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| Titel |
Modelling the inorganic nitrogen behaviour in a small Mediterranean forested catchment, Fuirosos (Catalonia) |
| VerfasserIn |
C. Medici, S. Bernal, A. Butturini, F. Sabater, M. Martin, A. J. Wade, F. Francés |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 14, no. 2 ; Nr. 14, no. 2 (2010-02-08), S.223-237 |
| Datensatznummer |
250012178
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| Publikation (Nr.) |
 copernicus.org/hess-14-223-2010.pdf |
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| Zusammenfassung |
| The aim of this work was to couple a nitrogen (N) sub-model to already
existent hydrological lumped (LU4-N) and semi-distributed (LU4-R-N and
SD4-R-N) conceptual models, to improve our understanding of the factors and
processes controlling nitrogen cycling and losses in Mediterranean
catchments. The N model adopted provides a simplified conceptualization of
the soil nitrogen cycle considering mineralization, nitrification,
immobilization, denitrification, plant uptake, and ammonium
adsorption/desorption. It also includes nitrification and denitrification in
the shallow perched aquifer. We included a soil moisture threshold for all
the considered soil biological processes. The results suggested that all the
nitrogen processes were highly influenced by the rain episodes and that soil
microbial processes occurred in pulses stimulated by soil moisture
increasing after rain. Our simulation highlighted the riparian zone as a
possible source of nitrate, especially after the summer drought period, but
it can also act as an important sink of nitrate due to denitrification, in
particular during the wettest period of the year. The riparian zone was a
key element to simulate the catchment nitrate behaviour. The lumped LU4-N
model (which does not include the riparian zone) could not be validated,
while both the semi-distributed LU4-R-N and SD4-R-N model (which include the
riparian zone) gave satisfactory results for the calibration process and
acceptable results for the temporal validation process. |
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