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Range Expansion of Thermophilic Aspen (Populus tremula L.) in the Swedish Subarctic
Responsible organisation
2010 (English)In: Arctic, Antarctic and Alpine research, ISSN 1523-0430, E-ISSN 1938-4246, Vol. 42, no 3, 362-375 p.Article in journal (Refereed) Published
Abstract [en]

Abstract In subarctic Sweden, recent decadal colonization and expansion of aspen (Populus tremula L.) were recorded. Over the past 100 years, aspen became c. 16 times more abundant, mainly as a result of increased sexual regeneration. Moreover, aspen now reach tree-size (>2 m) at the alpine treeline, an ecotone that has been dominated by mountain birch (Betula pubescens ssp. czerepanovii) for at least the past 4000 years. We found that sexual regeneration in aspen probably occurred seven times or more within the last century. Whereas sexual regeneration occurred during moist years following a year with an exceptionally high June?July temperature, asexual regeneration was favored by warm and dry summers. Disturbance to the birch forest by cyclic moth population outbreaks was critical in aspen establishment in the subalpine area. At the treeline, aspen colonization was less determined by these moth outbreaks, and was mainly restricted by summer temperature. If summer warming persists, aspen spread may continue in subarctic Sweden, particularly at the treeline. However, changing disturbance regimes, future herbivore population dynamics and the responses of aspen's competitors birch and pine to a changing climate may result in different outcomes.

Place, publisher, year, edition, pages
Institute of Arctic and Alpine Research (INSTAAR), University of Colorado , 2010. Vol. 42, no 3, 362-375 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:polar:diva-3543DOI: 10.1657/1938-4246-42.3.362OAI: oai:DiVA.org:polar-3543DiVA: diva2:1095338
Available from: 2017-05-12 Created: 2017-05-12 Last updated: 2017-05-12

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Publisher's full texthttp://dx.doi.org/10.1657/1938-4246-42.3.362
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Arctic, Antarctic and Alpine research
Natural Sciences

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CiteExportLink to record
Permanent link

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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
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  • text
  • asciidoc
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