Determining the distributions of soil carbon and nitrogen in particle size fractions using near-infrared reflectance spectrum of bulk soil samples |
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| Authors: | Bernard G Barthès Didier Brunet Edmond Hien Frank Enjalric Sofian Conche Grégoire T Freschet Rémi d’Annunzio Joële Toucet-Louri |
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| Institution: | 1. IRD-SeqBio, Montpellier SupAgro, bât. 12, 2 pl. Viala, 34060 Montpellier Cedex 1, France;2. Université de Ouagadougou, UFR SVT, 03 BP 7021 Ouagadougou 03, Burkina Faso;3. UMR System, CIRAD, Département PERSYST, Montpellier SupAgro, bât. 27, 2 pl. Viala, 34060 Montpellier Cedex 1, France;4. UMR LERFOB, INRA, route d’Amance, 54280 Champenoux, France;5. CIRAD, UPR Ecosystèmes de plantations, Campus de Baillarguet, 34398 Montpellier Cedex 5, France;1. CSIRO Entomology, PMB No 2, Glen Osmond, SA 5064, Australia;2. School of Environment and Natural Resources, Ohio State University, Columbus, OH 43210, USA;3. Odum School of Ecology, Ecology Annex, University of Georgia, Athens, GA 30602-2360, USA |
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| Abstract: | 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. |
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