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Contribution à l'étude structurale par PY/CG-SM de la matière organique liée aux particules fines (0-50 µm) dans quelques sols sous formations naturelles de longue durée au Burkina Faso

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Author(s): Pallo, FJP. | Lemée, L. | Amblès, A.

Journal: Biotechnologie, Agronomie, Société et Environnement
ISSN 1370-6233

Volume: 15;
Issue: 4;
Start page: 553;
Date: 2011;
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Keywords: Soil | organic matter | physical fractionation | lignins | pyrolysis | Burkina Faso

ABSTRACT
Contribution to the study by PY/GC-MS of organic matter linked to fine particles (0-50 µm) in some soils under long-term natural formations in Burkina Faso. The study aims to enhance the knowledge on organic matter of Arenosols, Ferralsols, and Cambisols in Burkina Faso. It deals with the distribution of C and N in three particles size fractions and is focused on the structures of organic matter linked to the (0-50 µm) fraction. The results showed that total organic matter was lower than 2% in all soil units. More than 70% of total carbon were held by the finest fraction. The main products released by PY/GC-MS technique of the (0-50 µm) fraction were lignin derived compounds, non lignin derived aromatic compounds, carbohydrates derived compounds, fatty acids methyl esters and nitrogen derived compounds. The aliphatic compounds ranged from C12 to C18, C16 being the dominant one. The aliphatic compounds were negatively correlated with the aromatic compounds. A positive correlation was observed between the nitrogen derived compounds and the amounts of clay. On the other hand, the carbohydrates derived compounds were negatively correlated with clay particles. Furthermore, the study pointed out some different structures of lignin such as syringyl, guaiacyl, and p.hydrophenyl. Depending on the nature of wood (hard wood, soft wood and grasses), they reflected the composition of vegetation on the studied sites. Therefore, PY/GC-MS technique was efficient for structural characterization of low amounts of soil organic matter.
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