Testing the sensitivity of charcoal as an indicator of fire events in savanna environments: quantitative predictions of fire proximity,area and intensity
Restricted accessResearch articleFirst published online February, 2008
Testing the sensitivity of charcoal as an indicator of fire events in savanna environments: quantitative predictions of fire proximity,area and intensity
The charcoal record contained in lake sedimentary sequences is often used to infer past fire events. Studies to calibrate such charcoal records have been carried out in a range of mid- to high-latitude regions and relationships have been determined between size and quantity of charcoal in the sediment and proximity and spatial extent of the fires. Very little is known, however, about the relationship between fire events in savanna ecosystems and how these are represented in the charcoal record in lake sedimentary sequences. This study presents the results of a project that aimed to calibrate the micro- and macroscopic charcoal record from Kruger National Park, South Africa, with known fire events. Surface sediment samples were analysed for charcoal of different size classes and compared with data on fire proximity, area and intensity (the rate of energy released along a fire front) from fire events over the last 10 years, and the relevant source areas for micro- and macroscopic charcoal were quantified. Results indicated that (i) the Relevant Source Area of Charcoal for lakes c. 200 m diameter is between 0 and 5 km for charcoal particles >50 ∝m in length and between 10 and 15 km for charcoal particles <50 ∝m; (ii) that charcoal deposits are most likely to represent combined fire events from the preceding five years; (iii) that fire proximity, area and intensity are each significantly represented in the charcoal record, but not equally, as the signal resulting from fire intensity is stronger than that for fire proximity or area. Mathematical equations linking charcoal with fire proximity, area and intensity are presented.
Ansley, R.J. and Castellano, M.J.2006: Strategies for savanna restoration in the Southern Great Plains: effects of fire and herbicides . Restoration Ecology14, 420—28.
2.
Behling, H.2007: Late Quaternary vegetation, fire and climate dynamics of Serra do Araçatuba in the Atlantic coastal mountains of Paraná State, southern Brazil . Vegetation History and Archaeobotany16, 77—85.
3.
Bennett, K. and Willis, K.J.2001: Pollen. In Smol, J.P. , Birks, H.J.B. and Last, W.M. , Tracking environmental change using lake sediments, volume 3: terrestrial, algal and siliceous indicators . Kluwer Academic Publishers .
4.
Blackford, J.J.2000: Charcoal fragments in surface samples following a fire and the implications for interpretation of subfossil charcoal data . Palaeogeography Palaeoclimatology Palaeoecology164, 33—42.
5.
Brown, K.J. , Clark, J.S. , Grimm, E.C. , Donovan, J.J. , Mueller, P.G. , Hansen, B.C.S. and Stefanova, I.2005: Fire cycles in North American interior grasslands and their relation to prairie drought . Proceedings- National Academy of Sciences USA102, 8865 .
6.
Byram, G.M.1959: Combustion of forest fuels. In Davis, K.P. , editor, Forest fire: control and use. McGraw-Hill Book Co. , 155—82.
7.
Carcaillet, C.2007: Charred particles analyses. In Elias, S.A. , editor, Encyclopedia of Quaternary science. Elsevier , 1582—93.
8.
Carcaillet, C. , Bouvier, M. , Frechette, B. , Larouche, A.C. and Richard, P.J.H.2001: Comparison of pollen-slide and sieving methods in lacustrine charcoal analyses for local and regional fire history . The Holocene11, 467—76.
9.
Clark, J.S.1988: Particle motion and the theory of charcoal analysis: source area, transport, deposition and sampling . Quaternary Research30, 67—80.
10.
Clark, J.S. and Royall, P.D.1995: Particle-size evidence for source areas of charcoal accumulation in late Holocene sediments of eastern North American lakes . Quaternary Research43, 80 .
11.
Clark, J.S. , Lynch, J. , Stocks, B.J. and Goldammer, J.G.1998: Relationships between charcoal particles in air and sediments in west-central Siberia . The Holocene8, 19—30.
12.
Clark, R.L.1982: Point count estimation of charcoal in pollen preparations and thin sections of sediments . Pollen et Spores24, 523—35.
13.
Cowling, R.M. , Richardson, D.M. and Pierce, S.M.1997: Vegetation of southern Africa. Cambridge University Press .
14.
