%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES
%A Rossi, J.P.
%A Lavelle, P.
%A Albrecht, Alain
%T Relationships between spatial pattern of the endogeic earthworm Polypheretima elongata and soil heterogeneity
%D 1997
%L fdi:010010390
%G ENG
%J Soil Biology and Biochemistry
%@ 0038-0717
%K LOMBRIC ; DISTRIBUTION SPATIALE ; TEXTURE DU SOL ; SITE TEMOIN ; CARBONE ; AZOTE ; ANALYSE EN COMPOSANTES PRINCIPALES ; MATIERE ORGANIQUE ; GEOSTATISTIQUE ; DYNAMIQUE DE POPULATION
%N 3-4
%P 485-488
%R 10.1016/S0038-0717(96)00105-8
%U https://www.documentation.ird.fr/hor/fdi:010010390
%> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_47-48/010010390.pdf
%V 29
%W Horizon (IRD)
%X Spatial distribution of the endogeic earthworm #Polypheretima elongata$, soil texture, carbon and nitrogen contents were investigated in a 10-y-old pasture established on a vertisol, by measuring each variable at 57 points randomly located in a 25 x 60 m plot. Soil variables were measured at three depths : 0-10, 10-20 and 20-30 cm. Principal component analysis (PCA) of the data set showed the absence of relationships between density of #P. elongata$ and environmental variables. The first principal component expressed a marked gradient of soil texture and soil organic matter (SOM). Sampling 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. The spatial pattern of this variable and three age classes of #P. elongata$ were investigated using geostatistics. There was no evidence of any relationship between soil heterogeneity and earthworm distribution. Population of #P. elongata$ exhibited a marked patchy distribution with opposite patterns between adults and other age classes (juveniles and cocoons). These results suggest at the study site processes responsible for the spatial distribution of #P. elongata$ population are of demographic rather than environmental origin. (Résumé d'auteur)
%$ 074FAUSOL02