@article{fdi:010037964,
  title = {{T}his ped is my ped : visual separation and near infrared spectra allow determination of the origins of soil macroaggregates},
  author = {{V}elasquez, {E}lena and {P}elosi, {C}. and {B}runet, {D}idier and {G}rimaldi, {M}ichel and {M}artins, {M}. and {R}endeiro, {A}. {C}. and {B}arrios, {E}. and {L}avelle, {P}atrick},
  editor = {},
  language = {{ENG}},
  abstract = {{M}acroaggregation is a highly dynamic attribute of soils that is claimed to have a significant impact on their ability to store {C} and conserve nutrients. {A} major obstacle to the description and modelling of macroaggregate dynamics, and of the associated processes, is an almost complete ignorance of the real origin of the different types of aggregates found in soils, their turnover times and positions in the soil matrix. {W}e present here a general methodological approach in which the origin of aggregates separated according to visual criteria could be determined by comparing their specific organic matter signatures assessed by {N}ear {I}nfrared {S}pectrometry ({NIRS}) to signatures of biogenic structures produced by soil ecosystem engineers (invertebrates and roots) living in the same soil. {M}acroaggregates and other soil components were separated visually from samples taken at 61 locations regularly distributed across a watershed in {N}icaragua and representing crops, pastures, forests, coffee plantations and fallows. {C}oinertia analyses among soil macroinvertebrate communities and the matrix of soil morphological variables showed highly significant relationships. {I}n {A}mazonian forest patches and pastures from the state of {P}ara in {B}razil, 75 different types of biogenic structures were collected at the soil surface and on tree trunks, and analysed by the {NIRS} spectral. method. {S}ignificant differences among the different types of structures allowed grouping according to their broad phylogenetic origin with large interspecifc differences. {I}n a field experiment conducted at the same site, soils previously under pastures were planted in 16 possible combinations of four plant species, in a fully randomized design replicated three times in different sites. {S}urface casts of the earthworm species {A}ndiodrilus pachoensis and soil macroaggregates separated by our visual technique had significantly different spectral. signatures depending on the {L}ocation of the plot and the composition of plant cover. {H}owever, the comparison of {NIRS} signatures of soil macroaggregates and casts suggested that {A}ndiodrilus pachoensis was not responsible for the production of the biogenic aggregates that comprised a large proportion on the soil volume in this soil.},
  keywords = {soil aggregation ; macroinvertebrates ; {NIRS} ; soil morphology ; tropical soils},
  booktitle = {},
  journal = {{P}edobiologia},
  volume = {51},
  numero = {1},
  pages = {75--87},
  ISSN = {0031-4056},
  year = {2007},
  DOI = {10.1016/j.pedobi.2007.01.002},
  URL = {https://www.documentation.ird.fr/hor/fdi:010037964},
}