Frost cracks and their effect on the stability of birch stands in the Krusne Hory Mts.
2006
Kula, E.(Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Lesnicka a Drevarska Fakulta) E-mail:[email protected] | Buchta, I.(Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Lesnicka a Drevarska Fakulta) | Stransky, P.(Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Lesnicka a Drevarska Fakulta)
Frost cracks which originated in birch due to bending during a long-term icing in winter 1995/1996 became the place of entrance for the attack of birch stems by Piptoporus betulinus. This was one of the causes of birch stand disintegration in the Krusne hory Mts, Czech Republic. The number of frost cracks increased with the transect profile altitude 700-850 m. One crack on the birch stem predominated (73%), a higher number of frost cracks occurred at altitudes above 800 m. In stands younger than 20 years, frost crack damage was higher (34-47%) than in older stands (14%). Frost cracks occurred in the lower part of stems with the highest bending stress.
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