Nutrients fluxes from groundwater discharge into Mangueira Lagoon (Rio Grande do Sul, Brasil)

Química Nova

Universidade Federal do Rio Grande, Rio Grande, Brasil¹  Niencheski, Luis F. H.¹  Universidade Federal de Pelotas, Pelotas, Brasil¹  Milani, Marcio R.¹  Andrade, Carlos F. F.¹  Attisano, Karina K.¹  Santos, Isaac R.¹  Florida State University, Tallahassee, United States of America¹  Milani, Idel C.¹ 

关键词: nutrients;    coastal lagoons;    submarine groundwater discharge.;   

DOI  :  10.1590/S0100-40422012000100002

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

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.

【 授权许可】

Unknown