Análise Multitemporal Do Uso E Cobertura Da Terra No Município De Senhor Do Bonfim (Ba), Brasil

Abstract

A compreensão das mudanças do uso e cobertura da terra associada à crescente demanda de recursos naturais consolida relações de causa e efeito em uma ampla escala espaço temporal. Dessa forma, a compreensão e monitoramento do uso e cobertura da terra é fundamental para o entendimento dos padrões de organização do espaço e para o planejamento sustentável dos ambientes e definição de políticas públicas. Nesse sentido, o objetivo deste trabalho é diagnosticar os principais tipos de uso e cobertura da terra no município de Senhor do Bonfim - BA ao longo dos anos de 1986, 1996, 2009 e 2017. Para este diagnóstico utilizou-se como base as imagens orbitais do Satélite LANDSAT, integradas e processadas em ambiente de Sistema de Informação Geográfica, por meio da classificação supervisionada híbrida. Os resultados obtidos atestam a predominância da Caatinga Arbustiva e comprovam o gradativo crescimento dos cultivos agrícolas, das áreas urbanas e das florestas em encostas. Ao final, o trabalho realizado pretende colaborar aos estudos de evolução da paisagem e auxiliar melhores propostas de planejamento do uso e cobertura de municípios situados em regiões semiáridas tropicais.

Direct seeding as a recruitment alternative for the threatened tropical palm Syagrus coronata (Mart.) Beccari in Brazilian dry forest

“…This study was carried out at the Jiboia Settlement (1,045.44 ha), in the rural area of the municipality of Senhor do Bonfim, Center-North of the State of Bahia (10°32'54.7" S-40°11'12.9" W) (IBGE, 2017). The original vegetation of this area is the tropical dry forest, mainly characterized by the presence of xerophytes and semi deciduous trees (Silva and Barbosa, 2017;Souza and Reis, 2020). The total annual precipitation varies from 750 to 800 mm, the dry season occurs between July and October with an average precipitation of 205 mm and an average precipitation of 392 mm in the summer rainy season, which occurs from December to April.…”

“…The total annual precipitation varies from 750 to 800 mm, the dry season occurs between July and October with an average precipitation of 205 mm and an average precipitation of 392 mm in the summer rainy season, which occurs from December to April. The annual temperature varies between 25° and 29°C (Souza and Reis, 2020;Pereira et al, 2021).…”

“…Tropical ecosystems have undergone intense deforestation due to human activities (Silva and Barbosa, 2017;Espírito-Santo et al, 2020;Souza and Reis, 2020). Changes in land cover and use lead to a decrease in biodiversity, compromising ecological regulatory services such as pollination, seed dispersal and biological control (Silva et al, 2020).…”

“…Changes in land cover and use lead to a decrease in biodiversity, compromising ecological regulatory services such as pollination, seed dispersal and biological control (Silva et al, 2020). Environments with little forest cover, such as pastures, are characterized by a lack of vegetative propagules (Guarino and Scariot, 2014;Souza-Silva et al, 2015), high predation of seeds and seedlings by livestock (Hordijk et al, 2019), and high soil degradation (Souza and Reis, 2020). Additionally, competition with exotic grasses act as inhibitors of natural regeneration, restricting the restoration of native plants (Souza-Silva et al, 2015;Pereira et al, 2021).…”

“…The Brazilian Caatinga is the largest remnant of tropical dry forest in South America, which has more than 60% of its area occupied by anthropogenic ecosystems and demand urgent ecological restoration actions (Silva and Barbosa, 2017;. The loss of area in this ecosystem is mostly due to the removal of vegetation for the croplands (Souza and Reis, 2020), opening of pastures for livestock (Raupp et al, 2020), hunting and logging, causing intensive and extensive disturbances . This entire process leaves a legacy that in some cases can delay the natural regeneration of the ecosystem (Palma and Laurance, 2015;Espírito-Santo et al, 2020).…”