Vegetative bud-burst variability of European elms

  • A. Santini Istituto per la Protezione delle Piante-CNR
  • L. Ghelardini University of Firenze (italy)
  • M. Falusi University of Firenze (italy)
  • J. Bohnens Forsteinrichtung. Information. Versuchswesen (FIV)
  • M. Buron Universidad Politécnica de Madrid, Madrid
  • E. Collin Cemagref
  • A. Solla Universidad de Extremadura
  • A. Vanden Broeck Inst. voor Bosbouw en Wildbeheer
Keywords: Ulmus minor, Ulmus glabra, Ulmus laevis, thermal time, chilling


The bud-burst dates of clones of Ulmus minor, Ulmus glabra, and Ulmus laevis were recorded in the field during the spring of 2000, 2001 and 2002 at six locations in five European countries. Meteorological data were obtained from stations close to the plots. Thermal time to bud-burst (T) and chilling (C) were calculated. A relationship on the form T = a + b erC was fitted for each species. In the three species, winter rest release seems to be controlled by two opposite quantitative effects of the temperature, which interrelate according to an inverse exponential relation. Besides, the bud-burst date was found to be stable between years characterised by different winter thermal trends. These three Elm species have small chilling requirements. U. minor has chilling requirements lower than those of the other two species, in agreement with the more southern distribution.


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How to Cite
Santini, A., Ghelardini, L., Falusi, M., Bohnens, J., Buron, M., Collin, E., Solla, A., & Vanden Broeck, A. (2004). Vegetative bud-burst variability of European elms. Forest Systems, 13(1), 37-45.
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