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Provedor de dados:  IRD
País:  France
Título:  Distribution of soil fractions and location of soil bacteria in a vertisol under cultivation and perennial grass
Autores:  Kabir, M.
Chotte, Jean-Luc
Rahman, M.
Bally, R.
Jocteur Monrozier, L.
Data:  1994
Ano:  1994
Palavras-chave:  BIOLOGIE DU SOL
Resumo:  Effects of soil management on soil characteristics were investigated on the rhizosphere (RPP) and the non-rhizosphere (NRPP) siol of a re-grass vertisol under #Digitaria decumbens$ and in the soil under continuous cultivation (CC). A low energy technique allowed to separate eight size and density fractions, including macro- and micro-aggregates while preserving soil bacteria. Organic C and N, microbial biomass C and the number of total bacteria (AODC) and of #Azospirillum brasilense$ and their distribution were determined in soil fractions isolated from the CC, NRPP and RPP soils. Soil macroaggregates (>2000 micrometers) were similarly predomminant in the NRPP and RPP soils when the dispersible clay size fraction (<2 micrometers) represented more than 25% of the CC soil mass. The main increase of C content in RPP originated from the macroaggregates (>2000 micrometers) and from the root fraction, not from the finer separates. The proportion of organic C as microbial biomass C revealed the low turnover of microbial C in the PP situations, especially in the clay size fraction of the NRPP soil. A common shift of AODC toward the finer separates from planted soils (CC and RPP) revealed the influence of living plants on the distribution of soil bacteria. The relative abundance of #A. brasilense$ showed the presence of the active roots of #Digitaria$ in the macroaggregates and their contact with the dispersible clay size fraction of the rhizosphere soil. (Résumé d'auteur)
Tipo:  Text
Idioma:  Inglês

Kabir M., Chotte Jean-Luc, Rahman M., Bally R., Jocteur Monrozier L. Distribution of soil fractions and location of soil bacteria in a vertisol under cultivation and perennial grass. Plant and Soil, 1994, 163 (2), p. 243-255.
Formato:  text/pdf

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