Aboveground and belowground carbon dynamics in response to fire regimes in the grazed rangelands of northern Australia: initial results from field studies and modelling
L. P. Hunt
+ Author Affiliations
- Author Affiliations
CSIRO Ecosystem Sciences and Sustainable Agriculture Flagship, PMB 44 Winnellie, NT 0822, Australia. Email: Leigh.Hunt@csiro.au
The Rangeland Journal 36(4) 347-358 https://doi.org/10.1071/RJ13123
Submitted: 13 December 2013 Accepted: 5 June 2014 Published: 24 September 2014
Abstract
The world’s rangelands are often seen as offering considerable potential as a carbon (C) sink, which could contribute to the management of atmospheric C levels, but there are often few data available to assess this potential or to inform the type of management regimes that would be necessary. This paper reports on a review of the literature, a field study and modelling of C stocks under a selection of experimental fire regimes in two plant communities in Australia’s northern rangelands. The field study on an open eucalypt savanna woodland and a savanna grassland-open shrubland suggested that fire regime had no effect or an inconsistent effect on aboveground C stocks. However, modelling using the Century model for the open woodland site showed that increasing fire frequency was associated with reduced aboveground and soil C stocks. Thus, while infrequent fires allowed C stocks to increase (10-yearly fire) or remain stable (6-yearly fire) over a modelled 58-year period, a regime of more frequent fires (4- and 2-yearly fires) reduced C stocks over time. Simulation of C dynamics over 93 years of pastoral settlement suggested that total C stocks had increased by 9.5 t ha–1, largely due to an increase in C in woody vegetation following a reduction in fire frequency associated with pastoral settlement. Frequent burning, as recommended to maintain low woody density and promote pasture production for grazing, will, therefore, reduce aboveground and to a lesser extent soil C stocks where there has been a history of infrequent fire. The opportunities for pastoralists to increase C stocks will depend on the frequency of fire and vegetation type, especially its woodiness or potential woodiness. Reducing fire frequency in woody rangelands will increase C stocks but may have adverse effects on pasture and livestock production. Reducing grazing pressure or destocking might also increase C stocks but may be relevant only when a property is overstocked or where relatively unproductive land could be taken out of livestock production. Any C gains from altering fire and grazing management are likely to be modest.
Additional keywords: carbon modelling, carbon stocks, Century, prescribed fire, savannas.
References
Allen, D. E., Pringle, M. J., Page, K. L., and Dalal, R. C. (2010). A review of sampling designs for the measurement of soil organic carbon in Australian grazing lands. The Rangeland Journal 32, 227–246.| A review of sampling designs for the measurement of soil organic carbon in Australian grazing lands.Crossref | GoogleScholarGoogle Scholar |
Allen, D. E., Pringle, M. J., Bray, S., Hall, T. J., O’Reagain, P. J., Phelps, D., Cobon, D. H., Bloesch, P. M., and Dalal, R. C. (2013). What determines soil organic carbon stocks in the grazing lands of north-eastern Australia? Soil Research 51, 695–706.
| What determines soil organic carbon stocks in the grazing lands of north-eastern Australia?Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3sXhvF2ktbbM&md5=3e269a4d310387c68e86c4090a04df61CAS |
Allen, D. E., Bloesch, P. M., Cowley, R. A., Orton, T. G., Payne, J. E., and Dalal, R. C. (2014). Impacts of fire on soil organic carbon stocks in a grazed semiarid tropical Australian savanna: accounting for landscape variability. The Rangeland Journal 36, 359–369.
Andrew, M. H. (1986). Use of fire for spelling monsoon tallgrass pasture grazed by cattle. Tropical Grasslands 20, 69–78.
Ash, A. J., Howden, S. M., and McIvor, J. G. (1995). Improved rangeland management and its implications for carbon sequestration. In: ‘Proceedings of the Fifth International Rangeland Congress’. Salt Lake City, Utah, July 1995. (Ed. N. E. West.) pp. 19–20. (Society for Range Management: Denver, CO.)
Asner, G. P., Archer, S., Hughes, R. F., Ansley, R. J., and Wessman, C. A. (2003). Net changes in regional vegetation cover and carbon storage in Texas drylands, 1937–1999. Global Change Biology 9, 316–335.
| Net changes in regional vegetation cover and carbon storage in Texas drylands, 1937–1999.Crossref | GoogleScholarGoogle Scholar |
ASRIS (2006). Australian Soil Resource Information System, Digital Atlas of Australian Soils. Available at: www.asris.csiro.au/themes/Atlas.html (accessed 15 March 2013).
