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Traumatic resin ducts in Larix decidua stems impacted by debris flows

  • Bollschweiler, Michelle Laboratory of Dendrogeomorphology, Department of Geosciences, University of Fribourg, Switzerland
  • Stoffel, Markus Laboratory of Dendrogeomorphology, Department of Geosciences, University of Fribourg, Switzerland -
  • Schneuwly, Dominique M. Laboratory of Dendrogeomorphology, Department of Geosciences, University of Fribourg, Switzerland
    03.12.2007
Published in:
  • Tree Physiology. - 2008, vol. 28, no. 2, p. 255-263
English Following mechanical injury, stems of many conifers produce tangential rows of traumatic resin ducts (TRDs), the distribution of which has been used to date geomorphic events. However, little is known about how far TRD formation extends tangentially and axially from the point of injury or what the time course of TRD appearance is. We analyzed 28 injuries in eight Larix decidua Mill. tree stems resulting from debris flows in October 2000 and November 2004. Injuries occurred outside the period of cambial activity, and TRD formation occurred in the first layers of the growth ring formed in the year following that of injury. The axial extent of TRD formation averaged 74 cm and was greater above the injury than below it. At the height of the wound center, TRDs extended horizontally to a mean of 18% of the stem circumference excluding that portion where the cambium had been destroyed. In subsequent growth rings, TRDs, if present, were confined mainly to the height of the center of injury. Both the vertical and horizontal extent of TRD formation was related to the injury size. Within growth rings, the position of TRD formation changed with increasing distance from the wound progressing from early earlywood to later portions of the growth ring.
Faculty
Faculté des sciences et de médecine
Department
Département de Géosciences
Language
  • English
Classification
Biological sciences
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/300663
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