Landscape dynamics of the Marapanim River watershed, Pará, Brazil
DOI:
https://doi.org/10.6008/CBPC2179-6858.2020.004.0032Keywords:
Change detection, Natural resources, Land useAbstract
The northeastern mesoregion of Paraense stands out for the substitution of native and/or secondary forests for agricultural activities, with emphasis on the performance of family agriculture and the use of rudimentary agricultural techniques, such as the process of knocking and burning. The objective of the present study was to analyze the landscape dynamics of the Marapanim river watershed, northeast of Pará, based on the transitions and persistence of vegetation cover and land use classes. To this end, Landsat satellite 5 and 8 images of the years 1988, 1998, 2008 and 2017 were retrieved and analyzed through maximum likelihood classification. Subsequently, a Change Detection analysis was performed between the classes throughout the period studied. The results showed that there was a decrease of almost 44% of dense vegetation areas and 21.3% of secondary vegetation areas. Agricultural and livestock areas increased by 412.5% from the first to the last year analyzed. The dynamics of the landscape showed that dense vegetation was converted mainly into secondary vegetation, while the classes of exposed soil and secondary vegetation were converted primarily into agriculture and cattle raising areas in the last period of analysis.
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