Baldock, J. A., Sanderman, J., Macdonald, L. M., Puccini, A., Hawke, B., Szarvas, S., and McGowan, J. (2013). Quantifying the allocation of soil organic carbon to biologically significant fractions. Soil Research 51, 561–576.
| Quantifying the allocation of soil organic carbon to biologically significant fractions.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3sXhvF2ktbbL&md5=088c03fa20589d5dbaae824c0b4ae352CAS |
Bastin, G., and Allan, G. (2012). After the smoke has cleared: 2011 fire in central Australia. Range Management Newsletter 12/2, pp. 3–6. Australian Rangeland Society, Adelaide.
Booker, K., Huntsinger, L., Bartolome, J. W., Sayre, N. F., and Stewart, W. (2013). What can ecological science tell us about opportunities for carbon sequestration on arid rangelands in the United States? Global Environmental Change 23, 240–251.
| What can ecological science tell us about opportunities for carbon sequestration on arid rangelands in the United States?Crossref | GoogleScholarGoogle Scholar |
Bray, S. G., and Golden, R. (2009). Scenario analysis of alternative vegetation management options on the greenhouse gas budget of two grazing businesses in north-eastern Australia. The Rangeland Journal 31, 137–142.
| Scenario analysis of alternative vegetation management options on the greenhouse gas budget of two grazing businesses in north-eastern Australia.Crossref | GoogleScholarGoogle Scholar |
Bray, S., Harms, B., Fraser, G., and Rutherford, M. (2010). ‘Assessment of soil carbon stocks in response to land condition in Queensland’s northern grazing lands. Appendix A.’ Key to Healthy Savanna Lands Final Report. (Queensland Department of Employment, Economic Development and Innovation: Brisbane.)
Bremer, D. J., and Ham, J. M. (2010). Net carbon fluxes over burned and unburned native tallgrass prairie. Rangeland Ecology and Management 63, 72–81.
| Net carbon fluxes over burned and unburned native tallgrass prairie.Crossref | GoogleScholarGoogle Scholar |
Brown, J., Angerer, J., Salley, S. W., Blaisdell, R., and Stuth, J. W. (2010). Improving estimates of rangeland carbon sequestration potential in the US south-west. Rangeland Ecology and Management 63, 147–154.
| Improving estimates of rangeland carbon sequestration potential in the US south-west.Crossref | GoogleScholarGoogle Scholar |
Burrows, W. H., Henry, B. K., Back, P. V., Hoffman, M. B., Tait, L. J., Anderson, E. R., Menke, N., Danaher, T., Carter, J. O., and McKeon, G. M. (2002). Growth and carbon stock change in eucalypt woodlands in north-east Australia: ecological and greenhouse sink implications. Global Change Biology 8, 769–784.
| Growth and carbon stock change in eucalypt woodlands in north-east Australia: ecological and greenhouse sink implications.Crossref | GoogleScholarGoogle Scholar |
Chapin, F. S. III, Chapin, F. S. III, (2009). The changing global carbon cycle: linking plant-soil carbon dynamics to global consequences. Journal of Ecology 97, 840–850.
| The changing global carbon cycle: linking plant-soil carbon dynamics to global consequences.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD1MXhtFOktL7P&md5=4d51529325f43a4a50f819059d8f21b0CAS |
Conant, R. T., and Paustian, K. (2002). Spatial variability of soil organic carbon in grasslands: implications for detecting change at different scales. Environmental Pollution 116, S127–S135.
| Spatial variability of soil organic carbon in grasslands: implications for detecting change at different scales.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD38XhsFCh&md5=526e3287daf967a3a967fbcccca7c061CAS | 11833900PubMed |
Conant, R. T., Paustian, K., and Elliott, E. T. (2001). Grassland management and conversion into grassland effects on soil carbon. Ecological Applications 11, 343–355.
| Grassland management and conversion into grassland effects on soil carbon.Crossref | GoogleScholarGoogle Scholar |
Cook, G. D., Williams, R. J., Stokes, C. J., Hutley, L. B., Ash, A. J., and Richards, A. E. (2010). Managing sources and sinks of greenhouse gases in Australia’s rangelands and tropical savannas. Rangeland Ecology and Management 63, 137–146.
| Managing sources and sinks of greenhouse gases in Australia’s rangelands and tropical savannas.Crossref | GoogleScholarGoogle Scholar |
Cowley, T. C., Cowley, R. A., and Hearnden, M. N. (2011). Keep it hot but burn a bit more frequently to manage woody increase. In: ‘Proceedings, Northern Beef Research Update Conference’. August 2011, Darwin, NT. p.162. (North Australia Beef Research Council: Park Ridge, Qld.)
