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1. Determining soil properties in Amazonian Dark Earths by reflectance spectroscopy

Author:
Araújo, Suzana Romeiro; Söderström, Mats; Eriksson, Jan; Isendahl, Christian; Stenborg, Per; Demattê, JoséA.M.
Source:
Geoderma 2015 v.237-238 pp. 308-317
ISSN:
0016-7061
Subject:
plateaus; anthropogenic soil types; soil organic carbon; cation exchange capacity; soil map; calcium; exchangeable calcium; models; least squares; reflectance spectroscopy; soil analysis; pH; nutrients; prediction; phosphorus; Amazonia; Brazil
Abstract:
... In the Brazilian Amazon patches of anthropogenic soils known as Amazonian Dark Earths (ADEs) occur. These soils are rich in carbon (C) and plant nutrients compared to the naturally occurring strongly weathered soils. In this paper we explore the potential of visible to near infrared (vis–NIR) and mid infrared (MIR) spectroscopy as an alternative to traditional soil analysis of ADE properties for p ...
DOI:
10.1016/j.geoderma.2014.09.014

2. Spectral libraries for quantitative analyses of tropical Brazilian soils: Comparing vis–NIR and mid-IR reflectance data

Author:
Terra, Fabrício S.; Demattê, José A.M.; Viscarra Rossel, Raphael A.
Source:
Geoderma 2015 v.255-256 pp. 81-93
ISSN:
0016-7061
Subject:
Fourier transform infrared spectroscopy; acidity; adsorption; aluminum; boron; calcium; clay; copper; data collection; ferric oxide; iron; magnesium; manganese; models; organic matter; pH; particle size; phosphorus; potassium; prediction; quantitative analysis; reflectance; reflectance spectroscopy; sand; silicon; soil mineralogy; soil properties; sulfuric acid; support vector machines; surveys; temperate soils; titanium dioxide; tropical soils; wet digestion method; Brazil
Abstract:
... Reflectance spectroscopy has great potential to monitor and evaluate soils at large scale; however, its effectiveness in predicting properties from tropical soils still needs to be tested since their mineralogy, organic matter levels, and charge and ion adsorption dynamics are different from temperate soils. Also, it is important to assess the most appropriate spectral range for quantification of ...
DOI:
10.1016/j.geoderma.2015.04.017