4.2 Article

Forest management and forest state in southern Sweden before and after the impact of storm Gudrun in the winter of 2005

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SCANDINAVIAN JOURNAL OF FOREST RESEARCH
卷 29, 期 5, 页码 466-472

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TAYLOR & FRANCIS AS
DOI: 10.1080/02827581.2014.927528

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wind damage; silviculture; risk perception; adaptive management

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About three times the annual cut in southern Sweden (Gotaland) was damaged by the storm Gudrun in January 2005, i.e. almost as much as the normal annual cut for all of Sweden. To establish any differences in forest management and state before and after the storm, measures such as growing stock volume, age-class distribution, and species composition were analyzed within the damaged area. As a reference the situation before and after the storm within the area in Gotaland not damaged by the storm was also analyzed. For all analyses, sample plots from the Swedish National Forest Inventory were used. Results based on mean values for the years 2000-2004/2005-2009 showed that the total growing stock for the damaged area decreased by approximately 30 million m(3) after the storm. This was mainly caused by a decrease in Norway spruce (Picea abies (L.) H. Karst). Annual growth for pine, spruce, and deciduous trees decreased by 1.8 million m(3) in the damaged area. This mainly included stands already thinned and not, as expected, in the stands ready for final felling. Also, the proportional area within each of the age classes 21-40, 41-60, and 61-80 years decreased. The storm led to an increased area in immediate need of precommercial thinning. No changes in choice of species when regenerating could be observed. Furthermore, only marginal adaptation by forest owners to future risk of wind throw could be detected.

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