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| Titel |
Soil-atmosphere exchange of nitrous oxide, methane and carbon dioxide in a gradient of elevation in the coastal Brazilian Atlantic forest |
| VerfasserIn |
E. Sousa Neto, J. B. Carmo, M. Keller, S. C. Martins, L. F. Alves, S. A. Vieira, M. C. Piccolo, P. Camargo, H. T. Z. Couto, C. A. Joly, L. A. Martinelli |
| 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 ; 8, no. 3 ; Nr. 8, no. 3 (2011-03-21), S.733-742 |
| Datensatznummer |
250005574
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| Publikation (Nr.) |
 copernicus.org/bg-8-733-2011.pdf |
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| Zusammenfassung |
| Soils of tropical forests are important to the global budgets of greenhouse
gases. The Brazilian Atlantic Forest is the second largest tropical moist
forest area of South America, after the vast Amazonian domain. This study
aimed to investigate the emissions of nitrous oxide (N2O), carbon
dioxide (CO2) and methane (CH4) fluxes along an altitudinal
transect and the relation between these fluxes and other climatic, edaphic
and biological variables (temperature, fine roots, litterfall, and soil
moisture). Annual means of N2O flux were 3.9 (± 0.4), 1.0 (± 0.1), and 0.9 (± 0.2) ng N cm−2 h−1 at altitudes 100, 400,
and 1000 m, respectively. On an annual basis, soils consumed CH4 at all
altitudes with annual means of −1.0 (± 0.2), −1.8 (± 0.3), and −1.6
(± 0.1) mg m−2 d−1 at 100 m, 400 m and 1000 m, respectively.
Estimated mean annual fluxes of CO2 were 3.5, 3.6, and
3.4 μmol m−2 s−1 at altitudes 100, 400 and 1000 m, respectively. N2O
fluxes were significantly influenced by soil moisture and temperature.
Soil-atmosphere exchange of CH4 responded to changes in soil moisture.
Carbon dioxide emissions were strongly influenced by soil temperature. While
the temperature gradient observed at our sites is only an imperfect proxy
for climatic warming, our results suggest that an increase in air and soil
temperatures may result in increases in decomposition rates and gross
inorganic nitrogen fluxes that could support consequent increases in soil
N2O and CO2 emissions and soil CH4 consumption. |
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