A INFLUÊNCIA DO REGIME DE FOGO NA VARIAÇÃO ESTRUTURAL EM MICROESCALA E O MOSAICO DA VEGETAÇÃO DE CERRADO
DOI:
https://doi.org/10.24278/2178-5031.2010221247Palavras-chave:
Savana, influência do fogo, estrutura da comunidade, mosaico vegetacionalResumo
O fogo é um dos principais condicionantes do mosaico fisionômico da vegetação do Cerrado, em diferentes escalas. O objetivo do presente estudo foi explorar o mosaico estrutural da vegetação do Cerrado em microescala, em áreas com diferentes regimes de fogo, no mosaico formado pelas unidades de conservação Estação Ecológica e Floresta Estadual de Assis, SP. Analisamos a vegetação em quatro transectos com 80 m de extensão, divididos em 20 subamostras de 4 m de comprimento. Para estimar a cobertura de todas as espécies do estrato herbáceo, utilizamos o método de intercepção de linhas em três diferentes faixas de altura: 0-50 cm, 50-100 cm e 100-150 cm. Medimos e identificamos todas as árvores e arbustos presentes nas subparcelas de 4 m x 4 m e coletamos amostras de solo compostas em cada transecto para caracterização ambiental. Comparamos os valores médios de cobertura e densidade da vegetação nos diferentes estratos e efetuamos análises multivariadas para explicar as diferenças florísticas entre as comunidades. Os resultados indicam que o fogo induz aumento na heterogeneidade, especialmente nos estratos inferiores da vegetação. No entanto, não há diferenciação florística que possa ser explicada pelos diferentes regimes de incêndios ou diferenças edáficas.
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Referências
ANDERSON, A.B.; POSEY, D.A. Manejo de cerrado pelos índios Kayapó. , v. 2, p. 77-98, 1985.
_______. Reflorestamento indígena. , v. 6, p. 44-50, 1987.
BALÉE, W. Ka’apor ethnobotany – the historical ecology of plant utilization by an Amazonian people. New York: Columbia University Press, 1994. 396 p.
BOYD, R. Strategies of Indian burning in the Willamette Valley. In: BOYD, R. (Ed.). . Corvallis: Oregon State University Press, 1999. p. 94-138.
BRAITHWAITE, R.W. Biodiversity and fire in the savanna landscape. In: SOLBRIG, O.T.; MEDINA, E.; SILVA, J.F. (Ed.). . Berlin: Springer, 1996. p. 121-140.
BRANDO, P.M.; DURIGAN, G. Changes in cerrado vegetation alter disturbance by frost (São Paulo State, Brazil). , v. 175, p. 205-215. 2004.
BROCKETT, B.H.; BIGGS, H.C.; VAN WILGEN, B.W. A patch mosaic burning system for conservation areas in southern African savannas. , v. 10, p. 169-183, 2001.
CASTRO, E.A.; KAUFFMAN, J.B. Ecosystem structure in the Brazilian Cerrado: a vegetation gradient of aboveground biomass, root mass and consumption by fire. , v. 14, p. 263-283, 1998.
CAVALCANTI, L.H. . 1978. 219 f. Tese (Doutorado) – Universidade de São Paulo, São Paulo.
CLEMENTS, F.E. . Washington, D.C.: Carnegie Institution of Washington, 1916. 512 p.
COUTINHO, L.M. Ecological effects of fire in B razilian Ce r rado. In: HUNTLEY, B.J.; WALKER, B.H. (Ed.). . New York: Springer-Verlag, 1982. p. 273-291. (Ecological Studies, 42).
_______. Fire in the ecology of the Brazilian Cerrado. In: GOLDAMMER, J.G. (Ed.). . Berlin: Springer-Verlag, 1990. p. 82-105.
DALE, M.R.T. . Cambridge: Cambridge University Press, 1999. 326 p.
DEMPEWOLF, J. et al. Burned-area mapping of the Serengeti-Mara region using MODIS reflectance data. , v. 4, p. 312-316, 2007.
DURIGAN, G.; SIQUEIRA, M.F.; FRANCO, G.A.D.C. Threats to the Cerrado remnants of the State of São Paulo, Brazil. , v. 64, p. 366-363, 2007.
EDWARDS, A.C.; RUSSELL-SMITH, J. Ecological thresholds and the status of fire-sensitive vegetation in western Arnhem Land, northern Australia: implications for management. , v. 18, p. 127-146, 2009.
EITEN, G. Vegetação. In: NOVAES-PINTO, M. (Ed.). caracterização, ocupação e perspectivas. 2. ed. Brasília, DF: Editora Universidade de Brasília, 1994. p. 17-73.
FORTIN, M.J.; DALE, M.R.T. a guide for ecologists. Cambridge: Cambridge University Press, 2005. 326 p.
GAUCH, H.G. . Cambridge University Press, 1982. 298 p. (Cambridge Studies in Ecology).
HAYNES, C.D. The pattern and ecology of munwag: traditional aboriginal fire regimes in north-central Arnhemland. , v. 13, p. 203-214, 1985.
HIGGINS, S.I.; BOND, W.J.; TROLLOPE, W.S.W. Fire, resprouting and variability: a recipe for grass tree coexistence in savanna. , v. 88, p. 213-229, 2000.
HILL, M.O.; GAUCH, H.G. Detrended correspondance analysis, an improved ordination technique. Vegatio, v.42.p.47-58, 1980.
HUDAK,A.T.; FAIRBANKS, D.H.K.; BROCKETT, B.H. Trends in fire patterns in a southern African savanna under alternative land use practices. , v. 101, p. 307-325, 2004.
HUSTON, M.A. the coexistence of species in changing landscapes. Cambridge: Cambridge University Press, 1994. 681 p.
