@article{fdi:010040795,
  title = {{I}nfluence of changes in land use and earthworm activities on carbon and nitrogen dynamics in a steepland ecosystem in {N}orthern {V}ietnam},
  author = {{J}ouquet, {P}ascal and {B}ernhard {R}eversat, {F}rance and {B}ottinelli, {N}icolas and {O}range, {D}idier and {R}ouland {L}ef{\`e}vre, {C}orinne and {T}ran {D}uc, {T}oan and {P}odwojewski, {P}ascal},
  editor = {},
  language = {{ENG}},
  abstract = {{T}his manuscript focuses on the effects of land-use change and earthworm activities on the dynamics of dissolved nutrients (carbon and mineral nitrogen) in a steep slope ecosystem in {N}orthern {V}ietnam. {W}e investigated the properties of soil aggregates (casts and surrounding soils) sampled in different agrosystems: a plantation of {B}racharia ruzziziensis ({BRA}), a fallow ({FAL}) and a plantation of {A}cacia mangium and {V}enicia montana ({FOR}), following a cultivation of cassava ({CAS}), and a fallow after a forest of {E}ucalyptus ({EUC}). {S}oil physical, chemical and biological properties were determined on the sampling date and dissolved organic {C} ({DOC}), and mineral {N} ({N} (min)) contents were followed during a 21-day incubation period. {CAS}, {BRA} and {FOR} were characterised by a high rate of {N} mineralisation, followed by a rapid loss of {N} (min). {C}onversely, {FAL} and {EUC} were more interesting in terms of soil fertility because these systems had higher soil {N} (min) content that could become available to plants. {L}ost of {C} through {DOC} leaching was very low with values ever less than 0.5% of the total soil {C} content. {T}he greatest lost of {C} through leaching was in {FAL}, {EUC} and {FOR}. {T}he impacts of earthworms on the soil seemed site-specific. {T}he protection of organic matter in earthworm casts varied with the initial substrate soil and agroecosystem management. {C}asts were characterised by greater enzymatic activities, except for alkaline phosphatase, than the surrounding soil. {W}hile {SOM} mineralisation was not affected in casts collected in {FAL}, {EUC} and {FOR}, the leaching of {N} (min) was increased over the surrounding soil. {C}onversely, mineralisation of {SOM} and nitrification activity were less in {BRA}-casts than in the surrounding soil, causing a greater retention of {N} (min) in soil. {W}hile the {DOC} leached from casts increased in {BRA}, it was reduced in {FAL} and was similar in the other sites. {O}ur study indicates that while land-use change occurred only 3 years ago, the extent of leaching was mostly regulated by the type of agroecosystem and by earthworm activities.},
  keywords = {cassava ; land use change ; dissolved organic carbon ; mineral nitrogen ; earthworms},
  booktitle = {},
  journal = {{B}iology and {F}ertility of {S}oils},
  volume = {44},
  numero = {1},
  pages = {69--77},
  ISSN = {0178-2762},
  year = {2007},
  DOI = {10.1007/s00374-007-0179-9},
  URL = {https://www.documentation.ird.fr/hor/fdi:010040795},
}