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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...