Data/hora: 22/06/2024 13:42:29

Biblioteca(s): 	Embrapa Cerrados.	
Data corrente: 	06/03/2014	
Data da última atualização: 	10/03/2014	
Autoria: 	OLIVEIRA, J. F.; BROSSARD, M.; VENDRAME, P. R. S.; MAYI III, S.; CORAZZA, E. J.; MARCHAO, R. L.; GUIMARÃES, M. de F.	
Afiliação: 	JOSÉ FRANCIRLEI OLIVEIRA, UEL; MICHEL BROSSARD, INSTITUT DE RECHERCHE POUR LE DÉVELOPPMENT, MONTPELLIER, FRANCE; PEDRO RODOLFO SIQUEIRA VENDRAME, UEL; STANISLAS MAYI III, UEL; EDEMAR JOAQUIM CORAZZA, SCT; ROBELIO LEANDRO MARCHAO, CPAC; MARIA DE FÁTIMA GUIMARÃES, UEL.	
Título: 	Soil discrimination using diffuse reflectance Vis-NIR spectroscopy in a local toposequence.	
Ano de publicação: 	2013	
Fonte/Imprenta: 	Comptes Rendus Geoscience, v. 345, p. 446?453, 2013.	
DOI: 	http://dx.doi.org/10.1016/j.crte.2013.12.001	
Idioma: 	Inglês	
Conteúdo: 	Vis?NIR spectroscopy is nowadays presented as a possible routine method for soil sample analysis. However, there is still no consensus on which is the best multivariate statistical method to use. We propose to use principal component analysis to complete the spectral data treatment. The soil samples came from a pedological cover made up of red?yellow Latosols: 88 samples of 11 soil profiles on four toposequences were collected; clay, organic matter, silica, iron, aluminum and titanium total contents were determined; the contents of goethite, hematite, gibbsite, and kaolinite were calculated. Diffuse reflectance Vis?NIR spectroscopy at wavelengths from 400 to 2400 nm combined with principal component analysis (PCA) was sufficiently sensitive to discriminate different Latosols. Wavelengths of 700 nm and 2200 to 2300 nm were influenced by content ratios of organic matter and iron oxides (700 nm), and kaolinite and gibbsite absorption (2200 and 2300 nm). The spectral responses were affected not only by the content of these constituents, but also by the composition of the minerals, so that the same class of Latosol may have different or similar spectral responses. The role of microaggregation is discussed.	
Palavras-Chave: 	PCA.	
Thesagro: 	Ferralsolo; Latossolo; Matéria orgânica; Mineralogia.	
Thesaurus Nal: 	Mineralogy; Organic matter.	
Categoria do assunto: 	P Recursos Naturais, Ciências Ambientais e da Terra	
Registro original: 	Embrapa Cerrados (CPAC)	
Exemplares: 	CPAC - (33919-1) - UPC - AP - PP - S1738 -  - S1738 - DIS