@article{fdi:010010390,
  title = {{R}elationships between spatial pattern of the endogeic earthworm {P}olypheretima elongata and soil heterogeneity},
  author = {{R}ossi, {J}.{P}. and {L}avelle, {P}. and {A}lbrecht, {A}lain},
  editor = {},
  language = {{ENG}},
  abstract = {{S}patial distribution of the endogeic earthworm #{P}olypheretima elongata$, soil texture, carbon and nitrogen contents were investigated in a 10-y-old pasture established on a vertisol, by measuring each variable at 57 points randomly located in a 25 x 60 m plot. {S}oil variables were measured at three depths : 0-10, 10-20 and 20-30 cm. {P}rincipal component analysis ({PCA}) of the data set showed the absence of relationships between density of #{P}. elongata$ and environmental variables. {T}he first principal component expressed a marked gradient of soil texture and soil organic matter ({SOM}). {S}ampling point coordinates on the first principal component axis were used as a composite variable assumed to account for the major source of soil heterogeneity at this site. {T}he spatial pattern of this variable and three age classes of #{P}. elongata$ were investigated using geostatistics. {T}here was no evidence of any relationship between soil heterogeneity and earthworm distribution. {P}opulation of #{P}. elongata$ exhibited a marked patchy distribution with opposite patterns between adults and other age classes (juveniles and cocoons). {T}hese results suggest at the study site processes responsible for the spatial distribution of #{P}. elongata$ population are of demographic rather than environmental origin. ({R}{\'e}sum{\'e} d'auteur)},
  keywords = {{LOMBRIC} ; {DISTRIBUTION} {SPATIALE} ; {TEXTURE} {DU} {SOL} ; {SITE} {TEMOIN} ; {CARBONE} ; {AZOTE} ; {ANALYSE} {EN} {COMPOSANTES} {PRINCIPALES} ; {MATIERE} {ORGANIQUE} ; {GEOSTATISTIQUE} ; {DYNAMIQUE} {DE} {POPULATION}},
  booktitle = {},
  journal = {{S}oil {B}iology and {B}iochemistry},
  volume = {29},
  numero = {3-4},
  pages = {485--488},
  ISSN = {0038-0717},
  year = {1997},
  DOI = {10.1016/{S}0038-0717(96)00105-8},
  URL = {https://www.documentation.ird.fr/hor/fdi:010010390},
}