Fire is a key component of many land use systems and a determinant of land change. There is a growing concern that climate change will cause more catastrophic fires, but in many areas the impacts will be mediated by human land use practices. In African savannas, for example, fires are frequent and research finds low inter-annual variability in burned areas in places with highly variable rainfall. This regularity of fire suggests that African regimes are humanized, meaning that they are governed by human practices more than climate variation. Although these fire regimes are stable, they vary greatly over space. This paper will determine the reasons for two distinctly different fire regimes in Mali by integrating land change and savanna fire science. The study takes a two pronged approach to examine the causes of fire regimes and the reasons they change. It tests the notion that land cover (not land use) governs fire regimes by combining long term burn scar and vegetation analysis with local interviews. Results indicate that efforts to link fire and land change science, need to focus more on subtle differences in land cover, landscape pattern and human practices, than on drought, land use or fire policy.
References
[1]
Coughlan, M.R.; Petty, A.M. Linking humans and fire: A proposal for a transdisciplinary fire ecology. Int. J. Wildland Fire 2012, 21, 477–487, doi:10.1071/WF11048.
[2]
Intergovernmental Panel on Climate Change (IPCC). Contribution of Working Groups I, II and III. The Fourth Assessment Report of the Intergovernmental Panel on Climate Change; Cambridge University Press: Cambridge, UK, 2007.
[3]
Pyne, S. Passing the tourch. Am. Sch. J. Manag. 2008, 26, 22–32.
[4]
Flannigan, M.; Krawchuk, M.A.; de Groot, W.J.; Wotton, B.M.; Gowman, L.M. Implications of changing climate for global wildland fire. Int. J. Wildland Fire 2009, 18, 483–507, doi:10.1071/WF08187.
[5]
Williams, J.; Albright, D.; Hoffmann, A.A.; Eritsov, A.; Moore, P.F.; Mendes de Morais, J.C.; Leonard, M.; Miguel-Ayanz, J.S.; Xanthopoulos, G.; van Lierop, P. Findings and Implications from a Coarse-Scale Global Assessment of Recent Selected Mega-Fires; Food and Agriculture Organization: Rome, Italy, 2011.
[6]
Schultz, M.G.; Heil, A.; Hoelzemann, J.J.; Spessa, A.; Thonicke, K.; Goldammer, J.G.; Held, A.C.; Pereira, J.M.C.; van het Bolscher, M. Global wildland fire emissions from 1960 to 2000. Glob. Biogeochem. Cy. 2008, 22, GB2002.
[7]
van der Werf, G.R.; Randerson, J.T.; Giglio, L.; Collatz, G.J.; Kasibhatla, P.S.; Arellano, A.F. Interannual variability in global biomass burning emissions from 1997 to 2004. Atmos. Chem. Phys. 2006, 6, 3423–3441, doi:10.5194/acp-6-3423-2006.
Overpeck, J.; Udall, B. Dry times ahead. Science. 2010, 328, 1642–1643, doi:10.1126/science.1186591.
[10]
Williams, A.P.; Allen, C.D.; Millar, C.I.; Swetnam, T.W.; Michaelsen, J.; Still, C.J. Forest responses to increasing aridity and warmth in the southwestern United States. Proc. Natl. Acad. Sci. USA 2010, 107, 21289–21294.
[11]
Giglio, L.; Randerson, J.T.; van der Werf, G.R.; Kasibhada, P.S.; Collatz, G.j.; Morton, D.C.; de Fries, R.S. Assessing variability and long-term trends in burned area by merging multiple satellite fire products. Biogeosciences 2010, 7, 1171–1186, doi:10.5194/bg-7-1171-2010.
[12]
Grégoire, J.-M.; Eva, H.D.; Belward, A.S.; Palumbo, I.; Simonetti, D.; Brink, A. Effect of land-cover change on Africa’s burnt area. Int. J. Wildland Fire 2013, 22, 107–120, doi:10.1071/WF11142.
[13]
National Aeronautics and Space Administration (NASA). Biomass Burning, 2005. Available online: http://earthobservatory.nasa.gov/Features/BiomassBurning/printall.php (accessed on 13 November 2013).
[14]
Roberts, G.; Wooster, M.J.; Lagoudakis, E. Annual and diurnal African biomass burning temporal dynamics. Biogeosciences 2009, 6, 849–866, doi:10.5194/bg-6-849-2009.
