Spatializing soil elemental concentration as measured by X-ray fluorescence analysis using remote sensing data

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Rosin, Nicolas Augusto ; Dematte, Jose A. M. ; de Carvalho, Hudson Wallace Pereira ; Rodriguez-Albarracin, Heidy Soledad ; Rosas, Jorge Tadeu Fim ; Novais, Jean Jesus ; Dalmolin, Ricardo S. D. ; Alves, Marcelo Rodrigo ; Falcioni, Renan ; Tziolas, Nikolaos ; Mallah, Sina ; de Mello, Danilo Cesar ; Francelino, Marcio Rocha

• Tipo de documento: Artigo Científico
• Fonte: CATENA; v. 240, p. 14-pg., 2024-03-23.

Resumo

Spatial soil information has significantly contributed to public policy and planning. The use of X-ray fluorescence spectrometry (XRF) in soil science, primarily in laboratory settings or for isolated point analyses, has been well documented. This study broadens the application of XRF data by integrating it with remote sensing data for a comprehensive understanding of soil patterns and processes. Focusing on a 2574 km 2 area in Brazil, we utilized a lab-based XRF instrument to measure the total concentrations of key chemical elements in the soil, such as Al, Si, Ti, and Fe. These geochemical data were then spatialized using the digital soil mapping (DSM) framework. We employed a synthetic bare soil image and elevation data as covariates in the analysis. The spatial accuracy assessment yielded R 2 values ranging from 0.65 to 0.81 for Fe, 0.62 to 0.78 for Ti, 0.52 to 0.63 for Si, and 0.48 to 0.63 for Al. The digital soil maps of geochemical elements aligned well with existing pedological, and geological maps as evaluated using multiple correspondence analysis. The integration of spatialized XRF data with DSM and remote sensing techniques shows significant promise in assessing soil variations across landscapes based on their chemical composition. (AU)

• Processo FAPESP: 14/22262-0 - Geotecnologias no mapeamento digital pedológico detalhado e biblioteca espectral de solos do Brasil: desenvolvimento e aplicações
• Beneficiário: José Alexandre Melo Demattê
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 21/10063-6 - Mapeamento espaço-temporal 2.5d do estoque de carbono orgânico dos solos do brasil
• Beneficiário: Nícolas Augusto Rosin
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 21/05129-8 - Qualidade dos solos do Brasil via geotecnologias: mapeamento, interpretação e aplicações agrícolas/ambientais: um legado para a sociedade
• Beneficiário: José Alexandre Melo Demattê
• Modalidade de apoio: Auxílio à Pesquisa - Temático