 |
| Titel |
Lacustrine wetland in an agricultural catchment: nitrogen removal and related biogeochemical processes |
| VerfasserIn |
R. Balestrini, C. Arese, C. Delconte |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1027-5606
|
| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 12, no. 2 ; Nr. 12, no. 2 (2008-03-10), S.539-550 |
| Datensatznummer |
250010575
|
| Publikation (Nr.) |
 copernicus.org/hess-12-539-2008.pdf |
|
|
|
|
|
| Zusammenfassung |
| 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–, SO42–,
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. The pluviometric regime, the temperature, the
organic carbon availability and the hydrogeomorphic properties are the main
environmental factors affecting the N transformations in the studied
lacustrine ecosystem. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|