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  • 1. Berninger, Frank
    Gianelle, Damiano
    Bahn, Michael
    Wohlfahrt, Georg
    Sutton, Mark
    Garcia-Pausas, Jordi
    Gimeno, Cristina
    Sanz, Maria J.
    Dore, Sabina
    Rogiers, Nele
    Furger, Markus
    Eugster, Werner
    Balzarolo, Manuela
    Sebastià, M. Teresa
    Tenhunen, John
    Staszewski, Tomasz
    Cernusca, Alexander
    Management and site effects on carbon balances of European mountain meadows and rangelands2015In: Boreal environment research, ISSN 1239-6095, E-ISSN 1797-2469, Vol. 20, no 6, p. 748-760Article in journal (Refereed)
    Abstract [en]

    We studied carbon balances and carbon stocks of mountain rangelands and meadows in a network of 8 eddy covariance sites and 14 sites with biomass data in Europe. Net ecosystem exchange of pastures and extensively managed semi-natural rangelands were usually close to zero, while meadows fixed carbon, with the exception of one meadow that was established on a drained peatland. When we accounted for off-site losses and inputs also the carbon budget of meadows approached zero. Soil carbon stocks in these ecosystems were high, comparable to those of forest ecosystems, while carbon stocks in plant biomass were smaller. Since soil carbon stocks of abandoned mountain grasslands are as high as in managed ecosystems, it is likely that the widespread abandonment of mountain rangelands used currently as pastures will not lead to an immediate carbon sink in those ecosystems.

  • 2. Hellen, Heidi
    et al.
    Leck, Caroline
    Paatero, Jussi
    Virkkula, Aki
    Hakola, Hannele
    Summer concentrations of NMHCs in ambient air of the Arctic and Antarctic2012In: Boreal environment research, ISSN 1239-6095, E-ISSN 1797-2469, Vol. 17, no 5, p. 385-397Article in journal (Refereed)
    Abstract [en]

    Summer concentrations of C-2-C-6 non-methane hydrocarbons (NMHCs) were measured in Antarctica and in the Arctic in 2008. The results show that NMHC concentrations are on average five times higher in the Arctic than in Antarctica. In Antarctica, there were few concentration peaks, but during most of the remaining time concentrations were below or close to the detection limits. Over the Arctic pack ice area north of 80 degrees, concentrations of most of the measured NMHCs were always above the detection limits. No differences based on air-mass origin were detected in Antarctica, but samples collected over the central Arctic Ocean showed higher concentrations in air masses being advected from the Kara Sea and the western-central Arctic Ocean. The relatively higher NMHC-to-ethyne molar ratios calculated for samples collected over the central Arctic Ocean suggest additional alkane sources in the region.

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