ILLIUS, A.; O’CONNOR, D.T.G. On the relevance of non-equilibrium concepts to arid and semi-arid grazing systems. , v. 9, p. 798-813, 1999.
JELTSCH, F. et al. Modelling the impact of small scale heterogenities on tree-grass coexistence in semi-arid savannas. , v. 86, p. 780-793, 1998.
______.; MOLONEY, K.; MILTON, S.J. Detecting process from snapshot pattern: lessons from tree spacing in the southern Kalahari. , v. 85, p. 451-466, 1999.
______.; WEBER, G.E.; GRIMM, D.V. Ecological buffering mechanisms in savannas: a unifying theory of long-term tree-grass coexistence. , v. 161, p. 161-171, 2000.
KAUFFMAN, J.B.; CUMMINGS, D.L.; WARD, D.E. Relationships of fire, biomass and nutrient dynamics along a vegetation gradient in the Brazilian cerrado. , v. 82, p. 519-531, 1994.
KENT, M.; COKER, P. a practical approach. London: Belhaven Press, 1992. 363 p.
LARIS, P. Burning the seasonal mosaic: preventative burning strategies in the wooded savanna of southern Mali. , v. 30, p. 155-186, 2002.
LUDWIG, J.A. et al. Fine-scale vegetation patches decline in size and cover with increasing rainfall in Australian savannas. , v. 14, p. 557-566, 1999a.
LUDWIG, J.A.; TONGWAY, D.J.; MARSDEN, S.G. Stripes, strands or stipples: modelling the influence of three landscape banding patterns on resource capture and productivity in semi-arid woodlands, Australia. , v. 37, p. 257-273, 1999b.
______.; WIENS, J.A.; TONGWAY, D.J. A scaling rule for landscape patches and how it applies to conserving soil resources in savannas. , v. 3, p. 84-97, 2000.
MAX, J. C. M. et al. . São Paulo: Páginas & Letras, 1997. 15 p.
MENTIS, M.T.; BAILEY, A.W. Changing perceptions of fire management in savanna parks. , v. 7, p. 81-84, 1990.
MIRANDA, A.C. et al. Soil and air temperatures during prescribed cerrado fires in Central Brazil. , v. 9, p. 313-320, 1993.
MIRANDA, H.S.; BUSTAMANTE, M.M.C.; MIRANDA, A.C. The fire factor. In: OLIVEIRA, P.S.; MARQUIS, R.J. (Ed.). ecology and natural history of a neotropical savanna New York: Columbia University Press. 2002. p. 51-68.
MISTRY, J. Fire in the cerrado (savannas) of Brazil: an ecological review. , v. 22, p. 425-448, 1998.
______. et al. Indigenous fire management in the cerrado of Brazil: the case of the Krahô of Tocantíns. , v. 33, p. 365-386, 2005.
MYERS, N. et al. Biodiversity hotspots for conservation priorities. , v. 403, p. 853-858, 2000.
PARR, C.L.; BROCKETT, B.H. Patch-mosaic burning: a new paradigm for savanna fire management in protected areas? , v. 42, p. 117-130, 1999.
PERRY, G.L.W. Landscapes, space and equilibrium: shifting viewpoints. , v. 26, p. 339-359, 2002.
PICKETT, S.T.A.; ROGERS, K.H. Patch dynamics: the transformation of landscape structure and function. In: BISONETTE, J.A. (Ed.). effects of pattern and scale. New York: Springer-Verlag, 1997. p. 110-127.
______.; CADENASSO, M.L.; BENNING, T.L. Biotic and abiotic variability as key determinants of savanna heterogeneity at multiple spatiotemporal scales. In: TOIT, J.T. et al. (Ed.). ecology and management of savanna heterogeneity. Washington, D.C.: Island Press, 2003. p. 22-40.
POSEY, D.A. Os Kayapó e a natureza. , v. 2, p. 35-41, 1984.
______. Indigenous management of tropical forest ecosystems: the case of the Kayapó Indians of the Brazilian Amazon. , v. 3, p. 139-158, 1985.
RAMOS, A.E.; ROSA, C.M.M. Impacto das queimadas. In: PINTO, M.N. (Ed.) manejo e conservação dos recursos naturais renováveis. Brasília: Fundação Pró-Natureza, 1992. p. 34-38.
RUSSELL-SMITH, J.; EDWARDS,A.C. Seasonality and fire severity in savanna landscapes of monsoonal northern Australia. , v. 15, p. 541-550, 2006.
STOTT, P. Recent trends in the ecology and management of the world’s savanna formations. , v. 15, p. 18-28, 1991.
SULLIVAN, S.; ROHDE, R. On non-equilibrium in arid and semi-arid grazing systems. , v. 29, p. 1595-1618, 2002.
TONGWAY, D.J.; LUDWIG, J.A. The conservation of water and nutrients within landscapes. In: LUDWIG, J. et al. (Ed.). principles from Australia’s rangelands. Melbourne: CSIRO Publishing, 1997. p. 17-26.
VETTER, S. Rangelands at equilibrium and non equilibrium: recent developments in the debate. , v. 62, p. 321-341, 2005.
VIGILANTE, T.; BOWMAN, D.M.J.S. Effects of individual fire events on the flower production of fruit-bearing tree species, with references to Aboriginal people’s management and use, at Kalumburu, North Kimberley,Australia. Australian Journal of Botany, v. 52, n. 3, p. 405-415, 2004.
WAITE, S. a guide to analysing environmental and ecological field data. Harlow: Pearson-Prentice-Hall, 2000. 391 p. WHELAN, R.J. . Cambridge: Cambridge University Press, 1995. 346 p. (Cambridge Studies in Ecology).
