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Fungi and wind strongly influence the temporal availability of logs in an old-growth spruce forest
Swedish University of Agricultural Sciences, Umeå.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
Responsible organisation
2007 (English)In: Ecological Applications, ISSN 1051-0761, E-ISSN 1939-5582, Vol. 17, no 2, 482-490 p.Article in journal (Refereed) Published
Abstract [en]

Coarse woody debris (CWD) is a key habitat for many species in forest ecosystems. To ensure the long-term survival of such species, forest management regimes must include measures that promote dead wood dynamics similar to those of natural forests. Thus, information on CWD dynamics under natural conditions is required, including data pertaining to the underlying agents of disturbance. This study examines modes of mortality, decay rates, and temporal patterns in the availability of Picea abies logs in a Swedish old-growth forest affected by internal, small-scale disturbance. All 684 logs in a 6.6-ha plot were mapped and classified into one of six decay classes. Logs in the early stages of decay were examined for the presence of heart-rot fungi. Six years later all logs were re-inventoried, including newly formed logs. Matrix models based on the transition rates between decay classes showed that it took about 60 years for 90% of the logs to decay beyond class 6 (a deformed trunk with soft wood). Large logs (≥26 cm) decayed 40% more slowly than small logs (≤25 cm). The initial volume of logs was 37.6 m3/ha but increased to 44.8 m 3/ha after six years. In addition, there was a large shift in the decay-class distribution. The volume of logs in early and late decay classes increased by 71% and 45%, respectively, while the volume of logs in the intermediate decay classes decreased by 32%. The fluctuations appear to result from pulses in mortality, driven by a combination of strong winds and the heart-rot fungus, Phellinus chrysoloma, which was present in more than 30% of all logs at an early stage of decay. These results show that large temporal fluctuations in dead wood also occur in the absence of large-scale disturbance, and that heart-rot fungi are important factors driving the overall dynamics of dead wood. Since many wood-inhabiting species are naturally rare and have very specific substrate demands, such temporal variability in dead wood availability may have effects on biodiversity and should be taken into account when designing small, protected forest areas.

Place, publisher, year, edition, pages
2007. Vol. 17, no 2, 482-490 p.
Keyword [en]
Boreal, Coarse woody debris, Decay rate, Disturbance agents, Forest management, Heart-rot fungi, Norway spruce, Phellinus chrysoloma, Stage matrix, Sweden, Temporal pattern, Tree mortality
Keyword [sv]
skog, biologisk mångfald
National Category
Biological Sciences Ecology Agricultural Sciences
Identifiers
URN: urn:nbn:se:miun:diva-3854DOI: 10.1890/06-0852ISI: 000245744200016PubMedID: 17489254Scopus ID: 2-s2.0-34247246346Local ID: 4124OAI: oai:DiVA.org:miun-3854DiVA: diva2:28886
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VR-Biology

Available from: 2008-09-30 Created: 2009-11-02 Last updated: 2016-10-05Bibliographically approved

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Edman, MattiasJönsson, MariJonsson, Bengt Gunnar
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CiteExportLink to record
Permanent link

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Citation style
  • apa
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  • vancouver
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More styles
Language
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  • Other locale
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