@article{fdi:010092897,
  title = {{N} cycling increase after savanna afforestation with {E}ucalyptus or {A}cacia is reflected in the growth of soil ammonia-oxidizing archaea and nematode bacterial-feeders},
  author = {{S}auvadet, {M}. and {H}armand, {J}. {M}. and {D}eleporte, {P}. and {M}artin, {A}run and {Z}arah-{S}hailia, {F}. and {V}illenave, {C}. and {J}imenez, {A}. and {M}areschal, {L}. and {B}ouillet, {J}. {P}. and {L}aclau, {J}. {P}. and {P}lassard, {C}. and {T}rap, {J}ean and {R}obin, {A}ntoine},
  editor = {},
  language = {{ENG}},
  abstract = {{I}n tropical humid {A}frica, sandy soils under periodically burnt herbaceous savannas exhibit generally low carbon ({C}) content and nitrogen ({N}) availability. {S}avanna afforestation may overcome these limitations through changes in soil functioning, yet these processes still need to be explored. {I}n this study, we investigated whether changes in the composition of soil micro-food web may explain soil {C} and {N} cycling increases following savanna afforestation. {W}e conducted a 7-year experiment in {C}ongo including {E}ucalyptus and {N}2-fixing {A}cacia monocultures and {E}ucalyptus-{A}cacia mixtures established on former herbaceous savannas. {W}e assessed in each of these modalities the soil attributes: organic {C} and {N}, p{HH}2{O}, nitrate, ammonium, net {C} and {N} mineralization and nitrification rates, along with the abundances of bacteria, fungi, nematodes, ammonia-oxidizing archaea ({AOA}) and bacteria ({AOB}) in the top 10 cm layer. {A}fforestation of savannas with {E}ucalyptus for timber production increased soil {C} by 1.7 times, soil net {N} mineralization rates by 1.9 times and soil inorganic nitrogen by 2.5 times. {M}ixed {A}cacia{E}ucalyptus and {A}cacia monoculture plantations further improved the rate of net nitrogen mineralization by a factor of 1.4 and soil inorganic {N} by a factor of 2.3 compared with {E}ucalyptus monocultures. {T}hese changes were associated with a gradual increase in {AOA} abundance from savanna to {E}ucalyptus monoculture, {E}ucalyptus-{A}cacia mixtures and finally {A}cacia monoculture. {S}avanna afforestation resulted in a significant increase in the absolute abundance of bacterial-feeding nematodes by 678 %, but to a decrease in the abundance of both fungal-feeders, and omnivores and predators. {I}ncrease in {N} cycling was positively associated with both {AOA} and nematode bacterial-feeder abundances, underlining the importance of monitoring micro-food web structure to understand better how land use changes affect soil biogeochemical cycling in the context of tropical afforestation.},
  keywords = {{A}mmonia-oxidizing archae ({AOA}) ; {B}acteria ; {F}ungi ; {N}ematodes ; {L}and use ; change ; {N}2-fixing trees ; {CONGO} ; {ZONE} {TROPICALE}},
  booktitle = {},
  journal = {{A}pplied {S}oil {E}cology},
  volume = {209},
  numero = {},
  pages = {106027 [9 p.]},
  ISSN = {0929-1393},
  year = {2025},
  DOI = {10.1016/j.apsoil.2025.106027},
  URL = {https://www.documentation.ird.fr/hor/fdi:010092897},
}