AMBIO

, Volume 40, Issue 3, pp 264–273

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

DOI: 10.1007/s13280-010-0096-2

Cite this article as:
Leonelli, G., Pelfini, M., Morra di Cella, U. et al. AMBIO (2011) 40: 264. doi:10.1007/s13280-010-0096-2

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 changeTreelineGeomorphologyTree ringsLarix deciduaEuropean Alps

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