Dubroeucq Didier, Geissert D., Roger Pierre-Armand. (1997). Pine root-induced petrocalcic horizons in volcanic ash soils of the mexican altiplano. In :
Zebrowski Claude (ed.), Quantin Paul (ed.), Trujillo G. (ed.), Villamar M.D. (collab.). Suelos volcanicos endurecidos. Quito (ECU) ; Quito (ECU) ; Quito (ECU) ; Quito : UE ; ORSTOM ; PUCE ; UCE, p. 98-106. Suelos Volcanicos Endurecidos, 3., Quito (ECU), 1996/12/9-14.
Titre du document
Pine root-induced petrocalcic horizons in volcanic ash soils of the mexican altiplano
Année de publication
1997
Type de document
Colloque
Auteurs
Dubroeucq Didier, Geissert D., Roger Pierre-Armand
In
Zebrowski Claude (ed.), Quantin Paul (ed.), Trujillo G. (ed.), Villamar M.D. (collab.) Suelos volcanicos endurecidos
Source
Quito (ECU) ; Quito (ECU) ; Quito (ECU) ; Quito : UE ; ORSTOM ; PUCE ; UCE, 1997,
p. 98-106
Colloque
Suelos Volcanicos Endurecidos, 3., Quito (ECU), 1996/12/9-14
Scanning electron microscope (SEM) studies of calcareous encrusting in volcanic ash soils containing active and petrified roots of pine trees revealed that the calcified material is related to the fine root mat of the pine rhizosphere and particulary to a dense network of very thin biologic filaments of about 0,1um in diameter to 0,5um. The diversity in morphology of the calcitic accretions from fibers to rods with epitaxial growth of an hedral crystals, results from different stages in the calcification. In the first stage, freshly calcified filaments are semi-rigid and coated with gel-like products composed mainly of Ca, Al and Si. In the most advanced stages, secondary anhedral calcite crystals a few microns in size develop on the biologic structures and form an open network with the accumulated debris of calcified filaments. Amorphous silica, as a cementing agent, contributes to the hardening of this porous calcitic fabric. The most advanced stages of calcification are observed in soils below 30 to 50 years old pine trees, whereas 15 years old pine plantations display only filamentous and needly-fiber calcifications. (Résumé d'auteur).
Plan de classement
Constituants et propriétés des sols [068PROSOL]
Descripteurs
PROFIL PEDOLOGIQUE ; CENDRE VOLCANIQUE ; RELATION SOL PLANTE ; CALCITE ; BIOGENESE ; STRUCTURE CHIMIQUE ; CROUTE CALCAIRE ; SOL VOLCANIQUE ; PIN
Description Géographique
MEXIQUE
Localisation
Fonds IRD [F A010012910] ;
Montpellier (Centre IRD)
;
Quito
Identifiant IRD
fdi:010012916
