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Nagel, Thomas A; Dejan Firm; Dusan Rozenbergar; Milan Kobal
European journal of forest research, 06/2016, Letnik: 135, Številka: 3Journal Article
Ice storms are important natural disturbances in temperate forests, yet have received little attention outside North America. Following an extreme ice storm in Slovenia, we examined patterns of ice damage within and among temperate forest sites and quantified differences in susceptibility to damage with respect to tree species and size across a gradient of storm intensity and site conditions. Based on a damage survey of 60 plots distributed across six unmanaged forest sites, ordinal logistic regression was used to examine patterns of ice damage as a function of storm intensity, species, tree size, and slope steepness. Our findings indicate that a complex interaction among these drivers gave rise to substantial variation in damage type and severity among species, plots, and stands. Fagus sylvatica, the most dominant species, was one of the most susceptible species to severe ice damage, while conifers (Abies alba and Picea abies) were least susceptible. Crown damage was the most common damage type at low storm intensity, while uprooting increased at higher intensity, particularly for large trees on steep slopes. Differences in species susceptibility to ice damage, combined with variation in storm intensity and site conditions, gave rise to heterogeneous damage patterns that have the potential to alter successional pathways. Based on an analysis of historical records, moderate-to-severe ice storms recur relatively frequently in the region, suggesting that they play a more important role in forest dynamics than previously thought.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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