Earle, C.J. , Brubaker, L.B. and Anderson, P.M.1996: Charcoal in northcentral Alaskan lake sediments: relationships to fire and late-Quaternary vegetation history . Review of Palaeobotany and Palynology92, 83—96.
15.
Eckhardt, H.C. , van Wilgen, B.W. and Biggs, H.C.2000: Trends in woody vegetation cover in the Kruger National Park, South Africa, between 1940 and 1998 . African Journal of Ecology38, 108—15.
16.
Enache, M.D. and Cumming, B.F.2006: Tracking recorded fires using charcoal morphology from the sedimentary sequence of Prosser Lake, British Columbia (Canada) . Quaternary Research65, 282—92.
17.
Finsinger, W. and Tinner, W.2005: Minimum count sums for charcoal-concentration estimates in pollen slides: accuracy and potential errors . The Holocene15, 293—97.
18.
Forbes, M.S. , Raison, R.J. and Skjemstad, J.O.2006: Formation, transformation and transport of black carbon (charcoal) in terrestrial and aquatic ecosystems . Science of the Total Environment370, 190—206.
19.
Froyd, C.A.2006: Holocene fire in the Scottish Highlands: evidence from macroscopic charcoal records . The Holocene16, 235—50.
20.
Gardner, J.J. and Whitlock, C.2001: Charcoal accumulation following a recent fire in the Cascade Range, northwestern USA, and its relevance for fire-history studies . The Holocene11, 541—50.
21.
Gertenbach, W.P.D.1983: Landscapes of the Kruger National Park . Koedoe26, 9—121.
22.
Govender, N. , Trollope, W.S. and Van Wilgen, B.W.2006: The effect of fire season, fire frequency, rainfall and management on fire intensity in savanna vegetation in South Africa . Journal of Applied Ecology43, 748—58.
23.
Higuera, P.E. , Sprugel, D.G. and Brubaker, L.B.2005: Reconstructing fire regimes with charcoal from small-hollow sediments: a calibration with tree-ring records of fire . The Holocene15, 238—51.
24.
Joubert, S.C.J.1986: The Kruger National Park — an introduction . Koedoe29, 1—11.
25.
Kuhlbusch, T.A.J. and Crutzen, P.J.1995: Toward a global estimate of black carbon in residues of vegetation fires representing a sink of atmospheric CO2 and a source of O2 . Global Biogeochemical Cycles9, 491—502.
26.
Laird, L.D. and Campbell, I.D.2000: High resolution palaeofire signals from Christina Lake, Alberta: a comparison of the charcoal signals extracted by two different methods . Palaeogeography Palaeoclimatology Palaeoecology164, 111—23.
27.
Lynch, J.A. , Clark, J.S. and Stocks, B.J.2004: Charcoal production, dispersal, and deposition from the Fort Providence experimental fire: interpreting fire regimes from charcoal records in boreal forests . Canadian Journal of Forest Research34, 1642—56.
28.
MacDonald, G.M. , Larsen, C.P.S. , Szeicz, J.M. and Moser, K.A.1991: The reconstruction of boreal fire history from lake sediments: a comparison of charcoal, pollen, sedimentological and geochemical indices . Quaternary Science Reviews10, 51—71.
29.
Millspaugh, S.H. and Whitlock, C.1995: A 750-year fire history based on lake sediment records in central Yellowstone National Park, USA . The Holocene5, 283—92.
30.
Mworia-Maitima, J.1997: Prehistoric fires and land-cover change in western Kenya: evidences from pollen, charcoal, grass cuticles and grass phytoliths . The Holocene7, 409—18.
31.
Ohlson, M. and Tryterud, E.2000: Interpretation of the charcoal record in forest soils: forest fires and their production and deposition of macroscopic charcoal . The Holocene10, 519—26.
32.
Patterson, W.A. , Edwards, K.J. and Maguire, D.J.1987: Microscopic charcoal as a fossil indicator of fire . Quaternary Science Reviews6, 3—23.
33.
Peters, M.E. and Higuera, P.E.2007: Quantifying the source area of macroscopic charcoal with a particle dispersal model . Quaternary Research67, 304—10.
34.
Pitkanen, A. , Lehtonen, H. and Huttunen, P.1999: Comparison of sedimentary microscopic charcoal particle records in a small lake with dendrochronological data: evidence for the local origin of microscopic charcoal produced by forest fires of low intensity in eastern Finland . The Holocene9, 559—68.
