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| Titel |
Nitrous oxide emissions from soil of an African rain forest in Ghana |
| VerfasserIn |
S. Castaldi, T. Bertolini, A. Valente, T. Chiti, R. Valentini |
| 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 ; 10, no. 6 ; Nr. 10, no. 6 (2013-06-22), S.4179-4187 |
| Datensatznummer |
250018306
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| Publikation (Nr.) |
 copernicus.org/bg-10-4179-2013.pdf |
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| Zusammenfassung |
| Recent atmospheric studies have evidenced the imprint of large N2O
sources in tropical/subtropical lands. This source might be attributed to
agricultural areas as well as to natural humid ecosystems. The uncertainty
related to both sources is very high, due to the scarcity of data and low
frequency of sampling in tropical studies, especially for the African
continent. The principal objective of this work was to quantify the annual
budget of N2O emissions in an African tropical rain forest. Soil
N2O emissions were measured over 19 months in Ghana, National Park of
Ankasa, in uphill and downhill areas, for a total of 119 days of observation.
The calculated annual average emission was
2.33 ± 0.20 kg N-N2O ha−1 yr−1, taking into
account the proportion of uphill vs. downhill areas, the latter being
characterized by lower N2O emissions. N2O fluxes peaked between
June and August and were significantly correlated with soil respiration on a
daily and monthly basis. No clear correlation was found in the uphill area
between N2O fluxes and soil water content or rain, whereas in the
downhill area soil water content concurred with soil respiration in
determining N2O flux variability. The N2O source strength
calculated in this study is very close to those reported for the other two
available studies in African rain forests and to the estimated mean derived
from worldwide studies in humid tropical forests
(2.81 ± 2.02 kg N-N2O ha−1 yr−1). |
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