Vegetation History and Archaeobotany

, Volume 23, Issue 5, pp 479–496 | Cite as

Holocene climate, fire and vegetation dynamics at the treeline in the Northwestern Swiss Alps

  • Christoph Schwörer
  • Petra Kaltenrieder
  • Lukas Glur
  • Matthias Berlinger
  • Julie Elbert
  • Stephanie Frei
  • Adrian Gilli
  • Albert Hafner
  • Flavio S. Anselmetti
  • Martin Grosjean
  • Willy Tinner
Original Article

Abstract

Treelines are expected to rise to higher elevations with climate warming; the rate and extent however are still largely unknown. Here we present the first multi-proxy palaeoecological study from the treeline in the Northwestern Swiss Alps that covers the entire Holocene. We reconstructed climate, fire and vegetation dynamics at Iffigsee, an alpine lake at 2,065 m a.s.l., by using seismic sedimentary surveys, loss on ignition, visible spectrum reflectance spectroscopy, pollen, spore, macrofossil and charcoal analyses. Afforestation with Larix decidua and tree Betula (probably B. pendula) started at ~9,800 cal. b.p., more than 1,000 years later than at similar elevations in the Central and Southern Alps, indicating cooler temperatures and/or a high seasonality. Highest biomass production and forest position of ~2,100–2,300 m a.s.l. are inferred during the Holocene Thermal Maximum from 7,000 to 5,000 cal. b.p. With the onset of pastoralism and transhumance at 6,800–6,500 cal. b.p., human impact became an important factor in the vegetation dynamics at Iffigsee. This early evidence of pastoralism is documented by the presence of grazing indicators (pollen, spores), as well as a wealth of archaeological finds at the nearby mountain pass of Schnidejoch. Human and fire impact during the Neolithic and Bronze Ages led to the establishment of pastures and facilitated the expansion of Picea abies and Alnus viridis. We expect that in mountain areas with land abandonment, the treeline will react quickly to future climate warming by shifting to higher elevations, causing drastic changes in species distribution and composition as well as severe biodiversity losses.

Keywords

Palaeoecology Treeline Human impact Vegetation history Alps Afforestation 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Christoph Schwörer
    • 1
    • 2
  • Petra Kaltenrieder
    • 1
    • 2
  • Lukas Glur
    • 3
  • Matthias Berlinger
    • 1
  • Julie Elbert
    • 2
    • 4
  • Stephanie Frei
    • 1
  • Adrian Gilli
    • 5
  • Albert Hafner
    • 2
    • 6
  • Flavio S. Anselmetti
    • 2
    • 3
    • 7
  • Martin Grosjean
    • 2
    • 4
  • Willy Tinner
    • 1
    • 2
  1. 1.Institute of Plant SciencesUniversity of BernBernSwitzerland
  2. 2.Oeschger Centre for Climate Change ResearchUniversity of BernBernSwitzerland
  3. 3.Departement of Surface Waters – SedimentologySwiss Federal Institute of Aquatic Sciences, EawagDübendorfSwitzerland
  4. 4.Institute of GeographyUniversity of BernBernSwitzerland
  5. 5.Geological InstituteETH ZurichZurichSwitzerland
  6. 6.Department of Prehistory, Institute of Archaeological SciencesUniversity of BernBernSwitzerland
  7. 7.Institute of Geological SciencesUniversity of BernBernSwitzerland

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