Remote sensing techniques via Google Earth Engine for land degradation assessment in the Brazilian semiarid region, Brazil. (December 2022)

• Record Type: Journal Article
• Authors: Silva, Marcos Vinícius da; Pandorfi, Héliton; Oliveira-Júnior, José Francisco de; Silva, Jhon Lennon Bezerra da; Almeida, Gledson Luiz Pontes de; Montenegro, Abelardo Antônio de Assunção; Mesquita, Marcio; Ferreira, Maria Beatriz; Santana, Taize Calvacante; Marinho, Gabriel Thales Barboza; Costa, Adriana Rodolfo da; Giongo, Pedro Rogério
• Is Part Of: Journal of South American earth sciences. Volume 120(2022)
• Publication Date: 2022-12
• Subjects: Vegetation cover -- Surface water bodies -- Land use and land cover -- Caatinga biome -- Environmental restoration; Geology -- Latin America -- Periodicals; Earth sciences -- Latin America -- Periodicals; Geology -- Antarctica -- Periodicals; Earth sciences -- Antarctica -- Periodicals; Geology -- Caribbean Area -- Periodicals; Earth sciences -- Caribbean Area -- Periodicals; Géologie -- Amérique latine -- Périodiques; Sciences de la terre -- Amérique latine -- Périodiques; Géologie -- Antarctique -- Périodiques; Sciences de la terre -- Antarctique -- Périodiques; Géologie -- Caraïbes (Région) -- Périodiques; Sciences de la terre -- Caraïbes (Région) -- Périodiques; Earth sciences; Geology; Antarctica; Caribbean Area; Latin America; Periodicals; 550.5
• DOI: 10.1016/j.jsames.2022.104061
• Languages: English
• ISSNs: 0895-9811

Abstract

Abstract: Land degradation is a major challenge worldwide, limiting socio economical development and jeopardizing biodiversity, being associated to changes in land use and to climate variability. FAO shows that the world's soils have environmental degradation in large scale, particularly in semiarid areas, reducing environmental services, and impacting agriculture and livestock. Therefore, the objective was to evaluate the spatio-temporal dynamics of vegetation cover and land degradation in the microregion of Vale do Ipojuca in the Pernambuco State (Caatinga biome), in the Brazilian semiarid region, through vegetation indices. Land use and land cover maps (LULC), Normalized Difference Vegetation Index (NDVI), Leaf Area Index (LAI), and Normalized Difference Water Index (NDWI) were determined based on the annual average between the years 2014–2021. The water bodies showed remarkable reductions between 2014 and 2016, when the values were 1226, 789, and 558 ha, respectively. As observed in the NDVI, from the year 2017 onwards, the LAI values were resilient. The determination of vegetation indices associated with LULC maps and data, allowed us to accurately validate the responses of the indices studied in the semiarid region. The approach highlights the strong resilience of the Caatinga Biome. A robust methodology is presented in this study, being compatible for existing arid regions in the world. Highlights: The phenomenon of great droughts in the northeast occurs until 2019. Soil degradation processes are evident via vegetation indices and LULC maps. The degradation of water bodies is high in the region of this study. The validation of TerraClimate products for the NEB is satisfactory.