@article{fdi:010012725,
  title = {{S}ites of microbial assimilation and turnover of soluble and particulate {C}-labelled substrates decomposing in a clay soil},
  author = {{C}hotte, {J}ean-{L}uc and {L}add, {J}.{N}. and {A}mato, {M}.},
  editor = {},
  language = {{ENG}},
  abstract = {{D}ifferent types of 14{C}-labelled substrates, two soluble (glucose and starch) and two particulate (legume and wheat leaves), were incubated in a {V}ertisol to test the importance of substrate-soil matrix relationships in the processes of soil organic matter decomposition and the location of microorganisms. {M}ineralized {C} ({CO}2 12{C}, {CO}2 14{C}) were measured within 66 d of incubation. {S}ieving and sedimentation procedures were used to fractionate ({L}ight fractions ({L}f) > 250 micrometers, {L}f 50-250 micrometers, {H}eavy fractions ({H}f) > 50 micrometers, {H}f 2-50 micrometers, and {H}f 0-2 micrometers) the soil. {B}iomass {C} (12{C} and 14{C}) in unfrationated soil and in fractions was assayed after 3, 38 and 66 d. {C}omparisons with an unamended soil (control) were made. {D}ecay rates of substrate 14{C} were highest during the first 3 d of incubation. {A}fter 66 d, substrate-derived {CO}2 14{C} represented 63, 64, 59 and 51%, of input 14{C} in soils amended with the glucose, starch, legume and wheat, respectively. {U}nlike 14{C}, rates of mineralization of 12{C} in amended and unamended soils remained more uniform throughout. {T}otal biomass {C} in soluble substrate-amended soils was similar to that in the control, despite about 60% of total biomass {C} being derived from 14{C} substrate amendments. {B}y contrast, decomposition of particulate substrates increased total biomass {C} concentration at day 3. {T}here was little or no turnover of 14{C} apparent within the first 3 d, as indicated by high (0.60) growth efficiencies (biomass 14{C}/[biomass 14{C} + {CO}2 14{C}]). {F}raction weights were constant. {I}rrespective of treatments, the silt-size fraction ({H}f 2-50 micrometers) was the most abundant (about 51% of total soil weight). {T}his fraction concentrated 65% of the clay fraction as microaggregates. {T}he fraction ({H}f > 50 micrometers) approximated sand particles (> 50 micrometers)... ({D}'apr{\`e}s r{\'e}sum{\'e} d'auteur)},
  keywords = {{MICROBIOLOGIE} {DU} {SOL} ; {VERTISOL} ; {MATIERE} {ORGANIQUE} ; {DECOMPOSITION} ; {BIOMASSE} ; {CARBONE} ; {MINERALISATION} ; {ETUDE} {EXPERIMENTALE}},
  booktitle = {},
  journal = {{S}oil {B}iology and {B}iochemistry},
  volume = {30},
  numero = {2},
  pages = {205--218},
  ISSN = {0038-0717},
  year = {1998},
  DOI = {10.1016/{S}0038-0717(97)00115-6},
  URL = {https://www.documentation.ird.fr/hor/fdi:010012725},
}