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Evaluation of three incubation designs for mineralization kinetics of organic materials in soil

Thuriès L., Larré-Larrouy M.C., Pansu M.A.. 2000. Communications in Soil Science and Plant Analysis, 31 (3-4) : p. 289-304.

Carbon (C) mineralization was assessed during incubations of a Mediterranean sandy soil amended with various organic by?products covering a wide range of C and nitrogen (N) contents. The laboratory incubation systems consist in measuring continuously the soil respiration (as CO2?C) in closed chambers, or less current, in pre?storing soil containers in semi?open chambers until transferred and measured for CO2?C evolved in closed 'measuring?jars'. The latest were improved, the new designs permitting to test a much greater number of by?products with a minimum handling. No significant differences were found between the results obtained by the different incubation systems. The storage systems using pre?storage of soils gave reproducible cumulative CO2?C curves. Results obtained with the pre?storage systems could be compared confidently to C mineralization data from studies using permanent closed chambers. One of them was specially reliable and can thus be recommended for long?term incubation experiments. (Résumé d'auteur)

Thématique : Chimie et physique du sol

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