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| Titel |
Effects of N and P fertilization on the greenhouse gas exchange in two northern peatlands with contrasting N deposition rates |
| VerfasserIn |
M. Lund, T. R. Christensen, M. Mastepanov, A. Lindroth, L. Ström |
| 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 ; 6, no. 10 ; Nr. 6, no. 10 (2009-10-09), S.2135-2144 |
| Datensatznummer |
250004035
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| Publikation (Nr.) |
 copernicus.org/bg-6-2135-2009.pdf |
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| Zusammenfassung |
| Peatlands are important ecosystems in the context of biospheric
feedback to climate change, due to the large storage of organic
C in peatland soils. Nitrogen deposition and increased
nutrient availability in soils following climate warming may cause
changes in these ecosystems affecting greenhouse gas exchange. We
have conducted an N and P fertilization experiment in
two Swedish bogs subjected to high and low background N deposition,
and measured the exchange of CO2, CH4 and
N2O using the closed chamber technique. During the second
year of fertilization, both gross primary production and ecosystem
respiration were significantly increased by N addition in the
northernmost site where background N deposition is low, while
gross primary production was stimulated by P addition in the
southern high N deposition site. In addition, a short-term
response in respiration was seen following fertilization in both
sites, probably associated with rapid growth of nutrient-limited
soil microorganisms. No treatment effect was seen on the CH4
exchange, while N2O emission peaks were detected in N
fertilized plots indicating the importance of taking N2O
into consideration under increased N availability. In a
longer term, increased nutrient availability will cause changes in
plant composition, which will further act to regulate the peatland
greenhouse gas exchange. |
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