. Australian Journal of Botany 56, 369–407.
| Crossref | GoogleScholarGoogle Scholar | CAS | open url image1

DCC (2008). ‘National Inventory Report 2006 – Vol. 1.’ (Department of Climate Change, Australian Government: Canberra.)

DPI&F (2004). ‘Stocktake: Balancing supply and demand.’ (Department of Primary Industries and Fisheries, Queensland: Brisbane.)

Fensham R. J. (2005) Monitoring standing dead wood for carbon accounting in tropical savanna. Australian Journal of Botany 53, 631–638.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Fensham R. J., Bray S. G., Fairfax R. J. (2007) Evaluation of aerial photography for predicting trends in structural attributes of Australian woodland including comparison with ground-based monitoring data. Journal of Environmental Management 83, 392–401.
| Crossref | GoogleScholarGoogle Scholar | PubMed | open url image1

Fensham R. J., Low Choy S. J., Fairfax R. J., Cavallaro P. C. (2003) Modelling trends in woody vegetation structure in semi-arid Australia as determined from aerial photography. Journal of Environmental Management 68, 421–436.
| Crossref | GoogleScholarGoogle Scholar | PubMed | open url image1

Harms B. , and Dalal R. (2003). Paired site sampling for soil carbon (and nitrogen) estimation – Queensland. National Carbon Accounting System Technical Report No. 37. Australian Greenhouse Office, Canberra.

Harris S. , and Narayanaswamy V. (2009). ‘Methodology for Agricultural Life Cycle Assessment in Australia.’ (Rural Industries Research and Development Corporation: Barton, ACT.)

IPCC (2000). ‘IPCC Special report on land use, land-use change and forestry. Intergovernmental Panel on Climate Change.’ (Cambridge University Press: Cambridge, UK.)

Kennedy P. , Stephens M. , and Charmley E. (2007). Managing livestock to reduce methane emissions in northern Australia – development of a modelling framework. Final Report Project 0139. Australian Greenhouse Office, Canberra.

McKeon G. , Chilcott C. , McGrath W. , Paton C. , Fraser G. , Stone G. , and Ryan J. (2008). Assessing the value of trees in sustainable grazing systems. Final Report NBP.316. Meat and Livestock Australia.

Scanlan J. C. (1991) Woody overstorey and herbaceous understorey biomass in Acacia harpophylla (brigalow) woodlands. Australian Journal of Ecology 16, 521–529.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Scanlan J. C. (2002) Some aspects of tree-grass dynamics in Queensland’s grazing lands. The Rangeland Journal 24, 56–82.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Vegetation Management Act (1999). Vegetation Management Act 1999. Queensland Government.