@article{fdi:010042688,
  title = {{E}ffects of nitrogen availability on microbial activities, densities and functional diversities involved in the degradation of a {M}editerranean evergreen oak litter ({Q}uercus ilex {L}.)},
  author = {{A}larcon-{G}uti{\'e}rrez, {E}. and {C}ouchaud, {B}. and {A}ugur, {C}hristopher and {C}alvert, {V}. and {C}riquet, {S}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he effect of available nitrogen {N} (({NH}4)(2){SO}4) amendments on various microbial variables in three different layers ({O}h{L}n, {O}h{L}v, {O}h{L}f) of a {M}editerranean litter profile under an evergreen oak forest ({Q}uercus ilex {L}.) were studied. {S}ince {M}editerranean litters are generally {N} limiting, the goal of the study was to understand how low (0.1 and 1 %) and high (5 and 10%) {N} amendments impact specific biological variables such as hyphal length, community-level-catabolic-profiles ({CLCP}s) in {ECO} and {FF} {B}iolog ({TM}) plates, basal respiration, enzymatic activities (i.e. alkaline phosphatases ({AIP}), laccases, peroxidases and cellulases), and laccase and cellulase isoforms from three different litter layers. {R}esults indicated that the effects of {N} amendments occurred over very short incubation time (3 d), and varied depending on {N} concentration and litter organic matter ({OM}) quality (i.e. depth). {T}hus, it appeared that the more active layer was the intermediate ({O}h{L}v) layer, which probably contained the most labile and available {C} pools. {A}s a consequence, {O}h{L}v was also the layer showing globally the more intensive microbial responses following low {N} amendments. {I}ndeed, in this layer, low {N} supplies caused several marked increases in enzymes activities (i.e. laccases, cellulases and alkaline phosphatases), hyphal length and isoenzyme patterns, suggesting a microbial reallocation of {C} to biomass and enzyme production. {O}n the contrary, high {N} supplies resulted in adverse effects on almost all the variables, suggesting repression or cytotoxic phenomena.},
  keywords = {{N} limiting ; {R}esources allocation theory ; {Z}ymograms ; {L}itter quality},
  booktitle = {},
  journal = {{S}oil {B}iology and {B}iochemistry},
  volume = {40},
  numero = {7},
  pages = {1654--1661},
  ISSN = {0038-0717},
  year = {2008},
  DOI = {10.1016/j.soilbio.2008.01.020},
  URL = {https://www.documentation.ird.fr/hor/fdi:010042688},
}