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Quatorze types de structures physiques produites par des ingenieurs ecologiques ont ete echantillonnees a la surface du sol d'une savane colombienne. Les invertebres impliques dans leur production ont ete identifies. Une selection de proprietes physiques (taille et stabilite des agregats, densite apparente) et chimiques (teneur en C, N, P, etc) de ces structures ont ete evaluees. Trois groupes de...
Les formes d'humus ont ete decrites a l'aide d'une methode micromorphologique, sous la couronne des essences dominant la canopee dans deux sites de la foret semi-decidue de la Grande-Terre (Guadeloupe). Dans le vertisol d'une plantation forestiere, on observe un humus de type eumull sous toutes les essences. Cette forme d'humus resulte essentiellement de l'activite du ver de terre endoanecique Polypheretima...
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