Farmers Establishment Impact on the Forest Dynamic of Monogaga Protected Forest, in the Southwest of Côte d’Ivoire: Remote Sensing and Geographical Information Systems (GIS) Approach

The deforestation is a major problem in Côte d’Ivoire. Monogaga protected forest is strongly cleared for agriculture. Thus, the research aims to determine the influence of the farmer’s occupancies on the forest dynamic. The supervised classification by Neural net has been applied with success to Landsat imagery of 1986 and 2017. It has been preceded by the vegetation physiognomic characterization. The vegetation units are the closed forest, the degraded forest and the fallow-crops. The neural Net classification has been used to discriminate the closed forest area. To the dynamic level, the loss of closed forest proportion between 1986 and 2017 is 86.52%. The annual deforestation rate in regular (linear) and irregular (exponential) level is respectively 2.88% and 6.46% on 30 years. The anthropogenic units descended of the degradation represent some more 90 % of land cover, with a contribution of the crops at more than 40%. These same units are also implied in regeneration to a proportion of some more 90%, always with the crops proportion of 60%. Several mutations are in use. It’s the degradation, conservation and regeneration, with a predominance of degradation. The result shows the bad conservation. This survey showed that the protected forest is submitted to agricultural pressure and all other anthropogenic activities. It is important to have a forest conservation politics and more efficient management.

ALTERAÇÕES FLORÍSTICAS EM UMA FLORESTA ESTACIONAL SEMIDECIDUAL NO MUNICÍPIO DE VIÇOSA, MG, ENTRE 1994 E 2008

Este estudo teve como objetivo avaliar mudanças na composição florística de uma Floresta Estacional Semidecidual, através do monitoramento de 10 parcelas permanentes instaladas na Mata da Silvicultura, Viçosa, Minas Gerais. Foram identificados e medidos todos os indivíduos com DAP ≥5 cm, nos anos de 1994, 1997, 2000, 2004 e 2008. Os resultados encontrados mostraram que a área em estudo encontra-se em estágio médio de sucessão, apresentando dominância de espécies secundárias iniciais e tardias. Verificou-se, também, que em função do avanço sucessional da floresta, ocorreram mudanças na composição florística da área ao longo do período monitorado.Palavras-chave: Dinâmica florestal; diversidade; sucessão florestal. AbstractFloristic changes in a tropical semideciduous forest in Viçosa, MG, between 1994 and 2008. This research aimed to evaluate changes in floristic composition of a tropical semideciduous forest, by monitoring 10 permanent plots established in the “Mata da Silvicultura”, Viçosa, Minas Gerais. All individuals with DBH ≥ 5 cm were identified and measured in the years 1994, 1997, 2000, 2004 and 2008. The results revealed that the focused area lies in the intermediate stage of succession, presenting dominance of early and late secondary species. It was also verified that, depending on the progress of the forest succession, changes have occurred in the composition of flora in the area by the monitored period.Keywords: Forest dynamic; diversity; forest succession.