1 / 19

“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

tyrell
Télécharger la présentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related