Determining the distributions of soil carbon and nitrogen in particle size fractions using near-infrared reflectance spectrum of bulk soil samples

Barthès Bernard, Brunet Didier, Hien Edmond, Enjalric Frank, Conche Sofian, Freschet Grégoire T., D'Annunzio Rémi, Toucet-Louri Joële. 2008. Determining the distributions of soil carbon and nitrogen in particle size fractions using near-infrared reflectance spectrum of bulk soil samples. Soil Biology and Biochemistry, 40 (6) : 1533-1537. World Congress of Soil Science. 18, Philadelphie, États-Unis, 9 Juillet 2006/15 Juillet 2006.

https://doi.org/10.1016/j.soilbio.2007.12.023

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Résumé : This study aimed at assessing the potential of near-infrared reflectance spectroscopy (NIRS) for determining the distribution of soil organic matter (SOM) in particle size fractions, which has rarely been attempted. This was done on sandy soils from Burkina Faso (three sites) and Congo-Brazzaville (one site). Over the total sample set, NIRS accurately predicted carbon (C) and nitrogen (N) concentrations (g kg-1 fraction) in the fraction <20 µm. When considering Burkina Faso only, predictions were improved in general; those of C and N amounts (g kg-1 soil) became accurate for the fraction <20 µm but not for the coarser fractions, probably due to heterogeneous SOM repartition. However, most SOM being <20 µm in general, NIRS could be considered promising for determining SOM size distribution.

Mots-clés Agrovoc : matière organique du sol, spectroscopie infrarouge, fraction du sol, azote

Mots-clés géographiques Agrovoc : Congo, Burkina Faso

Classification Agris : P33 - Chimie et physique du sol
U30 - Méthodes de recherche

Champ stratégique Cirad : Hors axes (2005-2013)

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