Fluxos de nutrientes associados às descargas de água subterrânea para a Lagoa Mangueira (Rio Grande do Sul, Brasil)

Química Nova

Carlos F. F. Andrade²  Luis F. H. Niencheski²  Karina K. Attisano²  Marcio R. Milani²  Isaac R. Santos¹  Idel C. Milani¹ 

[1] ,Universidade Federal do Rio Grande Instituto de Oceanografia Rio Grande RS ,Brasil

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

DOI  :  10.1590/S0100-40422012000100002

来源: SciELO

【 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】

CC BY-NC   
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