Cowley, R. A., Hearnden, M. H., Joyce, K. E., Tovar-Valencia, M., Cowley, T. M., Pettit, C. L., and Dyer, R. M. (2014). How hot? How often? Getting the fire frequency and timing right for optimal management of woody cover and pasture composition in northern Australian grazed tropical savannas. Kidman Springs Fire Experiment 1993–2013. The Rangeland Journal 36, 323–345.
Craig, A. B. (1999). Fire management of rangelands in the Kimberley low-rainfall zone: a review. The Rangeland Journal 21, 39–70.
| Fire management of rangelands in the Kimberley low-rainfall zone: a review.Crossref | GoogleScholarGoogle Scholar |
Dean, C., Wardell-Johnson, G. W., and Harper, R. J. (2012). Carbon management of commercial rangelands in Australia: major pools and fluxes. Agriculture, Ecosystems & Environment 148, 44–64.
| Carbon management of commercial rangelands in Australia: major pools and fluxes.Crossref | GoogleScholarGoogle Scholar |
Derner, J. D., and Schuman, G. E. (2007). Carbon sequestration and rangelands: a synthesis of land management and precipitation effects. Journal of Soil and Water Conservation 62, 77–85.
Dyer, R., and Stafford Smith, M. (2003). Ecological and economic assessment of prescribed burning impacts in semi-arid pastoral lands of northern Australia. International Journal of Wildland Fire 12, 403–413.
| Ecological and economic assessment of prescribed burning impacts in semi-arid pastoral lands of northern Australia.Crossref | GoogleScholarGoogle Scholar |
Dyer, R. M., Café, L. M., Cobiac, M., and Cowley, R. A. (2003). ‘Developing sustainable grazing management systems for the semi-arid tropics of the Northern Territory.’ Final Project Report NAP3.211. (Meat and Livestock Australia: Sydney, NSW.)
Eamus, D., McGuiness, K., and Burrows, W. (2000). ‘Review of allometric relationships for estimating woody biomass for Queensland, the Northern Territory and Western Australia.’ National Carbon Accounting System Technical Report No. 5a. (Australian Greenhouse Office: Canberra, ACT.)
Edwards, A., Hauser, P., Anderson, M., McCartney, M., Armstrong, M., Thackway, R., Allan, G., Hempel, C., and Russell-Smith, J. (2001). A tale of two parks: contemporary fire regimes of Litchfield and Nitmiluk National Parks, monsoonal northern Australia. International Journal of Wildland Fire 10, 79–89.
| A tale of two parks: contemporary fire regimes of Litchfield and Nitmiluk National Parks, monsoonal northern Australia.Crossref | GoogleScholarGoogle Scholar |
Eldridge, D. J., Bowker, M. A., Maestre, F. T., Roger, E., Reynolds, J. F., and Whitford, W. G. (2011). Impacts of shrub encroachment on ecosystem structure and functioning: towards a global synthesis. Ecology Letters 14, 709–722.
| Impacts of shrub encroachment on ecosystem structure and functioning: towards a global synthesis.Crossref | GoogleScholarGoogle Scholar | 21592276PubMed |
Follett, R. F., and Reed, D. A. (2010). Soil carbon sequestration in grazing lands: societal benefits and policy implications. Rangeland Ecology and Management 63, 4–15.
| Soil carbon sequestration in grazing lands: societal benefits and policy implications.Crossref | GoogleScholarGoogle Scholar |
Graetz, R. D., and Skjemstad, J. O. (2003). ‘The charcoal sink of biomass burning on the Australian continent.’ CSIRO Atmospheric Research. Technical Paper No. 64. Aspendale, Australia. (CSIRO: Canberra, ACT.)
Grice, A. C. (2008). ‘Developing, implementing and evaluating fire management of woody vegetation in the Gulf region.’ Final Report Project NBP.319. (Meat and Livestock Australia: Sydney, NSW.)
Hall, T. J., McIvor, J., Jones, P., MacLeod, N., McDonald, C., Reid, D., Smith, D., and Delaney, K. (2011). ‘Investigating intensive grazing systems in Northern Australia – Vol. I.’ MLA Final Report Project B.NBP.0353. (Meat and Livestock Australia: Sydney, NSW.)
