Multitemporal Analysis of Land Use and Land Cover in the Amazon: The Expansion of Large-scale Agriculture in the Curuá-Una River Basin
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Abstract
The soy expansion has generated important changes in the Brazilian Amazon due to land concentration processes, landscape homogenization and expansion over other forms of production. In Pará, this process has occurred more intensely in the municipalities of Santarém, Belterra and Mojuí dos Campos, which are part of the Curuá-Una river basin. This study aims to analyze the dynamics of land use and land cover for the period 2000 to 2019, in the Curuá-Una River basin, observing which classes Large-Scale Agriculture (AGLE) has expanded. The current land use and land cover databases in the Amazon do not include Small-Scale Agriculture (AGPE) class. To include this class in the mapping we used TM/OLI/Landsat images with multi-resolution segmentation techniques and object-oriented classification. For the analysis of the AGLE dynamics, transition matrices for the periods of 2000-2010, 2010-2019 and 2000-2019 were built. As a result, we observed an area gain for AGLE in the period 2000-2019, from 23 km² to 1,093 km². The period of 2000-2010 was the one with the greatest gain (25%). AGLE's expansion took place primarily over pasture (38%), secondary vegetation (31%), forest (27%) and AGPE (2%). About 25% of the AGPE area in 2000 were converted to AGPE in 2019. That proportion may be even higher, as part of the secondary vegetation converted to AGLE, is part of the AGPE fallow system. The results reinforce the importance of establishing public policies valuing and strengthening the local economy.
and object-oriented classification. For the analysis of the AGLE dynamics, transition matrices for the periods of
2000-2010, 2010-2019 and 2000-2019 were built. As a result, we observed an area gain for AGLE in the period
2000-2019, from 23 km² to 1,093 km². The period of 2000-2010 was the one with the greatest gain (25%). AGLE's
expansion took place primarily over pasture (38%), secondary vegetation (31%), forest (27%) and AGPE (2%).
About 25% of the AGPE area in 2000 were converted to AGPE in 2019. That proportion may be even higher, as
part of the secondary vegetation converted to AGLE, is part of the AGPE fallow system. The results reinforce the
importance of establishing public policies valuing and strengthening the local economy.
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