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Predicting tree regeneration in Picea abies snag stands

Kupferschmid, Andrea ; Brang, Peter ; Schönenberger, Walter ; Bugmann, Harald

In: European Journal of Forest Research, 2006, vol. 125, no. 2, p. 163-179

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    Titel
    • Predicting tree regeneration in Picea abies snag stands
    Autor
    • Kupferschmid, Andrea. Forest Ecology, Department of Environmental Sciences, Swiss Federal Institute of Technology ETH, Universitätstrasse 16, CH-8092, Zürich, Switzerland
    • Brang, Peter. Swiss Federal Research Institute WSL, Zürcherstrasse 111, CH-8903, Birmensdorf, Switzerland
    • Schönenberger, Walter. Swiss Federal Research Institute WSL, Zürcherstrasse 111, CH-8903, Birmensdorf, Switzerland
    • Bugmann, Harald. Forest Ecology, Department of Environmental Sciences, Swiss Federal Institute of Technology ETH, Universitätstrasse 16, CH-8092, Zürich, Switzerland
    Dokumententyp
    • Postprint
    Sprache
    • Englisch
    Veröffentlicht in
    • European Journal of Forest Research, 2006, vol. 125, no. 2, p. 163-179. Springer-Verlag
    Andere elektronische Ausgabe
    OAI-PMH-ID
    • oai:doc.rero.ch:314337
    Summary
    A bark beetle (Ips typographus) infestation caused the death of almost all Norway spruce (Picea abies) trees in a mountain forest in the Swiss Alps. We developed a tree regeneration model, ‘RegSnag' (=REGeneration in a SNAG stand), to project the future amount and height of tree regeneration in these snag stands. The model combines a height-class structured tree module with a microsite-based module of snag decay and ground-vegetation succession. Microsite-specific rates of germination, mortality and height growth were modelled for four tree species (Picea abies, Sorbus aucuparia, Acer pseudoplatanus and Betula pendula) in eight height classes (from seedlings to saplings 5m tall) and on 26 microsite types (e.g. moss, grass). Model tests with independent field data from 8years after the Picea die-back demonstrated that microsites had a considerable effect on the development of tree regeneration on both the montane and the subalpine level. With microsite-specific parameters, the height and frequency of Picea in each microsite could be simulated more accurately than without considering microsite effects (e.g. bias of 8 vs. 119 saplings ha−1 on the montane level). Results of simulations 40years into the future suggest that about 330-930 Picea saplings per ha out of those that germinated in 1994 and 1996 will reach a height of 5m within 30-35years after Picea die-back. This is due to differences in seed inflow and browsing intensities. Picea and not Betula or Sorbus trees will replace the current herbaceous vegetation in these snag stands