@article{fdi:010007516,
  title = {{E}valuation and proposed revisions of criteria for andosols in the world reference base for soil resources},
  author = {{S}hoji, {S}. and {N}anzyo, {M}. and {D}ahlgren, {R}.{A}. and {Q}uantin, {P}aul},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he proposed criteria for andosol classification in the {W}orld {R}eference {B}ase ({WRB}) of {S}oil {R}esources were evaluated using the {T}ohoku {U}niversity {W}orld {A}ndosol {D}atabase ({TUWAD}). {T}he {WRB} proposal defines a diagnostic andic horizon comprised of vitr-andic, alu-andic, and sil-andic subtypes, and eight second level soil units. {S}everal notable refinements to the {WRB} criteria were apparent from evaluation of soil properties from {TUWAD} and are proposed as revised criteria. {O}ur analysis indicated that the most effective criteria for differentiating the andic horizon were glass content, phosphate retention, oxalate extractable {A}l and {F}e, pyrophosphate-extractable {A}l, and bulk density. {T}he vitr-andic horizon is distinguished by its low degree of weathering, evident from its low oxalate extractable {A}l and {F}e, low {P} retention, and high glass content. {T}he ratio of pyrophosphate to oxalate extractable {A}l is used to separate andic horizons dominated by {A}l-humus, complexes (alu-andic, {A}l(p)/{A}l(o) greater or equal than 0.5), from those dominated by allophanic materials (sil-andic, {A}l(p)/{A}l(o) < 0.5). {W}hen {A}l(p) data are not availabe, the {S}i(o) value of 0.6 could be used as an approximate criteria. {W}e also propose revisions to the nine second level soil units based on the dominant pedogenic processes occurring in andosols : non-crystalline material formation and organic matter accumulation. {T}hese soil units are based on the degree of weathering (oxalate extractable {A}l, {F}e, glass content), the dominant weathering agent (organic acids vs. carbonic acid), type (melanic or fulvic) and quantity of organic matter, and high 1.5 {MP}a water-holding capacity. {T}he revised criteria determined by this study effectively differentiate andosols based on their dominant pedogenic processes, and the relationship or soil properties to productivity and utilization. ({R}{\'e}sum{\'e} d'auteur)},
  keywords = {{SOL} ; {TYPOLOGIE} ; {CLASSIFICATION} ; {PEDOGENESE} ; {APTITUDE} {DU} {SOL} ; {CARACTERISTIQUE} {CHIMIQUE} ; {ALUMINIUM} ; {SILICE} ; {ANDOSOL}},
  booktitle = {},
  journal = {{S}oil {S}cience},
  volume = {161},
  numero = {9},
  pages = {604--615},
  ISSN = {0038-075{X}},
  year = {1996},
  DOI = {10.1097/00010694-199609000-00005},
  URL = {https://www.documentation.ird.fr/hor/fdi:010007516},
}