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AMBIO

, Volume 40, Issue 3, pp 264–273 | Cite as

Climate Warming and the Recent Treeline Shift in the European Alps: The Role of Geomorphological Factors in High-Altitude Sites

  • Giovanni Leonelli
  • Manuela Pelfini
  • Umberto Morra di Cella
  • Valentina Garavaglia
Report

Abstract

Global warming and the stronger regional temperature trends recently recorded over the European Alps have triggered several biological and physical dynamics in high-altitude environments. We defined the present treeline altitude in three valleys of a region in the western Italian Alps and reconstructed the past treeline position for the last three centuries in a nearly undisturbed site by means of a dendrochronological approach. We found that the treeline altitude in this region is mainly controlled by human impacts and geomorphological factors. The reconstruction of the altitudinal dynamics at the study site reveals that the treeline shifted upwards of 115 m over the period 1901–2000, reaching the altitude of 2505 m in 2000 and 2515 m in 2008. The recent treeline shift and the acceleration of tree colonization rates in the alpine belt can be mainly ascribed to the climatic input. However, we point out the increasing role of geomorphological factors in controlling the future treeline position and colonization patterns in high mountains.

Keywords

Climate change Treeline Geomorphology Tree rings Larix decidua European Alps 

Notes

Acknowledgments

This research was supported by the European Social Fund, the Autonomous Region of Valle d’Aosta and the Italian Ministry of Labour and Social Welfare; it was also funded by the PRIN 2008 project ‘Climate change effects on glaciers, permafrost and derived water resource. Quantification of the ongoing variations in the Italian Alps, analysis of their impacts and modelling future projections’, national coordinator Prof. C. Smiraglia. The authors wish to thank Prof. M. Maugeri and Prof. R. Böhm for providing the Aosta and the HISTALP series, respectively, and Dr. M. Cocco and Dr. D. Castagneri for their help in tree sampling.

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Copyright information

© Royal Swedish Academy of Sciences 2010

Authors and Affiliations

  • Giovanni Leonelli
    • 1
  • Manuela Pelfini
    • 1
  • Umberto Morra di Cella
    • 2
  • Valentina Garavaglia
    • 1
  1. 1.Department of Earth SciencesUniversity of MilanMilanItaly
  2. 2.ARPA Valle d’AostaSaint ChristopheItaly

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