Effects of elevated atmospheric CO2, prolonged summer drought and temperature increase on N2O and CH4 fluxes in a temperate heathland
| Autor: | Anders Priemé, Claus Beier, Kristian Rost Albert, Leon van der Linden, Klaus Steenberg Larsen, Mette Sustmann Carter, Martin Andersson, Per Ambus |
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| Rok vydání: | 2011 |
| Předmět: |
Carbon dioxide in Earth's atmosphere
Ecology Soil Science Climate change Environment and climate Nitrous oxide Miljø og klima Microbiology Methane chemistry.chemical_compound chemistry Environmental chemistry Greenhouse gas Carbon dioxide SDG 13 - Climate Action Temperate climate Terrestrial ecosystem SDG 15 - Life on Land |
| Zdroj: | Carter, M S, Ambus, P, Albert, K R, Larsen, K S, Andersson, M, Priemé, A, van der Linden, L G & Beier, C 2011, ' Effects of elevated atmospheric CO2, prolonged summer drought and temperature increase on N2O and CH4 fluxes in a temperate heathland ', Soil Biology & Biochemistry, vol. 43, no. 8, pp. 1660-1670 . https://doi.org/10.1016/j.soilbio.2011.04.003 |
| ISSN: | 0038-0717 |
| Popis: | In temperate regions, climate change is predicted to increase annual mean temperature and intensify the duration and frequency of summer droughts, which together with elevated atmospheric carbon dioxide (CO 2 ) concentrations, may affect the exchange of nitrous oxide (N 2 O) and methane (CH 4 ) between terrestrial ecosystems and the atmosphere. We report results from the CLIMAITE experiment, where the effects of these three climate change parameters were investigated solely and in all combinations in a temperate heathland. Field measurements of N 2 O and CH 4 fluxes took place 1–2 years after the climate change manipulations were initiated. The soil was generally a net sink for atmospheric CH 4 . Elevated temperature (T) increased the CH 4 uptake by on average 10 μg C m −2 h −1 , corresponding to a rise in the uptake rate of about 20%. However, during winter elevated CO 2 (CO 2 ) reduced the CH 4 uptake, which outweighed the positive effect of warming when analyzed across the study period. Emissions of N 2 O were generally low ( −2 h −1 ). As single experimental factors, elevated CO 2 , temperature and summer drought (D) had no major effect on the N 2 O fluxes, but the combination of CO 2 and warming (TCO 2 ) stimulated N 2 O emission, whereas the N 2 O emission ceased when CO 2 was combined with drought (DCO 2 ). We suggest that these N 2 O responses are related to increased rhizodeposition under elevated CO 2 combined with increased and reduced nitrogen turnover rates caused by warming and drought, respectively. The N 2 O flux in the multifactor treatment TDCO 2 was not different from the ambient control treatment. Overall, our study suggests that in the future, CH 4 uptake may increase slightly, while N 2 O emission will remain unchanged in temperate ecosystems on well-aerated soils. However, we propose that continued exposure to altered climate could potentially change the greenhouse gas flux pattern in the investigated heathland. |
| Databáze: | OpenAIRE |
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