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“Recent treeline dynamics in Northern Sweden” – a landscape assessment

“Recent treeline dynamics in Northern Sweden” – a landscape assessment. Project description. Changes in treeline dynamics at Torneträsk region, northernmost Sweden (68° N) Landscape assessment High resolution study Time period 1900  present Multidisciplinary vs. Interdisciplinary

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“Recent treeline dynamics in Northern Sweden” – a landscape assessment

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  1. “Recent treeline dynamics in Northern Sweden” – a landscape assessment Rik Van Bogaert - Ghent University (Belgium) FWO

  2. Project description • Changes in treeline dynamics at Torneträsk region, northernmost Sweden (68° N) • Landscape assessment • High resolution study • Time period 1900  present • Multidisciplinary vs. Interdisciplinary • Historical sources Rik Van Bogaert - Ghent University (Belgium) FWO

  3. Study area Rik Van Bogaert - Ghent University (Belgium) FWO

  4. Major questions • ‘What is the state of Torneträsk’s treeline zone for the past 50-100 years?’ • ‘Are there significant variations in treeline dynamics according climate regime (incl. exposure), inclination, soil type, human & herbivoral disturbance history, and vegetation composition?’ If so, in what degree do they explain the deviations? Rik Van Bogaert - Ghent University (Belgium) FWO

  5. The way forward... Rik Van Bogaert - Ghent University (Belgium) FWO

  6. Approach & Methods • 1. Replication of former treeline measurements • upper forest-line reconstruction for Torneträsk after Thore Fries (1905- ’12) • Treeline transects of Jan Hoogesteger (1977) • 2. Aerial image series comparison: 1959 vs. 2000  establishment of new transects through the treeline ecotone • 3. Replication of old photographs (~1920 < > present) • 4. Dendrochronology Rik Van Bogaert - Ghent University (Belgium) FWO

  7. Polycormic birch individual at Swedish treeline Rik Van Bogaert - Ghent University (Belgium) FWO

  8. Replication of former treeline measurements Line c = construction of upper forestline (Fries, 1913) Rik Van Bogaert - Ghent University (Belgium) FWO

  9. Replication of former treeline measurements Topographical map that Fries used for his forest-line elevation measures (National Swedish Land Survey 1886-1888) Rik Van Bogaert - Ghent University (Belgium) FWO

  10. Repeating historical photographs View on Njulla’s tree-line zone (B. Mesch ~1915) Rik Van Bogaert - Ghent University (Belgium) FWO

  11. Replication of old treeline transects 2006: on the search for Hoogesteger’s treeline transect (1977)  purple line Rik Van Bogaert - Ghent University (Belgium) FWO

  12. Aerial image comparison 1959 2000 Rik Van Bogaert - Ghent University (Belgium) FWO

  13. Rectangular plot of 100m² making part of a 3-dimensional transect through Torneträsk’s treeline ecotone Establishment of new transects Rik Van Bogaert - Ghent University (Belgium) FWO

  14. Dendrochronology collecting birch cores Rik Van Bogaert - Ghent University (Belgium) FWO

  15. Invading treeline species Aspen (Populus tremula L.) Rik Van Bogaert - Ghent University (Belgium) FWO

  16. Invading treeline species Grey alder (Alnus incana (L.) Moench) – dark green spots Rik Van Bogaert - Ghent University (Belgium) FWO

  17. Disturbances Geomorphologic events: i.e. avalanches Transect through avalanche runout lob Rik Van Bogaert - Ghent University (Belgium) FWO

  18. Disturbances Insect attacks – e.g. Epirrita autumnata Left: larva of Epirrita autumnata, right: birch forest after attack Rik Van Bogaert - Ghent University (Belgium) FWO

  19. Will an answer arise to the nagging question: ‘how will this complex boundary develop?’ Rik Van Bogaert - Ghent University (Belgium) FWO

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