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

• Document type: Journal article
• Source: CATENA; v. 240, p. 14-pg., 2024-03-23.

Abstract

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)

• FAPESP's process: 14/22262-0 - Geotechnologies on a detailed digital soil mapping and the Brazilian soil spectral library: development and applications
• Grantee: José Alexandre Melo Demattê
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 21/10063-6 - 2.5D SPATIO-TEMPORAL MAPPING OF SOIL ORGANIC CARBON STOCK IN BRAZIL
• Grantee: Nícolas Augusto Rosin
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 21/05129-8 - The Brazilian soil quality determined by geotechnologies: mapping, interpretation and agricultural/environmental applications: a legacy for society
• Grantee: José Alexandre Melo Demattê
• Support Opportunities: Research Projects - Thematic Grants