Hydrology and Earth System Sciences www.hydrol-earth-syst-sci.net 1027-5606 1607-7938 12 2 2008 10.5194/hess-12-539-2008 http://www.hydrol-earth-syst-sci.net/12/539/2008/ http://www.hydrol-earth-syst-sci.net/12/539/2008/hess-12-539-2008.html http://www.hydrol-earth-syst-sci.net/12/539/2008/hess-12-539-2008.pdf 539 550 2008-03-10 Lacustrine wetland in an agricultural catchment: nitrogen removal and related biogeochemical processes R. Balestrini balestrini@irsa.cnr.it C. Arese C. Delconte Water Research Institute (IRSA-CNR), via della Mornera 25, Brugherio 20047, Milano, Italy The role of specific catchment areas, such as the soil-river or lake interfaces, in removing or buffering the flux of N from terrestrial to aquatic ecosystems is globally recognized but the extreme variability of microbiological and hydrological processes make it difficult to predict the extent to which different wetlands function as buffer systems. In this paper we evaluate the degree to which biogeochemical processes in a lacustrine wetland are responsible for the nitrate removal from ground waters feeding Candia Lake (Northern Italy). A transect of 18 piezometers was installed perpendicular to the shoreline, in a sub-unit formed by 80 m of poplar plantation, close to a crop field and 30 m of reed swamp. The chemical analysis revealed a drastic NO₃^–-N ground water depletion from the crop field to the lake, with concentrations decreasing from 15–18 mg N/l to the detection limit within the reeds. Patterns of Cl^–, SO₄^2–, O₂, NO₂^–-N, HCO₃^– and DOC suggest that the metabolic activity of bacterial communities, based on the differential use of electron donors and acceptors in redox reactions is the key function of this system. The significant inverse relationship found between NO₃^–-N and HCO₃^– is a valuable indicator of the denitrification activity. 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