Soil weathering behavior assessed by combined spectral ranges: Insights into aggregate analysis

Autor(es):Mostrar menos -

Barbosa Guimaraes, Clecia Cristina ^[1] ; Dematte, Jose A. M. ^[1] ; de Azevedo, Antonio Carlos ^[1] ; Diniz Dalmolin, Ricardo Simao ^[2] ; ten Caten, Alexandre ^[3] ; Sayao, Veridiana Maria ^[1] ; da Silva, Rafael Cipriano ^[1] ; Poppiel, Raul Roberto ^[1] ; Mendes, Wanderson de Sousa ^[1] ; Urbina Salazar, Diego Fernando ^[1] ; Barros e Souza, Arnaldo ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Luiz de Queiroz Coll Agr, Soil Sci Dept, Piracicaba, SP - Brazil

^[2] Univ Brasilia, Fac Agron & Vet Med, ICC Sul, Darcy Ribeiro Univ Campus, Asa Norte, BR-70910960 Brasilia, DF - Brazil

^[3] Univ Fed Santa Catarina, Dept Agr Biodivers & Forest, Rod Ulysses Gaboardi, Km 3, POB 101, BR-89520000 Curitibanos, SC - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Geoderma; v. 402, NOV 15 2021.
• Citações Web of Science: 0

Resumo

Most research applying spectral sensors has focused on soil attributes quantification, with strong statistics and hundreds of data. Nevertheless, the explanation of the fundamental relationship between several spectral ranges and specific soil processes remains unclear. Soil sensing can be performed in many spectral ranges, however, the focus is usually on a specific one, which limits the knowledge of the phenomenon. Thus, this work investigated the synergistic performance of several spectral ranges (Gamma-ray; X-ray fluorescence, XRF; visible, Vis; near infrared, NIR; shortwave infrared, SWIR; and mid-infrared, MIR) on the weathering process of soils developed from magmatic material. Two soil profiles from Southeast Brazil (Sao Paulo state) were analyzed, assessing their chemical, physical and mineralogical data. The same profiles were analyzed by the indicated spectral ranges, which were related to mineralogy, weathering indices and mass balance (MB). The elements provided by Gamma-ray were related to the soil mineralogy and weathering degree of horizons. The XRF data enabled the calculation of MB and weathering indices, which were similar to those calculated by the traditional analysis. The spectra of the Vis-NIR-SWIR-MIR region presented alterations in their behavior related to the weathering degree of horizons. This synergic approach separated soil horizons by weathering degree more efficiently than a single spectral region. Single spectral measurements identified several elements and indices, which explained the weathering process. These results support further understanding of large datasets and their validation in statistical modeling. (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