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  • 1.
    Cornelissen, Johannes H C
    et al.
    Vrije Universiteit.
    Van Bodegom, Peter M
    Vrije Universiteit.
    Aerts, Rien
    Vrije Universiteit.
    Callaghan, Terry V
    University of Sheffield.
    Van Logtestijn, Richard S.P.
    Vrije Universiteit.
    Alatalo, Juha
    VINNOVA.
    Chapin, Stuart F.
    University of Alaska.
    Gerdol, Renato G
    Università degli Studi di Ferrara Dipartimento delle Risorse Naturali e Cultural.
    Gudmundsson, Jon
    Agricultural University of Iceland.
    Gwynn-Jones, Dylan
    University of Wales.
    Hartley, Anne E
    Florida International University.
    Hik, David S
    University of Alberta.
    Hofgaard, Annika
    Norwegian Institute for Nature Research.
    Jónsdóttir, Ingibjörg S.
    Agricultural University of Iceland.
    Karlsson, Staffan
    Vetenskapsrådet.
    Klein, Julia A
    Colorado State University.
    Laundre, Jim
    Marine Biological Labratory.
    Magnusson, Borgthor
    Icelandic Institute of Natural History.
    Michelsen, Anders
    University of Copenhagen.
    Molau, Ulf
    Göteborgs Universitet.
    Onipchenko, Vladimir G.
    Moscow State University.
    Quested, Helen M.
    Stockholms Universitet.
    Sandvik, Sylvi M
    Agder University College.
    Schmidt, Inger K.
    Royal Veterinary and Agricultural University Denmark.
    Shaver, Gus R.
    Marine Biological Labratory.
    Solheim, Bjørn S
    University of Tromsø.
    Soudzilovskaia, Nadejda A
    Vrije Universiteit, Moscow State University.
    Stenström, Anna
    Länsstyrelsen Västra Götaland.
    Tolvanen, Anne
    Finnish Forest Research Institute.
    Totland, Ørjan T
    Norwegian University of Life Sciences.
    Wada, Naoya W
    University of Toyama.
    Welker, Jeffrey M
    University of Alaska Anchorage.
    Zhao, Xinquan
    Chinese Academy of Sciences.
    Brancaleoni, Lisa
    Brancaleoni, Laura
    De Beus, Miranda A.H
    Cooper, Elisabeth J.
    Dalen, Linda
    Harte, John
    Hobbie, Sarah E
    Hoefsloot, Gerlof
    Jägerbrand, Annika K
    Göteborg University.
    Jonasson, Sven
    Lee, John A
    Lindblad, Karin
    Melillo, Jerry M
    Neill, Christopher
    Press, Malcolm C
    Rozema, Jelte
    Zielke, Matthias
    Global negative vegetation feedback to climate warming responses of leaf litter decomposition rates in cold biomes2007In: Ecology Letters, ISSN 1461-023X, E-ISSN 1461-0248, Vol. 10, no 7, p. 619-627Article in journal (Refereed)
    Abstract [en]

    Whether climate change will turn cold biomes from large long-term carbon sinks into sources is hotly debated because of the great potential for ecosystem-mediated feedbacks to global climate. Critical are the direction, magnitude and generality of climate responses of plant litter decomposition. Here, we present the first quantitative analysis of the major climate-change-related drivers of litter decomposition rates in cold northern biomes worldwide.

    Leaf litters collected from the predominant species in 33 global change manipulation experiments in circum-arctic-alpine ecosystems were incubated simultaneously in two contrasting arctic life zones. We demonstrate that longer-term, large-scale changes to leaf litter decomposition will be driven primarily by both direct warming effects and concomitant shifts in plant growth form composition, with a much smaller role for changes in litter quality within species. Specifically, the ongoing warming-induced expansion of shrubs with recalcitrant leaf litter across cold biomes would constitute a negative feedback to global warming. Depending on the strength of other (previously reported) positive feedbacks of shrub expansion on soil carbon turnover, this may partly counteract direct warming enhancement of litter decomposition.

  • 2.
    Jägerbrand, Annika K
    et al.
    Göteborgs Universitet.
    Lindblad, Karin E M
    Göteborgs Universitet.
    Björk, Robert G
    Göteborgs Universitet.
    Alatalo, Juha M
    Vinnova.
    Molau, Ulf
    Göteborgs Universitet.
    Bryophyte and lichen diversity under simulated environmental change compared with observed variation in unmanipulated alpine tundra2006In: Biodiversity and Conservation, ISSN 0960-3115, E-ISSN 1572-9710, Vol. 15, no 14, p. 4453-4475Article in journal (Refereed)
    Abstract [en]

    Effects of simulated environmental change on bryophyte and lichen species richness and diversity in alpine tundra were investigated in a 5-year experiment at Latnjajaure, northern Sweden. The experiment had a factorial design including fertilisation and temperature enhancement in one meadow and one heath plant community. Responses in species richness, biodiversity, and species composition of bryophytes and lichens to experimental treatments were compared to the observed variation in six naturally occurring plant communities. The combination of fertilisation and enhanced temperature resulted in a species impoverishment, for bryophytes in the bryophyte-dominated community, and for lichens in the lichen-dominated communities, but the species composition stayed within the observed natural variation. During the course of the study, no species new to the investigated mid-alpine landscape were recorded, but that scenario is realistic within a decade when comparing with the processes seen in vascular plants.

  • 3.
    Jägerbrand, Annika K
    et al.
    Göteborgs Universitet.
    Molau, Ulf
    Göteborgs Universitet.
    Alatalo, Juha M
    Göteborgs Universitet.
    Responses of bryophytes to simulated environmental change at Latnjajaure, northern Sweden2003In: Journal of Bryology, ISSN 0373-6687, E-ISSN 1743-2820, Vol. 25, no 3, p. 163-168Article in journal (Refereed)
    Abstract [en]

    We simulated a predicted environmental change in a subarctic-alpine plant community to study short-term growth in Hylocomium splendens, and three-year effects in abundance changes of the five most common bryophytes at Latnjajaure, northern Sweden. The experiment had a factorial design with increased temperature and nutrients, alone and in combination. Moss growth was measured during the 1995 growing season, and we measured species abundance before and after three years of environmental perturbation. The combined treatments of fertilizer and temperature enhancement caused a decreased growth in length and dry weight in H. splendens. There was a significant decrease in abundance of Rhytidium rugosum in the combined temperature and fertilizer treatment. The other four common bryophyte species (Aulacomnium turgidum, Dicranum groenlandicum, Hylocomium splendens, and Ptilidium ciliare) showed weaker, but not significant trends in the same direction. As the bryophytes are an important component of arctic and subarctic vegetation, we expect that they will play a key role in the impact of anticipated Global Change on the ecosystems.

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