[15]
Koppmann, R.; Von Czapiewski, K.; Reid, J.S. A review of biomass burning emissions, part I: Gaseous emissions of carbon monoxide, methane, volatile organic compounds, and nitrogen containing compounds. Atmos. Chem. Phys. 2005, 5, 10455–10516, doi:10.5194/acpd-5-10455-2005.
[16]
Bond, W.J. What limits trees in C4 grasslands and savannas? Annu. Rev. Ecol. Evol. Syst. 2008, 39, 641–659, doi:10.1146/annurev.ecolsys.39.110707.173411.
[17]
Bond, W.J.; Keeley, J.E. Fire as a global “herbivore”: The ecology and evolution of flammable ecosystems. Trend. Ecol. Evol. 2005, 20, 387–394, doi:10.1016/j.tree.2005.04.025.
[18]
Krawchuk, M.A.; Moritz, M.A. Constraints on global fire activity vary across a resource gradient. Ecology 2011, 92, 121–132, doi:10.1890/09-1843.1.
[19]
Bird, R.B.; Codding, B.F.; Kauhanen, P.G.; Bird, D.W. Aboriginal hunting buffers climate-driven fire-size variability in Australia’s Spinifex grasslands. Proc. Natl. Acad. Sci. USA 2012, 109, 10287–10289.
[20]
Archibald, S.; Scholes, R.J.; Roy, D.P.; Roberts, G.; Boschetti, L. Southern African fire regimes as revealed by remote sensing. Int. J. Wildland Fire 2010, 19, 861–878, doi:10.1071/WF10008.
[21]
Le Page, Y.; Duarte, O.; Jonsson, P.; Pereira, J. Seasonality of vegetation fires as modified by human action: Observing the deviation from eco-climatic fire regimes. Glob. Ecol. Biogeogr. 2010, 19, 575–588.
[22]
Nicholson, S.E.; Grist, J.P. A conceptual model for understanding rainfall variability in the west African Sahel on interannual and interdecadal timescales. Int. J. Clim. 2001, 21, 1733–1757, doi:10.1002/joc.648.
[23]
Laris, P. Humanizing savanna biogeography: Linking human practices with ecological patterns in a frequently burned savanna of southern Mali. Ann. Assoc. Am. Geogr. 2011, 101, 1067–1088, doi:10.1080/00045608.2011.560063.
[24]
Laris, P. Spatiotemporal problems with detecting and mapping mosaic fire regimes with coarse-resolution satellite data in savanna environments. Remote Sens. Environ. 2005, 99, 412–424, doi:10.1016/j.rse.2005.09.012.
[25]
Archibald, S.; Staver, A.; Levin, S. The evolution of human driven fire regimes in Africa. Proc. Natl. Acad. Sci. USA 2012, 109, 847–852, doi:10.1073/pnas.1118648109.
[26]
Moritz, M.A.; Parisien, M.A.; Batllori, E.; Krawchuk, M.A.; Van Dorn, J.; Ganz, D.J.; Hayhoe, K. Climate change and disruption to global fire activity. Ecosphere 2012, 3, 1–22.
[27]
Russell-Smith, J.; Murphy, B.P.; Meyer, C.P.; Cook, G.D.; Maier, S.; Edwards, A.C.; Schatz, J.; Brocklehurst, P. Improving estimates of savanna burning emissions for greenhouse accounting in northern Australia: Limitations challenges, applications. Int. J. Wildland Fire 2009, 18, 1–18, doi:10.1071/WF08009.
[28]
Laris, P. Burning the seasonal mosaic preventive burning strategies in the wooded savanna of southern Mali. Human Ecol. 2002, 30, 155–186, doi:10.1023/A:1015685529180.
[29]
Kull, C.A.; Laris, P. Fire Ecology and Fire Politics in Mali and Madagascar. In Tropical Fire Ecology: Climate Change, Land Use and Ecosystem Dynamics; Cochrane, M., Ed.; Springer-Praxis: Chichester, UK, 2009; pp. 171–226.
[30]
Blaikie, P.; Brookfield, H. Land Degradation and Society; Methuen: London, UK, 1987.
[31]
Pyne, S. Fire in America: A Cultural History of Wildland and Rural Fire; University of Washington Press: Seattle, WA, USA, 1982.
[32]
Kull, C. Isle of Fire; University of Chicago Press: Chicago, IL, USA, 2004.
[33]
Laris, P. Grounding Environmental Narratives: The Impact of a Century of Fighting against Fire in Mali. In African Environment and Development: Rhetoric, Programs, Realities; Moseley, W., Logan, B., Eds.; Ashgate Publishing: London, UK, 2004; pp. 63–85.
