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Seasonal variations of dissolved nitrogen and DOC:DON ratios in an intermittent Mediterranean stream

AuthorsBernal, Susana ; Butturini, Andrea ; Sabater, Francesc
KeywordsIntermittent stream
Dissolved inorganic nitrogen
Dissolved organic nitrogen
DOC:DON ratio
Issue Date2005
CitationBiogeochemistry 75: 351-372 (2005)
AbstractSeasonal variations of dissolved inorganic nitrogen (DIN) (NO3–N and NH4–N) and dissolved organic nitrogen (DON) were determined in Fuirosos, an intermittent stream draining an unpolluted Mediterranean forested catchment (10.5 km2) in Catalonia (Spain). The influence of flow on streamwater concentrations and seasonal differences in quality and origin of dissolved organic matter, inferred from dissolved organic carbon to nitrogen ratios (DOC:DON ratios), were examined. During baseflow conditions, nitrate and ammonium had opposite behaviour, probably controlled by biological processes such as vegetation uptake and mineralization activity. DON concentrations did not have a seasonal trend. During storms, nitrate and DON increased by several times but discharge was not a good predictor of nutrient concentrations. DOC:DON ratios in streamwater were around 26, except during the months following drought when DOC:DON ratios ranged between 42 and 20 during baseflow and stormflow conditions, respectively. Annual N export during 2000–2001 was 70 kg km 1 year 1, of which 75% was delivered during stormflow. The relative contribution of nitrogen forms to the total annual export was 57, 35 and 8% as NO3–N, DON and NH4–N, respectively.
Description22 páginas, 6 figuras, 4 tablas.
Publisher version (URL)http://dx.doi.org/10.1007/s10533-005-1246-7
Appears in Collections:(CEAB) Artículos
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