Harms, B. P., Dalal, R. C., and Cramp, A. P. (2005). Changes in soil carbon and soil nitrogen after tree clearing in the semi-arid rangelands of Queensland. Australian Journal of Botany 53, 639–650.
| Changes in soil carbon and soil nitrogen after tree clearing in the semi-arid rangelands of Queensland.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD2MXht1GqsL7I&md5=ee152b7ff43975710ff312a08ed6e277CAS |
Henry, B. K., Danaher, T., McKeon, G. M., and Burrows, W. H. (2002). A review of the potential role of greenhouse gas abatement in native vegetation management in Queensland’s rangelands. The Rangeland Journal 24, 112–132.
| A review of the potential role of greenhouse gas abatement in native vegetation management in Queensland’s rangelands.Crossref | GoogleScholarGoogle Scholar |
Hunt, L. P., McIvor, J. G., Grice, A. C., and Bray, S. G. (2014). Principles and guidelines for managing cattle grazing in the grazing lands of northern Australia: stocking rates, pasture resting, prescribed fire, paddock size and water points. The Rangeland Journal 36, 105–119.
| Principles and guidelines for managing cattle grazing in the grazing lands of northern Australia: stocking rates, pasture resting, prescribed fire, paddock size and water points.Crossref | GoogleScholarGoogle Scholar |
Legge, S., Murphy, S., Kingswood, R., Maher, B., and Swan, D. (2011). EcoFire: restoring the biodiversity values of the Kimberley region by managing fire. Ecological Management & Restoration 12, 84–92.
| EcoFire: restoring the biodiversity values of the Kimberley region by managing fire.Crossref | GoogleScholarGoogle Scholar |
Lynch, B. (2002). ‘Pre-clearing soil carbon levels in the Northern Territory. Appendix 2.’ Pre-clearing Soil Carbon Levels in Australia – National Carbon Accounting System Technical Report No. 12. (Ed. A. Webb.) pp. 99–112. (Australian Greenhouse Office: Canberra, ACT.)
McSherry, M. E., and Ritchie, M. E. (2013). Effects of grazing on grassland soil carbon: a global review. Global Change Biology 19, 1347–1357.
| Effects of grazing on grassland soil carbon: a global review.Crossref | GoogleScholarGoogle Scholar | 23504715PubMed |
Northup, B. K., Brown, J. R., and Ash, A. J. (2005). Grazing impacts on spatial distribution of soil and herbaceous characteristics in an Australian tropical woodland. Agroforestry Systems 65, 137–150.
| Grazing impacts on spatial distribution of soil and herbaceous characteristics in an Australian tropical woodland.Crossref | GoogleScholarGoogle Scholar |
Parton, W. J., Schimel, D. S., Cole, C. V., and Ojima, D. S. (1987). Analysis of factors controlling soil organic matter levels in Great Plains grasslands. Soil Science Society of America Journal 51, 1173–1179.
| Analysis of factors controlling soil organic matter levels in Great Plains grasslands.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DyaL2sXmtlGnsbw%3D&md5=0bbb0982599ac72e6dd9f0db9e2582efCAS |
Percival, H. J., Parfitt, R. L., and Scott, N. A. (2000). Factors controlling soil carbon levels in New Zealand grasslands: is clay content important? Soil Science Society of America Journal 64, 1623–1630.
| Factors controlling soil carbon levels in New Zealand grasslands: is clay content important?Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD3cXntlGmurg%3D&md5=b71ff1443e04c409569143357d51cbc3CAS |
Piñeiro, G., Paruelo, J. M., and Oesterheld, M. (2006). Potential long-term impacts of livestock introduction on carbon and nitrogen cycling in grasslands of southern South America. Global Change Biology 12, 1267–1284.
| Potential long-term impacts of livestock introduction on carbon and nitrogen cycling in grasslands of southern South America.Crossref | GoogleScholarGoogle Scholar |
Piñeiro, G., Paruelo, J. M., Oesterheld, M., and Jobbágy, E. G. (2010). Pathways of grazing effects on soil organic carbon and nitrogen. Rangeland Ecology and Management 63, 109–119.
| Pathways of grazing effects on soil organic carbon and nitrogen.Crossref | GoogleScholarGoogle Scholar |
Pringle, M. J., Allen, D. E., Dalal, R. C., Payne, J. E., Mayer, D. G., O’Reagain, P., and Marchant, B. P. (2011). Soil carbon stock in the tropical rangelands of Australia: effects of soil type, and grazing pressure, and determination of sampling requirement. Geoderma 167–168, 261–273.
