International Journal of Biometeorology

, Volume 45, Issue 4, pp 203–207

Phytophenological trends in Switzerland

  • C. Defila
  • B. Clot
Original Article

DOI: 10.1007/s004840100101

Cite this article as:
Defila, C. & Clot, B. Int J Biometeorol (2001) 45: 203. doi:10.1007/s004840100101


Nation-wide phenological observations have been made in Switzerland since 1951. In addition to these observation programmes, there are two very long phenological series in Switzerland: leaf bud burst of horse-chestnut trees has been observed in Geneva since 1808 and full flowering of cherry trees in Liestal since 1894. In addition to the presentation of these two long phenological series, trends for 896 phenological time series have been calculated with national data from 1951 to 1998. The earlier bud burst of horse-chestnut trees in Geneva can be attributed mainly to the city effect (warmth island). This phenomenon was not observed with the cherry tree flowering in Liestal. A clear trend towards earlier appearance dates in spring and a weak tendency towards later appearance dates in autumn could be shown with data from the national observation network. It must be noted that different phenophases and plant species react differently to various environmental influences.

Keywords Global climate change Phytophenology Switzerland Time series Trends 

Copyright information

© International Society of Biometeorology 2001

Authors and Affiliations

  • C. Defila
    • 1
  • B. Clot
    • 1
  1. 1.MeteoSchweiz, Krähbühlstrasse 58, CH - 8044 Zürich, Switzerland e-mail: Fax: +411-256-92-78CH

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