Essai de correlation entre proprietes biochimiques d'un sol salsodique et sa biomasse |
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Authors: | N Mallouhi F Jacquin |
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Institution: | Institut National Polytechnique de Lorraine, Ecole Nationale Supérieure d''Agronomie et des Industries Alimentaires, Service Science du Sol, 38, rue Ste Catherine, 54000 Nancy, France |
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Abstract: | In order to study the influence of salinity on the biological activity of soils, experiments were performed in a saline alkaline soil from Tunisia (mediterranean semi-arid climate) and compared with results of similar experiments performed in a pelosol from a semi-continental climate (Lorraine, France). Both soils had received 14C-labelled maize straw.The microbial biomass was estimated by a modified Jenkinson's method and also by measurements of ATP content. The microbial activity was determined by measurements of total and 14CO2 evolved.The results have shown an inverse correlation between the salinity determined by electrical conductivity and the biomass estimations and its activity. The higher ATP con tent (141.5 ng · 100 g?1 soil) was observed in the pelosol and the lower (99.4 ng · 100 g?1) in the saline soil. Simultaneously and respectively in the pelosol and the saline soil the biological carbon evolved was 114 and 54 mgC 100 g?1 soil and the average rate of 14C mineralization was 0.82 and 0.45 mgC · 100 g?1 soil.Results have also shown that CO2 evolved after sterilization and reinoculation is not only provided by mineralization of microbial biomass during fumigation but also from interaction between organic-matter and CHCl3; this interaction is more intense in the saline soil. |
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