Horizon 1 1 17 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES Biology and Fertility of Soils 839-844 Earthworm casts NIR spectral signature Soil macroaggregates Aporrectodea caliginosa 2009 fdi:010046334 ENG Biology and Fertility of Soils 0178-2762 ISI:000269418000006 8 10.1007/s00374-009-0395-6 https://www.documentation.ird.fr/hor/fdi:010046334 https://www.documentation.ird.fr/intranet/publi/2009/09/010046334.pdf 45 Horizon (IRD) Sub-adult individuals of Aporrectodea caliginosa were incubated for 16 weeks under laboratory cultures in a soil treated with 0%, 10% or 50% of a Populus nigra half-decomposed leaves, respectively. Growth was maximum in the 50% organic matter treatment and cocoon production occurred. Average soil ingestion rates decreased from 1.56 g/g(-1) fresh weight of worm per day(-1) in control soil to 1.17 and 0.5 g, respectively, in treatments with 10% and 50% half-decomposed litter. Surface casts never comprised more than 10% of total cast production. Near-infrared spectrometry (NIRS)signatures of digested and non-ingested soil significantly differed and showed a rather constant effect of digestion, independent of the organic matter content (p < 0.01). These results confirm the value of NIRS spectral signatures as indicators of the origin of soil aggregates and biological processes involved in soil aggregation. 074 ; 068 UR211 / UR179 Chine / Colombie