Plant and Soil

, Volume 163, Issue 2, pp 243–255 | Cite as

Distribution of soil fractions and location of soil bacteria in a vertisol under cultivation and perennial grass

  • M. Kabir
  • J. L. Chotte
  • M. Rahman
  • R. Bally
  • L. Jocteur Monrozier
Research Article


Effects of soil management on soil characteristics were investigated on the rhizosphere (RPP) and the nonrhizosphere (NRPP) soil of a re-grass vertisol underDigitaria 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 ofAzospirillum brasilense and their distribution were determined in soil fractions isolated from the CC, NRPP and RPP soils. Soil macroaggregates (>2000 μm) were similarly predominant in the NRPP and RPP soils when the dispersible clay size fraction (<2 μm) respresented more than 25% of the CC soil mass. The main increase of C content in RPP originated from the macroaggregates (> 2000 μm) 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 ofA. brasilense showed the presence of the active roots ofDigitaria in the macroaggregates and their contact with the dispersible clay size fraction of the rhizosphere soil.

Key words

Azospirillum brasilense Digitaria decumbens microbial biomass C regrass soil rhizosphere soil fractionation vertisol 


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Copyright information

© Kluwer Academic Publishers 1994

Authors and Affiliations

  • M. Kabir
    • 1
  • J. L. Chotte
    • 2
  • M. Rahman
    • 3
  • R. Bally
    • 1
  • L. Jocteur Monrozier
    • 1
  1. 1.Laboratoire d'Ecologie microbienne des sols, CNRS URA 1450Université Lyon 1Villeurbanne CedexFrance
  2. 2.Laboratoire Matière Organique des Sols TropicauxORSTOMFort de France cedex
  3. 3.Laboratory of Soil Microbiology, Department of Soil ScienceUniversity of DahkaDakhaBangladesh

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