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Previous issue date: 2009 / Funda????o Jo??o Pinheiro / O Cerrado ?? um complexo vegetacional rico em biodiversidade, com alto grau de endemismo. Contudo, est?? seriamente amea??ado pela expans??o do agroneg??cio e crescentes monoculturas de eucalipto. Pesquisas sobre a regenera????o do Cerrado s??o fundamentais no entendimento da din??mica da vegeta????o e nos estudos de conserva????o. O objetivo desta pesquisa ?? caracterizar a idade da vegeta????o do cerrado sensu-stricto atrav??s da an??lise de uma longa sequ??ncia de imagens TM/Landsat-5 (I984 a 2007), identificando rela????es entre a estrutura da vegeta????o e o comportamento espectral. O Parque Estadual Veredas do Perua??u (PEVP), escolhido como ??rea de estudo, foi ocupado por planta????es de eucalipto at?? 1994 e hoje cont??m extensas ??reas de cerrado sensu-str:icto em processo de regenera????o. O hist??rico de degrada????o do PEVP foi obtido atrav??s da subtra????o de imagens NDVI em pares entre 1984 e 2007. O m??todo de "parcelas" foi adotado para medir as vari??veis estruturais da vegeta????o. Em toda a ??rea amostrada (9.400 m2) foram mensurados e identificados 2.030 indiv??duos lenhosos com CAP maior ou igual a 10 cm, agrupados em 22 fam??lias bot??nicas contendo 45 g??neros e 53 esp??cies. Pol??gonos de 2x2 pixels, representando as 47 parcelas mensuradas no campo foram utilizados para extrair o valor de reflect??ncia das imagens e, assim, caracterizar a resposta espectral da regenera????o da vegeta????o em cada data estudada e analisar as rela????es estat??sticas entre as vari??veis estruturais e espectrais. Apesar dos baixos coeficientes de correla????o observados entre as vari??veis espectrais.e estruturais, um modelo matem??tico multivariado de estimativa da idade da vegeta????o foi gerado a partir de regress??o m??ltipla explicando 61 % da varia????o da idade. A sequ??ncia de 18 imagens Landsat serviu para caracterizar a din??mica do comportamento espectral da regenera????o de cerrado e permitiu estimar o tempo aproximado que a vegeta????o de cerrado dessa regi??o necessita para alcan??ar um aspecto semelhante ao cerrado sem degrada????o recente. Al??m desses resultados, um levantamento fitossociol??gico das parcelas permitiu uma caracteriza????o flor??stica lenhosa dessa regi??o de cerrado comparando os valores obtidos com outras ??reas de condi????o ed??ficas semelhantes. / Cerrado is a biologically rich vegetation complex, with a high degree of endemism. It is, however, seriously threatened by expansion of agribusiness and growing monocultures of eucalyptus. Research on Cerrado regrowth is crucial for understanding the dynamics of vegetation and for studies of conservation. The purpose
of this study is to characterize the age of cerrado sensu-stricto vegetation through the analysis of a long sequence of TM/Landsat-5 images (1984 to 2007), identifying relationships between the structure of vegetation and its spectral behavior. The Veredas do Peruac??u State Park (VPSP), chosen as the study area, was occupied
by eucalyptus plantations until 1994 and now contains large areas of savanna in the process of regeneration. The history of degradation of the VPSP was obtained by subtracting NDVI images in pairs between 1984 and 2007. The ???plot??? methods was adopted to measure the structure of the vegetation. Throughout the area sampled
(9.400m2) 2.030 woody individuals were identified and measured with CAP greater or equal to 10cm grouped in 22 botanical families containing 45 genus and 53 species. Polygons of 2??2 pixels, representing all 47 plots measured in the field, were used to extract reflectance values from the images and thus characterize the spectral
behavior of the regeneration of vegetation over time and analyze the statistical relationship between the spectral and structural variables. Although generally low correlation coefficients were observed between the spectral and structural variables, a valid multivariate mathematical model to estimate the age of cerrado vegetation was generated through multiple regression explaining 61% of the age variation. The sequence of 18 Landsat images
was used to characterize the dinamics of the spectral behavior of regenerating cerrado and estimate the time necessary for cerrado vegetation of that region to regain a spectral aspect similar to non-degraded cerrado. Additionally, a phytosociological survey made it possible to characterize the floristic composition of woody plants and compare these values with other areas having the same edaphic conditions. / Meio ambiente
| Identifer | oai:union.ndltd.org:IBICT/oai:localhost:123456789/164 |
| Date | January 2009 |
| Creators | Costa-Pereira, Priscilla de Souza |
| Contributors | Amaral, Silvana, Timb?? Elmiro, Marcos Ant??nio, Maillard, Philippe, Maillard, Philippe |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da FJP, instname:Fundação João Pinheiro, instacron:FJP |
| Rights | info:eu-repo/semantics/openAccess |
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