Modelagem da distribuição potencial do palmiteiro (euterpe edulis Martius)em região montanhosa a partir de variáveis topográficas / Palm tree (Euterpe Edulis Martius)potential distribution modeling in a mountainous region based on topographic variables

AUTOR(ES)
DATA DE PUBLICAÇÃO

2000

RESUMO

The objective of this work is to produce a potential distribution model for the palm tree Euterpe edulis Martius. Two suppositions were considered: (1)the distribution of E. edulis is conditioned by a set of environmental variables; (2)given that the previous condition is true, it is possible to establish a predictive spatial model of these relationships in order to map the potential distribution of the species. The first supposition was investigated with the use of published information on the ecological behavior of the species in relation to the variables under consideration. Further information was collected during exploratory field works that were conducted in the Serra da Mantiqueira between the municipalities of Taubaté - SP and Campos do Jordão - SP. The following environmental variables were considered: land cover (forest/nonforest)and the topographic variables (altitude, slope curvature, slope attitude and distance from the drainage network). In the investigation of the second supposition, Remote Sensing and Geographic Information System techniques were applied for the representation of the landscape and for the modeling of the environmental variables into values of favorability for E. edulis ranked into the interval [0,1]. In the modeling of terrain favorability to E edulis, first order functions were established according to the assumptions in order to map the conceptual model into an ordinal model of favorability through the use of Map Algebra. The global favorability weight for each topographic variable was attained with the use of decision support technique Analytic Hierarchical Process (AHP). With these weights, Map Algebra was again utilized to construct the Potential Distribution Gradient (PDG)for the E. edulis, which does not consider the land cover, and to produce the Current Potential Distribution Gradient (CPDG)which is the PDG restricted to forested areas. The presented study can be used as a support to other studies oriented to the improvement of the techniques used here or to the ones that aim at the acquisition of quantitative information about plant distribution. The methods and the results can be applied to the implementation and management of environmental protection areas for E. edulis, to the detection of areas favorable to E. edulis subject to anthropic pressure and also, to the support of sylvicultural projects for the restoration and management of the species.

ASSUNTO(S)

forest trees terrain analysis (dtm) palmeira geographic information systems (gis) forests análise de terreno (mnt) habitats distribuição geográfica sistemas de suporte a decisão decision support systems serra da mantiqueira (sp) árvores (plantas) processo analítico hierárquico tropical pluvial forest sistemas de informação geográfica (gis) floresta tropical pluvial trees (plants) plants (botany) florestas geographic distribution habitats analytic hierarchical process (ahp) vegetaÇÃo taubaté (sp) campos do jordão (sp)

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