期刊
HYDROBIOLOGIA
卷 737, 期 1, 页码 183-200出版社
SPRINGER
DOI: 10.1007/s10750-013-1688-1
关键词
Denitrification; Nitrogen assimilation; Rooted macrophytes; Microphytobenthos; Shallow freshwater environments; Pit lakes
资金
- Italian Ministry of University and Research [PRIN 428 2008]
- Bassanetti s.r.l. (Monticelli d'Ongina, Piacenza)
The influence of Potamogeton pectinatus colonisation on benthic nitrogen dynamics was studied in the littoral zone of a lowland pit lake with high nitrate concentration (similar to 200 mu M). Our hypothesis was that in aquatic environments where nitrogen availability is not limiting, colonisation by rooted macrophytes changes the dynamics of the benthic nitrogen cycle, stimulating N assimilation and denitrification and increasing the system capacity to take up external nitrogen loads. To test this hypothesis, we quantified and compared seasonal variations of light and dark benthic metabolism, dissolved inorganic nitrogen (DIN) fluxes, denitrification and N assimilation rates in an area colonised by P. pectinatus and a reference site colonised by microphytobenthos. In both areas, the benthic system was net autotrophic and a sink for DIN (2,241-2,644 mmol m(-2) y(-1)). Plant colonisation increased nitrogen losses via denitrification by 30% compared to the unvegetated area. In contrast to what is generally observed in coastal marine systems, where the presence of rooted macrophytes limits denitrification rates, under the very high nitrate concentrations in the studied lake, both denitrification (1,237-1,570 mmol m(-2) y(-1)) and N assimilation (1,039-1,095 mmol m(-2) y(-1)) played important and comparable roles in the removal of DIN from the water column.
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