Resumo

LARENAS PARADA, Giovanna; DE VIANA, Marta L; CHAFATINOS, Teodoro  e  ESCOBAR, Nieves E. Soil-invasive species (Tithonia tubaeformis) relationship in the riparian system of the Arenales River, Salta, Argentina. Ecol. austral [online]. 2004, vol.14, n.1, pp.19-29. ISSN 1667-782X.

Biological invasions are an important subject of research closely related to biodiversity loss, causing also important economic problems. Salta City is located in the Lerma Valley, a region invaded by Tithonia tubaeformis, a species from Central America. This study was carried out in the Arias-Arenales riparian system, in the urban area, characterized by numerous and different human alterations. The density of the invader was different in the studied sites and was higher in Tavella and Santa Lucía. In the later site there were only exotic species. San Javier showed the greatest plant species richness (33), as well as the higher proportion of native species (85%). Topsoil in invaded sites had the highest potassium concentrations. Taking into account the physico-chemical characteristics of the soil and vegetation features, we obtained a grouping of the sites related with invader densities.

Palavras-chave : Invasion; Nutrients; Density; Exotic and native plants.

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