| Soil carbon stock in the tropical rangelands of Australia: effects of soil type, and grazing pressure, and determination of sampling requirement.Crossref | GoogleScholarGoogle Scholar |
Russell-Smith, J., Yates, C., Edwards, A., Allan, G. E., Cook, G. D., Cooke, P., Craig, R., Heath, B., and Smith, R. (2003). Contemporary fire regimes of northern Australia, 1997–2001: change since Aboriginal occupancy, challenges for sustainable management. International Journal of Wildland Fire 12, 283–297.
| Contemporary fire regimes of northern Australia, 1997–2001: change since Aboriginal occupancy, challenges for sustainable management.Crossref | GoogleScholarGoogle Scholar |
Russell-Smith, J., Murphy, B. P., Meyer, C. P., Cook, G. D., Maier, S., Edwards, A. C., Schatz, J., and Brocklehurst, P. (2009). Improving estimates of savanna burning emissions for greenhouse accounting in northern Australia: limitations, challenges, applications. International Journal of Wildland Fire 18, 1–18.
| Improving estimates of savanna burning emissions for greenhouse accounting in northern Australia: limitations, challenges, applications.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD1MXhvFaqs74%3D&md5=4c16963f5ec10ba4f6593446d2166324CAS |
Sanjari, G., Ghadiri, H., Ciesiolka, C. A. A., and Yu, B. (2008). Comparing the effects of continuous and time-controlled grazing systems on soil characteristics in Southeast Queensland. Australian Journal of Soil Research 46, 348–358.
| Comparing the effects of continuous and time-controlled grazing systems on soil characteristics in Southeast Queensland.Crossref | GoogleScholarGoogle Scholar |
Scanlan, J. C. (2002). Some aspects of tree-grass dynamics in Queensland’s grazing lands. The Rangeland Journal 24, 56–82.
| Some aspects of tree-grass dynamics in Queensland’s grazing lands.Crossref | GoogleScholarGoogle Scholar |
Skjemstad, J. O., Spouncer, L. R., Cowie, B., and Swift, R. S. (2004). Calibration of the Rothamsted organic carbon turnover model (RothC ver. 26.3), using measurable soil organic carbon pools. Australian Journal of Soil Research 42, 79–88.
| Calibration of the Rothamsted organic carbon turnover model (RothC ver. 26.3), using measurable soil organic carbon pools.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD2cXht1ahsbo%3D&md5=4457abe8161deec9d32807f489e68168CAS |
Webb, A. (Ed.) (2002). ‘Pre-clearing soil carbon levels in Australia.’ National Carbon Accounting System Technical Report No. 12. (Australian Greenhouse Office: Canberra, ACT.)
Williams, R. J., Hutley, L. B., Cook, G. D., Russell-Smith, J., Edwards, A., and Chen, X. (2004). Assessing the carbon sequestration potential of mesic savannas in the Northern Territory, Australia: approaches, uncertainties and potential impacts of fire. Functional Plant Biology 31, 415–422.
| Assessing the carbon sequestration potential of mesic savannas in the Northern Territory, Australia: approaches, uncertainties and potential impacts of fire.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD2cXksVKkur0%3D&md5=c2fbf8449de9476603f545f0698b10d1CAS |
Williams, R. J., Zerihun, A., Montagu, K. D., Hoffman, M., Hutley, L. D., and Chen, X. (2005). Allometry for estimating aboveground tree biomass in tropical and subtropical eucalypt woodlands: towards general predictive equations. Australian Journal of Botany 53, 607–619.
| Allometry for estimating aboveground tree biomass in tropical and subtropical eucalypt woodlands: towards general predictive equations.Crossref | GoogleScholarGoogle Scholar |
Williams, R. J., Bradstock, R. A., Barrett, D., Beringer, J., Boer, M. M., Cary, G. J., Cook, G. D., Gill, A. M., Hutley, L. B., Keith, H., Maier, S. W., Meyer, C. P., Price, O., Roxburgh, S. H., and Russell-Smith, J. (2012). Fire regimes and carbon in Australian vegetation. In: ‘Flammable Australia: Fire Regimes, Biodiversity and Ecosystems in a Changing World’. (Eds R. A. Bradstock, A. M. Gill and R. J. Williams.) pp. 273–291. (CSIRO Publishing: Melbourne.)
Witt, G. B., Noël, M. V., Bird, M. I., Beeton, R. J. S., and Menzies, N. W. (2011). Carbon sequestration and biodiversity restoration potential of semi-arid mulga lands of Australia interpreted from long-term grazing exclosures. Agriculture, Ecosystems & Environment 141, 108–118.
| Carbon sequestration and biodiversity restoration potential of semi-arid mulga lands of Australia interpreted from long-term grazing exclosures.Crossref | GoogleScholarGoogle Scholar |
