GABELLONE Nestor Adrian
Caracterización espacial del río Salado (Buenos Aires) a partir de concentraciones de fósforo total
NESCHUK, NANCY CAROLINA; GABELLONE, N. A.; CLAPS, MARÍA CRISTINA
Diversidad y Ambiente
Universidad de Flores
Año: 2002 vol. 1 p. 13 - 19
The Salado river, the main river of Buenos Aires province (length 700 km and a catchment area of 90000 km2), draining one of the most important agricultura1 region of the country, has influence over 50 counties. The basin suffers human impact (urban and industrial effluents, channel construction, modification of the main course) that generates changes not evaluated until the present. Water samples were collected seasonally between June 1998 and May 1999 in thirteen monitoring stations covering the main channel and more important tributaries. The aim of the study is to characterise spatial and temporally the Salado's river basin through TP concentrations, evaluating the quality of water and the impact of different land use. Concentrations of total phosphorus (TP) were analysed according to APHA (1995). The results allowed to identify three sectors: 1) Upstream basin with the highest TP concentrations (1260 pg l"), 2) Tributaries (Vallimanca-Saladillo and Las Flores streams) with the lowest one (391 pg T1) and3) downstream basin with the medium concentrations (603 pg T1). The phosphorus input at the third sector corresponds to upstream incorporation (agriculture runoñj &er that dilution action of tributaries instad a local input. The variations of TP concentmions are aüributed to land use changes, channel inputs and hydrological conditions.