35.
Radke, L.F. , Hegg, D.A. , Hobbs, P.V. , Nance, J.D. , Lyons, J.H. , Laursen, K.K. , Weiss, R.E. , Riggan, P.J. and Ward, D.E.1991: Particulate and trace gas emissions from large biomass fires in North America. In Levine, J.S. , editor, Global biomass burning: atmospheric, climatic, and biospheric implications. MIT Press , 209—24.
36.
Schaefer, V.J.1974: Some physical relationships of fire particulate smoke . Proceedings of the 13th Annual Tall Timbers Fire Ecology Conference.
37.
Scott, A.C. , Cripps, J.A. , Collinson, M.E. and Nichols, G.J.2000: The taphonomy of charcoal following a recent heathland fire and some implications for the interpretation of fossil charcoal deposits . Palaeogeography Palaeoclimatology Palaeoecology164, 1—31.
38.
Scott, L.2002: Microscopic charcoal in sediments: Quaternary fire history of the grassland and savanna regions in South Africa . Journal of Quaternary Science17, 77—86.
39.
Sugita, S.1994: Pollen representation of vegetation in Quaternary sediments: theory and method in patchy vegetation . Journal of Ecology82, 881—97.
40.
Tinner, W. , Hofstetter, S. , Zeugin, F. , Conedera, M. , Wohlgemuth, T. , Zimmermann, L. and Zweifel, R.2006: Long-distance transport of macroscopic charcoal by an intensive crown fire in the Swiss Alps — implications for fire history reconstruction . The Holocene16, 287—92.
41.
Tolonen, K.1986: Charred particle analysis. In Berglund, B.E. , editor, Handbook of Holocene palaeoecology and palaeohydrology. John Wiley and Sons , 485—96.
42.
van Wilgen, B.W. , Everson, C.S. and Trollope, W.S.W.1990: Fire management in southern Africa: some examples of current objectives, practices, and problems. In Goldammer, J.G. , editor, Fire in the tropical biota. Springer-Verlag , 179—215.
43.
van Wilgen, B.W. , Biggs, H.C. , O'Regan, S.P. and Mare, N.2000: A fire history of the savanna ecosystems in the Kruger National Park, South Africa, between 1941 and 1996 . South African Journal of Science96, 167—78.
44.
van Wilgen, B.W. , Trollope, W.S.W. , Biggs, H.C. , Potgieter, A.L.F. and Brockett, B.H.2003: Fire as a driver of ecosystem variability. In Du Toit, J.T. , Rogers, K.H. and Biggs, H.C. , editors, The Kruger experience: ecology and management of savanna heterogeneity . Island Press , 149—70.
45.
van Wilgen, B.W. , Govender, N. , Biggs, H.C. , Ntsala, D. and Funda, X.N.2004: Response of savanna fire regimes to changing fire management policies in a large African National Park . Conservation Biology18, 1533—40.
46.
Venter, F.J. , Scholes, R.J. and Eckhardt, H.C.2003: The abiotic template and its associated vegetation pattern . In Du Toit, J.T. , Rogers, K.H. and Biggs, H.C. , editors, The Kruger experience: ecology and management of savanna heterogeneity. Island Press , 83—129.
47.
Whitlock, C. and Larsen, C.2001: Charcoal as a fire proxy. In Smol, J.P. , Birks, H.J.B. and Last, W.M. , editors, Tracking environmental change using lake sediments, volume 3: terrestrial, algal and siliceus indicators . Kluwer Academic Publishers , 75—97.
48.
Whitlock, C. and Millspaugh, S.H.1996: Testing the assumptions of fire-history studies: an examination of modern charcoal accumulation in Yellowstone National Park, USA . The Holocene6, 7—16.
49.
Whitlock, C. , Skinner, C.N. , Bartlein, P.J. , Minckley, T. and Mohr, J.A.2004: Comparison of charcoal and tree-ring records of recent fires in the eastern Klamath Mountains, California, USA . Canadian Journal of Forest Research34, 2110—21.
50.
Zambatis, N.2001: Rainfall data for the Kruger National Park. Unpublished report. Scientific Services, Kruger National Park, Skukuza, South Africa.
