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| Titel |
Nitrogen oxides emission from two beech forests subjected to different nitrogen loads |
| VerfasserIn |
B. Kitzler, S. Zechmeister-Boltenstern, C. Holtermann, U. Skiba, K. Butterbach-Bahl |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 3, no. 3 ; Nr. 3, no. 3 (2006-07-12), S.293-310 |
| Datensatznummer |
250001060
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| Publikation (Nr.) |
 copernicus.org/bg-3-293-2006.pdf |
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| Zusammenfassung |
| We analysed nitrogen oxides (N2O, NO) and carbon dioxide
(CO2) emissions from two beech forest soils close to Vienna, Austria,
which were exposed to different nitrogen input from the atmosphere. The site
Schottenwald (SW) received 20.2 kg N ha−1 y−1 and Klausenleopoldsdorf (KL)
12.6 kg N ha−1 y−1 through wet deposition. Nitric oxide emissions
from soil were measured hourly with an automatic dynamic chamber system.
Daily N2O measurements were carried out by an automatic gas sampling
system. Measurements of nitrous oxide (N2O) and CO2 emissions were
conducted over larger areas on a biweekly (SW) or monthly (KL) basis by
manually operated chambers. We used an autoregression procedure (time-series
analysis) for establishing time-lagged relationships between N-oxides
emissions and different climate, soil chemistry and N-deposition data. It
was found that changes in soil moisture and soil temperature significantly
effected CO2 and N-oxides emissions with a time lag of up to two weeks
and could explain up to 95% of the temporal variations of gas emissions.
Event emissions after rain or during freezing and thawing cycles contributed
significantly (for NO 50%) to overall N-oxides emissions. In the two-year
period of analysis the annual gaseous N2O emissions at SW ranged from 0.64
to 0.79 kg N ha−1 y−1 and NO emissions were 0.24 to 0.49 kg N ha−1 per
vegetation period. In KL significantly lower annual N2O
emissions (0.52 to 0.65 kg N2O-N kg ha−1 y−1) as well as considerably
lower NO-emissions were observed. During a three-month measurement campaign NO
emissions at KL were 0.02 kg N ha−1), whereas in the same time period significantly
more NO was emitted in SW (0.32 kg NO-N ha−1). Higher N-oxides
emissions, especially NO emissions from the high N-input site (SW) may indicate
that atmospheric deposition has an impact on emissions of gaseous N from
our forest soils. At KL there was a strong correlation between N-deposition
and N-emission over time, which shows that low N-input sites are especially
responsive to increasing N-inputs. |
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