Nutrients fluxes from groundwater discharge into Mangueira Lagoon (Rio Grande do Sul, Brasil)
Andrade, CFF, Niencheski, LFH, Attisano, KK, Milani, MR, Santos, IR & Milani, IC 2012, 'Nutrients fluxes from groundwater discharge into Mangueira Lagoon (Rio Grande do Sul, Brasil)', Química Nova, vol. 35, no. 1, pp. 5-10.
This study assesses the importance of groundwater discharge to dissolved nutrient levels in Mangueira Lagoon. A transect of an irrigation canal in the margin of Lagoon demonstrated a strong geochemical gradient due to high groundwater inputs in this area. Using 222Rn as a quantitative groundwater tracer, we observed that the flux of dissolved inorganic nitrogen (DIN), silicate and phosphate (1178 and 1977; 26190 and 35652; 167 and 188 mol d-1 for winter and summer, respectively) can continually supply/sustain primary production. The irrigation canals act as an artificial underground tributary and represent a new source of nutrients to coastal lagoons.