[34]
Lewis, H.T. Fire Technology and Resource Management in Aboriginal North America and Australia. In Resource Managers: North American and Australian Hunter-Gatherers; Williams, N.M., Hunn, E.S., Eds.; AAAS Selected Symposium No. 67; Westview: Boulder, CO, USA, 1982; pp. 45–67.
[35]
Laris, P.; Wardell, D.A. Good, bad or “necessary evil?”: Reinterpreting the colonial burning experiments in the savanna landscapes of West Africa. Geogr. J. 2006, 172, 271–290, doi:10.1111/j.1475-4959.2006.00215.x.
[36]
Govender, N.; Trollope, W.; Van Wilgen, B. The effect of fire season, fire frequency, rainfall and management on fire intensity in savanna vegetation in South Africa. J. Appl. Ecol. 2006, 43, 748–758, doi:10.1111/j.1365-2664.2006.01184.x.
[37]
Menaut, J.C.; Lepage, M.; Abbadie, L. Savannas, Woodlands, and Dry Forests in Africa. In Seasonally Dry Tropical Forests; Bullock, S.H., Mooney, H.A., Medina, E., Eds.; Cambridge University Press: Cambridge, UK, 1995; pp. 64–92.
[38]
Henry, C. An integrated Approach to Estimating Groundwater Storage, Variability and Recharge in Southern Mali, Africa. M.Sc. Thesis, Simon Fraser University, Burnaby, Canada, 2011.
[39]
Republic du Mali. La Probl’Ematique des Feux de Brousse: Impact and Strat’Egie de Lutte (The Problem of Bush Fires: The Impact and Strategy of the Fight); Minist`ere de l’Environnement et l’Assainissement, Republique du Mali: Bamako, Mali, 2006.
[40]
de Toit, J.T.; Rogers, K.H.; Biggs, H.C. The Kruger Experience: Ecology and Management of Savanna Heterogeneity; Island Press: Washington, DC, USA, 2003.
[41]
Duvall, C.S. Biocomplexity from the ground up: Vegetation patterns in a West African savanna landscape. Ann. Assoc. Am. Geogr. 2011, 101, 497–522, doi:10.1080/00045608.2011.560061.
[42]
Nasi, R.; Sabatier, M. Projet Inventaire des ressources Ligneuses au Mali; Bamako’ DNEF: Bamako, Mali, 1988.
[43]
Fairhead, J.; Leach, M. Reading forest history backwards: the interaction of policy and local land use in Guinea’s forest savanna mosaic, 1893–1993. Environ. Hist. 1995, 1, 55–91, doi:10.3197/096734095779522708.
[44]
Laris, P.; Bakkoury, A. Nouvelles lecons d’une vieille pratique: Mosaique du feu dans la savane du Mali (New lessons from an old practice: Mosaic burning in the savanna of Mali). Bois For. Trop. 2008, 296, 5–16.
[45]
Laris, P.; Foltz, J.D.; Voorhees, B. Extensification with intensification: The shifting practices of small-holder farmers in the Cotton Belt of Mali. Agric. Syst. 2013. under review.
[46]
Laris, P.; Foltz, J.D. Cotton as Catalyst?: The shifting role of fertilizer in Mali’s Cotton Belt. Human Ecol. 2013. under review.
[47]
Projet Inventaire (PIRT). Carte des Formations Vegetales: Bamako-Ouest (Map of Plant Communities: Bamako-West); Ministere de l’Environement et de l’Elevage: Bamako, Mali, 1990.
[48]
Devineau, J.L.; Fournier, A.; Nignan, S. Savanna fire regimes assessment with MODIS fire data: Their relationship to land cover and plant species distribution in western Burkina Faso (West Africa). J. Arid Environ. 2010, 74, 1092–1101, doi:10.1016/j.jaridenv.2010.03.009.
[49]
Caillault, S. Le feu, la brousse et la savane: Modelisation spatiale de la dynamique des paysages soudaniens (Burkina Faso). Ph.D. Thesis, University de Caen Basse, Normandie, France, 2011.
[50]
Cochrane, M.A.; Barber, C.P. Climate change, human land use and future fires in the Amazon. Glob. Chang. Biol. 2009, 15, 601–612, doi:10.1111/j.1365-2486.2008.01786.x.
[51]
Archibald, S.; Roy, D.; Van Wilgen, B.W.; Scholes, R.J. What limits fire? An examination of the drivers of burnt area in Southern Africa. Glob. Chang. Biol. 2009, 15, 613–630, doi:10.1111/j.1365-2486.2008.01754.x.
