Methane and nitrous oxide fluxes from four tundra ecotopes in Ny-Alesund of the High Arctic
During the summers of 2008 and 2009, net methane(CH4) and nitrous oxide(N2O) fluxes were investigated from 4 tundra ecotopes: normal lowland tundra(LT), bird sanctuary tundra(BT), the tundra in an abandoned coal mine(CT) and the tundra in scientific bases(ST) in Ny-Alesund of the High Arctic. Tundra...
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Veröffentlicht in: | Journal of environmental sciences (China) 2014-07, Vol.26 (7), p.1403-1410 |
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Sprache: | eng |
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Zusammenfassung: | During the summers of 2008 and 2009, net methane(CH4) and nitrous oxide(N2O) fluxes were investigated from 4 tundra ecotopes: normal lowland tundra(LT), bird sanctuary tundra(BT), the tundra in an abandoned coal mine(CT) and the tundra in scientific bases(ST) in Ny-Alesund of the High Arctic. Tundra soils in CT(184.5 ± 40.0 μg CH4/(m2·hr)) and ST(367.6 ± 92.3 μg CH4/(m2·hr)) showed high CH4 emissions due to the effects of human activities, whereas high CH4 uptake or low emission occurred in the soils of LT and BT.The lowland tundra soils(mean,-4.4-4.3 μg N2O/(m2·hr)) were weak N2 O sources and even sinks. Bird activity increased N2 O emissions from BT with the mean flux of7.9 μg N2O/(m2·hr). The mean N2 O fluxes from CT(45.4 ± 10.2 μg N2O/(m2·hr)) and ST(78.8 ± 18.5 μg N2O/(m2·hr)) were one order of magnitude higher than those from LT and BT, indicating that human activities significantly increased N2 O emissions from tundra soils. Soil total carbon and water regime were important factors affecting CH4 fluxes from tundra soils. The N2 O fluxes showed a significant positive correlation with ammonia nitrogen(NH4+-N) contents(r = 0.66, p 〈 0.001) at all the observation sites, indicating that ammonia nitrogen(NH4+-N) content acted as a strong predictor for N2 O emissions from tundra soils. The CH4 and N2O fluxes did not correspond to the temperature variations of soil at 0-15 cm depths.Overall our results implied that human activities might have greater effects on soil CH4 and N2O emissions than current climate warming in Ny-Alesund, High Arctic. |
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ISSN: | 1001-0742 1878-7320 |
DOI: | 10.1016/j.jes.2014.05.005 |