@article{fdi:010089477,
  title = {{L}and use determines the composition and stability of organic carbon in earthworm casts under tropical conditions},
  author = {{S}ong, {C}. and {B}ottinelli, {N}icolas and {T}ran, {T}. {M}. and {R}uiz, {F}. and {C}olombini, {G}abin and {Z}i, {Y}. and {J}ouquet, {P}ascal and {R}umpel, {C}.},
  editor = {},
  language = {{ENG}},
  abstract = {{E}nvironmental conditions play an important role in controlling the fate of organic carbon ({OC}) in earthworm casts. {H}owever, the mechanisms that lead to the destabilization of {OC} in casts deposited in different land use systems are poorly understood. {I}n this study, we investigated the impact of land use on the fate and composition of particulate organic matter ({POM}) and mineral-associated organic matter ({MAOM}) in earthworm casts under tropical conditions. {W}e conducted a 400-day field exposure experiment in a woodland and a meadow in northern {V}ietnam with earthworm casts and soil aggregates without trace of earthworm activity (reference soil) under natural rainfall conditions. {W}e analyzed the element content, stable carbon isotope composition and midinfrared signatures of the two types of materials after 9 and 400 days of field exposure. {T}he results showed that the casts were initially enriched in {OC} as compared to the reference soils, with the {MAOM} fraction accounting for over 90% of the earthworm-induced {OC} accumulation. {T}he {POM} fraction occluded in casts consisted of fresh plant material and disappeared during the 400 days of field exposure. {E}nrichment and composition of {OC} differed between woodland and meadow casts. {POM} and {MAOM} showed contrasting persistence in the two land use systems. {W}hile woodland casts showed the highest potential to stabilize {OC}, the actual amount of cast {OC} stabilized for more than 400 days was more important under meadow. {T}he processes affecting cast {OC} dynamics were contrasting in both systems. {U}nder woodland, cast {OC} destabilization was most probably related to microbial degradation, while under meadow, {OC} accumulation was most probably related to root activity. {O}ur study highlights that the impact of earthworms on the origin, composition, and fate of cast {OC} in tropical environments is strongly influenced by land use.},
  keywords = {{B}ioturbation ; {L}and uses ; {M}acrofauna ; {FTIR} spectroscopy ; {VIET} {NAM} ; {ZONE} {TROPICALE}},
  booktitle = {},
  journal = {{S}oil {B}iology and {B}iochemistry},
  volume = {190},
  numero = {},
  pages = {109291 [8 p.]},
  ISSN = {0038-0717},
  year = {2024},
  DOI = {10.1016/j.soilbio.2023.109291},
  URL = {https://www.documentation.ird.fr/hor/fdi:010089477},
}