Dinâmica Da Expansão Agrícola Do Município De São Desidério-Ba Entre Os Anos De 1984 a 2008, Importante Produtor Nacional De Soja, Algodão E Milho

Spagnolo, Thiago Felipe Oliveira; Gomes, Roberto Arnaldo Trancoso; Júnior, Osmar Abı́lio de Carvalho; Guimarães, Renato Fontes; Martins, Éder de Souza; Júnior, Antônio Felipe Couto

doi:10.12957/geouerj.2012.4821

Cited by 11 publications

(10 citation statements)

References 5 publications

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“…First, cropland has established itself primarily in the flat, rainy, and highly suitable areas of the extreme western part of the region. It confirms the results of previous studies that have analyzed agricultural expansion in specific municipalities, like São Desidério [35], Barreiras [36], Riachão das Neves [37], and Formosa do Rio Preto [38]. In earlier years, it expanded somewhat linearly, with subsequent expansion in moderately suitable areas.…”

Section: Discussionsupporting

confidence: 89%

Historical Changes in Land Use and Suitability for Future Agriculture Expansion in Western Bahia, Brazil

et al. 2021

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Western Bahia is a critical region in Brazil’s recent expansion of agricultural output. Its outstanding increase in production is associated with strong growth in cropland area and irrigation. Here we present analyses of Western Bahian historical changes in land use, including irrigated area, and suitability for future agricultural expansion that respects permanent protection areas and the limits established by the Brazilian Forest Code in the Cerrado biome. For this purpose, we developed a land use and land cover classification database using a random forest classifier and Landsat images. A spatial multicriteria decision analysis to evaluate land suitability was performed by combining this database with precipitation and slope data. We demonstrate that between 1990 and 2020, the region’s total agricultural area increased by 3.17 Mha and the irrigated area increased by 193,480 ha. Throughout the region, the transition between the different classes of land use and land cover followed different pathways and was strongly influenced by land suitability and also appears to be influenced by Brazil’s new Forest Code of 2012. We conclude that even if conservation restrictions are considered, agricultural area could nearly double in the region, with expansion possible mostly in areas we classify as moderately suitable for agriculture, which are subject to climate hazards when used for rainfed crops but are otherwise fine for pastures and irrigated croplands.

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Section: Discussionsupporting

confidence: 89%

Historical Changes in Land Use and Suitability for Future Agriculture Expansion in Western Bahia, Brazil

et al. 2021

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“…A explotação da água subterrânea para o abastecimento do agronegócio, fortemente atuante na região estudada a partir de meados dos anos 80 (SPAGNOLO et al, 2012), constitui um importante fator na diminuição do volume do escoamento de base, mostrando-se determinante principalmente nas bacias dos rios São Desidério e das Fêmeas.…”

Section: Conclusõesunclassified

Análise hidrológica de séries históricas da Bacia do Rio Grande (BA): contribuição do Sistema Aquífero Urucuia

