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Research article - Peer-reviewed, 2011

Tree and Shrub Expansion Over the Past 34 Years at the Tree-Line Near Abisko, Sweden

Rundqvist, Sara; Hedenås, Henrik; Sandström, Anneli; Emanuelsson, Urban; Eriksson, Håkan; Jonasson, Christer; Callaghan, Terry V.


Shrubs and trees are expected to expand in the sub-Arctic due to global warming. Our study was conducted in Abisko, sub-arctic Sweden. We recorded the change in coverage of shrub and tree species over a 32- to 34-year period, in three 50 x 50 m plots; in the alpine-tree-line ecotone. The cover of shrubs and trees (<3.5 cm diameter at breast height) were estimated during 2009-2010 and compared with historical documentation from 1976 to 1977. Similarly, all tree stems (>= 3.5 cm) were noted and positions determined. There has been a substantial increase of cover of shrubs and trees, particularly dwarf birch (Betula nana), and mountain birch (Betula pubescens ssp. czerepanovii), and an establishment of aspen (Populus tremula). The other species willows (Salix spp.), juniper (Juniperus communis), and rowan (Sorbus aucuparia) revealed inconsistent changes among the plots. Although this study was unable to identify the causes for the change in shrubs and small trees, they are consistent with anticipated changes due to climate change and reduced herbivory.


Vegetation change; Tree-line; Shrubs; Sub-Arctic; Herbivory; Human impacts

Published in

AMBIO: A Journal of the Human Environment
2011, Volume: 40, number: 6, pages: 683-692
Publisher: SPRINGER

    SLU Authors

    • Emanuelsson, Urban

      • Swedish Biodiversity Centre, Swedish University of Agricultural Sciences

    UKÄ Subject classification

    Environmental Sciences related to Agriculture and Land-use

    Publication Identifiers


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