摘要：This article reports results from the first one hectare forest inventory carried out atop a geoglyph. To date almost all the geoglyphs that have been studied have lacked forest cover. The geoglyph of Três Vertentes exhibits no evidence of having been burned or used for agriculture or settlement in the recente past. As such, it is likely the vegetation extant on the geoglyph has been essentially undisturbed with the possible exception of occasional extractive uses such as hunting of game and scoring of rubber trees (Hevea brasiliensis). The forest of the geoglyph is a vine forest. This is substantiated by the large percentage of dicotyledenous trees covered in vines; the high density and frequency of moraceous species, many of which are vines or stranglers; the high density and frequency of palms, which exclude vines; the high frequency of wild bananas (Phenakospermum guyannense); the relatively low total basal área and small number of individuals ? 10 cm dbh inside one hectare of forest. What is surprising is the fact that one of every two to three individuals ? 10 cm dbh on the plot represents a new species. The conclusion we draw from these data is that the original engineers and builders of the geoglyphs did not leave a legacy of species poverty and environmental degradation. Keywords : forest inventory , Amazon archeology, biodiversity .
