Integrating geospatial and multi-depth laboratory spectral data for mapping soil classes in a geologically complex area in southeastern Brazil

Autor(es)

Vasques, G. M. ^[1] ; Dematte, J. A. M. ^[2] ; Rossel, R. A. Viscarra ^[3] ; Lopez, L. Ramirez ^[4] ; Terra, F. S. ^[5] ; Rizzo, R. ^[6] ; De Souza Filho, C. R. ^[7]

Afiliação do(s) autor(es)

^[1] Embrapa Soils, BR-22460000 Rio De Janeiro - Brazil

^[2] Univ Sao Paulo, Luiz de Queiroz Coll Agr, Dept Soil Sci, BR-13418900 Piracicaba - Brazil

^[3] CSIRO Land & Water, Bruce E Butler Lab, Canberra, ACT 2601 - Australia

^[4] Swiss Fed Inst Technol, Inst Terr Ecosyst, CH-8092 Zurich - Switzerland

^[5] Fed Univ Valleys Jequitinhonha & Mucuri, Inst Agr Sci, BR-38610000 Unai - Brazil

^[6] Univ Sao Paulo, Ctr Nucl Energy Agr, Environm Anal & Geoproc Lab, BR-13416000 Piracicaba - Brazil

^[7] Univ Estadual Campinas, Inst Geosci, Geol & Nat Resources Dept, BR-13083970 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: European Journal of Soil Science; v. 66, n. 4, p. 767-779, JUL 2015.
• Citações Web of Science: 10

Resumo

Soil mapping across large areas can be enhanced by integrating different methods and data sources. This study merges laboratory, field and remote sensing data to create digital maps of soil suborders based on the Brazilian Soil Classification System, with and without additional textural classification, in an area of 13000ha in the state of SAo Paulo, southeastern Brazil. Data from 289 visited soil profiles were used in multinomial logistic regression to predict soil suborders from geospatial data (geology, topography, emissivity and vegetation index) and visible-near infrared (400-2500nm) reflectance of soil samples collected at three depths (0-20, 40-60 and 80-100cm). The derived maps were validated with 47 external observations, and compared with two conventional soil maps at scales of 1:100000 and 1:20000. Soil suborders with and without textural classification were predicted correctly for 44 and 52% of the soil profiles, respectively. The derived suborder maps agreed with the 1:100000 and 1:20000 conventional maps in 20 and 23% (with textural classification) and 41 and 46% (without textural classification) of the area, respectively. Soils that were well defined along relief gradients (Latosols and Argisols) were predicted with up to 91% agreement, whereas soils in complex areas (Cambisols and Neosols) were poorly predicted. Adding textural classification to suborders considerably degraded classification accuracy; thus modelling at the suborder level alone is recommended. Stream density and laboratory soil reflectance improved all classification models, showing their potential to aid digital soil mapping in complex tropical environments. (AU)

• Processo FAPESP: 09/10711-6 - Estratégias tecnológicas em mapeamento de solos: uma nova metodologia aplicada
• Beneficiário: José Alexandre Melo Demattê
• Linha de fomento: Bolsas no Exterior - Pesquisa