2016

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Resumo: A análise da variação do escoamento subterrâneo em conjunto com a análise pluviométrica ao longo de uma série histórica permite inferir impactos causados pelas variações climáticas e explotação de água subterrânea em um aquífero. Dada a importância do Sistema Aquífero Urucuia (SAU), que constitui um manancial estratégico na região oeste da Bahia, procedeu-se ao estudo da influência desse aquífero na vazão da bacia hidrográfica do rio Grande, localizada à margem esquerda do rio São Francisco. Para tanto, foram analisadas as séries históricas de vazão e pluviometria no período de 1977 a 2013. Os métodos empregados para separação de escoamentos superficial e subterrâneo em hidrogramas foram Intervalo Fixo, Intervalo Móvel, Mínimos Locais e Médias Móveis. Os resultados obtidos revelam que o fluxo de base corresponde à principal componente da vazão dos rios que cortam o SAU, contribuindo com 81,75% a 93,06% da vazão total. A correlação entre as tendências da pluviometria e do fluxo de base mostra que a diminuição do escoamento subterrâneo tem relação com a queda nas taxas de precipitação. Entretanto, a taxa de diminuição do fluxo de base (0,75% a 3,04% ao ano) é mais acentuada do que a queda da pluviometria (0,07% a 0,88% ao ano), evidenciando assim que outros fatores, como superexplotação do aquí-fero, são responsáveis pela queda do fluxo de base do rio Grande ao longo do tempo. Palavras-chave: Fluxo de base. Separação de hidrogramas. Métodos de filtros digitais.Abstract: The analysis of baseflow variation combined with the precipitation in a time series allows for inferences about the effects of climate change and groundwater exploitation. Considering the importance of Urucuia Aquifer System, which represents a strategic water source in Western Bahia, Northeastern Brazil, we proceeded to study the influence of this aquifer in the flow rate of the Rio Grande basin, located on the left bank of the São Francisco river. We used time series of flow rates and precipitation data from 1977 to 2013 and the methods of hydrographs separation were fixed range, sliding interval, local minimum and smoothed minima. The results demonstrate that the baseflow corresponds to the main component of the rivers flow rate contributing with 81.75% to 93.06%. The correlation between precipitation and baseflow trends shows that the baseflow decreasing is related to the fall of precipitation rates. However, the rate of baseflow decreasing (0.75% a 3.04% per year) is severer than the rate of precipitation (0.07% a 0.88% per year), thus indicating that other factors such as over-exploitation of the aquifer are responsible for the fall of the Rio Grande baseflow over time.

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“…Menke et al (2009) analyzed the evolution of agriculture, using remote sensing data, in the municipality of Luis Eduardo Magalhã es (BA). Spagnolo et al (2012), investigated the dynamics of agricultural expansion in the municipality of Sã o Desidé rio (BA), using satellite images. Formaggio and Sanches (2017) stated that the use of geoprocessing techniques is essential in monitoring agricultural activities, as they guarantee assessments of large areas, in a short time period.…”

Section: Introductionmentioning

confidence: 99%

Space-temporal Dynamics of Agriculture in the Primavera Municipality, Pará State, Brazil: Subsidies for Agroecological Transition

Souza

Santos

Rebello

et al. 2020

JAS

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The exploitation of natural resources to meet human needs for, among other reasons, the advancement of agriculture, livestock, and mining projects, causes changes in environmental systems in time and space. The research objective of this study is to evaluate the space-temporal dynamics of agriculture in the Primavera municipality, located in the Pará Northeast, from 1980 to 2018, and to offer subsidies for the agroecological transition of current agricultural production systems. The methodology is based on the analysis of land use and land cover maps, in three different periods (1984, 2008 and 2018), by using image processing from the LANDSAT (1984 and 2008) and Sentinel (2018) satellites. Agricultural sector characterization was also analyzed, by using secondary data on socioeconomic and productivity variables. The results show that, even after the setup of a large mining enterprise in the Primavera municipality, the agricultural sector did not show major changes in terms of land occupation, increasing from 23.3% (2008) to 29.3% (2018). In addition, when analyzing the agricultural sector, the technology level was found to be at a low level, with little use of chemical inputs and machines. Agricultural diversification was also found to be at a low level, with the cultivation of five crops, predominantly. It is necessary to seek alternatives to improve agricultural production, which can be made viable through the incorporation of sustainable production systems, based on agroecological principles.

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Dinâmica Da Expansão Agrícola Do Município De São Desidério-Ba Entre Os Anos De 1984 a 2008, Importante Produtor Nacional De Soja, Algodão E Milho

Cited by 11 publications

References 5 publications

Historical Changes in Land Use and Suitability for Future Agriculture Expansion in Western Bahia, Brazil

Historical Changes in Land Use and Suitability for Future Agriculture Expansion in Western Bahia, Brazil

Análise hidrológica de séries históricas da Bacia do Rio Grande (BA): contribuição do Sistema Aquífero Urucuia

Space-temporal Dynamics of Agriculture in the Primavera Municipality, Pará State, Brazil: Subsidies for Agroecological Transition

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