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Wright, Richard F. ; Alewell, Christine ; Cullen, J. M. ; Evans, Christopher D. ; Marchetto, Aldo ; Moldan, Filip ; Prechtel, Annette ; Rogora, Michela:
Trends in nitrogen deposition and leaching in acid-sensitive streams in Europe.
In: Hydrology and Earth System Sciences.
Bd. 5
(2001)
Heft 3
.
- S. 299-310.
ISSN 1607-7938
DOI: https://doi.org/10.5194/hess-5-299-2001
Abstract
Long-term records of nitrogen in deposition and streamwater were analysed at 30 sites covering major acid sensitive regions in Europe. Largeregions of Europe have received high inputs of inorganic nitrogen for the past 20-30 years, with an approximate 20% decline in central andnorthern Europe during the late 1990s. Nitrate concentrations in streamwaters are related to the amount of N deposition. All sites with lessthan 10 kgN ha-1 yr-1 deposition have low concentrations of nitrate in streamwater, whereas all sites receiving > 25 kgN ha-1 yr-1 have elevatedconcentrations. Very few of the sites exhibit significant trends in nitrate concentrations; similar analyses on other datasets also show fewsignificant trends. Nitrogen saturation is thus a process requiring many decades, at least at levels of N deposition typical for Europe. Declinesin nitrate concentrations at a few sites may reflect recent declines in N deposition. The overall lack of significant trends in nitrate concentrationsin streams in Europe may be the result of two opposing factors. Continued high deposition of nitrogen (above the 10 kgN ha-1 yr-1 threshold)should tend to increase N saturation and give increased nitrate concentrations in run-off, whereas the decline in N deposition over the past 5–10 years in large parts of Europe should give decreased nitrate concentrations in run-off. Short and long-term variations in climate affectnitrate concentrations in streamwater and, thus, contribute “noise” which masks long-term trends. Empirical data for geographic pattern andlong-term trends in response of surface waters to changes in N deposition set the premises for predicting future contributions of nitrate toacidification of soils and surface waters. Quantification of processes governing nitrogen retention and loss in semi-natural terrestrial ecosystemsis a scientific challenge of increasing importance.
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| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Zusätzliche Informationen: | BAYCEER7533 |
| Keywords: | Europe; acid deposition; nitrogen; saturation; recovery; water |
| Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Bodenökologie Forschungseinrichtungen > Zentrale wissenschaftliche Einrichtungen > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER Fakultäten Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften Forschungseinrichtungen Forschungseinrichtungen > Zentrale wissenschaftliche Einrichtungen |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik |
| Eingestellt am: | 09 Okt 2015 05:56 |
| Letzte Änderung: | 28 Okt 2024 13:01 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/20272 |