2024-10-212024-10-212018ANDRADE, Ádanna de Souza. Dinâmica da paisagem da bacia hidrográfica do rio Marapanim-PA: uma análise temporal da fragmentação florestal. Orientadora: Suezilde da Conceição Amaral Ribeiro. 2018. 65 f. Dissertação (Mestrado em Ciências Ambientais) - Centro de Ciências Naturais e Tecnologia, Universidade do Estado do Pará, Belém, 2018.https://portaldaposgraduacao.uepa.br/handle/riuepa/220AbertoÁreas de preservação permanenteBiodiversidadeFragmentosEfeito de bordaPermanent preservation areasBiodiversityFragmentsEdge effectDissertaçãoCiências Agrárias::Recursos Florestais e Engenharia Florestal::Conservação da Natureza::Conservação de Bacias HidrográficasThe objective of this research was to investigate the landscape dynamics of the Marapanim river watershed, northeastern Pará, by analyzing the transformations of land use and vegetation cover classes, and studying the conflicts of land use in Permanent Preservation Areas (PPA) and the fragmentation of the arboreal vegetation of the watershed. Geoprocessing tools were used to achieve the proposed objectives. The results showed that there was a 44% decrease in dense forest areas in the river watershed, as well as a 21.3% decrease in secondary vegetation. On the other hand, agricultural areas increased by more than 400% from 1988 to 2017. The analysis of the landscape dynamics found that the dense forest class had its stability decreased over the periods, being converted mainly to secondary vegetation. The secondary vegetation class in the period from 2008 to 2017 was mainly converted to agricultural areas, in line with the expansion of this activity in northeastern Pará. Agricultural areas were converted mainly to secondary vegetation, whose function was considered an element of agricultural fallow. The conflict of land use in the PPA was mainly due to the exposed soil class, showing that these areas have been irregularly deforested. Inadequate land use in the PPA had an increase of 46.3% from 1988 to 2017. This calls attention a greater need for supervision and monitoring of these areas. The structure of the landscape in the watershed is very fragmented, with a total of 71,937 fragments with an average size of 2.98 ha, considered of low value for conservation of biodiversity. The arboreal vegetation is the more fragmented class (60.74% of the total fragments), with a shape index of 1.34, indicating a more irregular shape and therefore greater susceptibility to edge effect.PPGCA - Meio ambiente e sustentabilidade