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Silva Fennica 1926-1997
Acta Forestalia Fennica

Articles containing the keyword 'northern Fennoscandia'

Category: Research article

article id 83, category Research article
Inari Ylläsjärvi, Håkan Berglund, Timo Kuuluvainen. (2011). Relationships between wood-inhabiting fungal species richness and habitat variables in old-growth forest stands in the Pallas-Yllästunturi National Park, northern boreal Finland. Silva Fennica vol. 45 no. 5 article id 83.
Keywords: species-area relationship; species richness; old-growth forest; indicators; northern Fennoscandia; polyporaceae; polypores
Abstract | View details | Full text in PDF | Author Info
Indicators for biodiversity are needed for efficient prioritization of forests selected for conservation. We analyzed the relationships between 86 wood-inhabiting fungal (polypore) species richness and 35 habitat variables in 81 northern boreal old-growth forest stands in Finland. Species richness and the number of red-listed species were analyzed separately using generalized linear models. Most species were infrequent in the studied landscape and no species was encountered in all stands. The species richness increased with 1) the volume of coarse woody debris (CWD), 2) the mean DBH of CWD and 3) the basal area of living trees. The number of red-listed species increased along the same gradients, but the effect of basal area was not significant. Polypore species richness was significantly lower on western slopes than on flat topography. On average, species richness was higher on northern and eastern slopes than on western and southern slopes. The results suggest that a combination of habitat variables used as indicators may be useful in selecting forest stands to be set aside for polypore species conservation.
  • Ylläsjärvi, Rovaniemi University of Applied Sciences, School of Forestry and Rural Industries, Jokiväylä 11 c, FI-96300 Rovaniemi, Finland E-mail: (email)
  • Berglund, University of Helsinki, Department of Forest Sciences, Helsinki, Finland E-mail:
  • Kuuluvainen, University of Helsinki, Department of Forest Sciences, Helsinki, Finland E-mail:
article id 468, category Research article
Antti Lännenpää, Tuomas Aakala, Heikki Kauhanen, Timo Kuuluvainen. (2008). Tree mortality agents in pristine Norway spruce forests in northern Fennoscandia. Silva Fennica vol. 42 no. 2 article id 468.
Keywords: Picea abies; northern Fennoscandia; Coniophora; mortality agent; pristine forest
Abstract | View details | Full text in PDF | Author Info
We examined tree mortality agents in pristine old Norway spruce (Picea abies (L.) Karst.) forests in northern Finland and northwestern Russia. The data was collected on nine 40 m   400 m transects. The primary mortality agents of recently dead trees were recorded and their frequencies were calculated. The pattern of tree growth prior to death was studied based on increment core samples and compared with the growth of healthy dominant trees. Of all recently dead trees, 72% could be associated with a primary mortality agent. In both study areas the most common primary mortality agent was a Coniophora (Mérat) DC. -genus fungi, which was found on average in 33% of trees sampled. The fungi Phellinus chrysoloma (Fr.) Don and Onnia leporina (Fr.) H. Jahn as mortality agents were more common in the Finnish area compared to the Russian area. Analysis on the growth patterns indicated weak differences between different pathogens’ influence on prior-to-death growth of trees, so that fungi rotting the whole tree decreased tree growth more rapidly than fungi rotting only the heart wood. The results demonstrated that in old Norway spruce forests of northern Fennoscandia the most common primary tree mortality agents were wood rotting fungi, which weaken the mechanical stability of tree stems until they fall due to snow or wind, which should be considered only as secondary mortality agents. It is evident that tree death in pristine forest typically results from a long-lasting process involving both biotic and abiotic factors.
  • Lännenpää, Department of Forest Ecology, University of Helsinki, Finland E-mail:
  • Aakala, Department of Forest Ecology, University of Helsinki, Finland E-mail: (email)
  • Kauhanen, Kolari Research Unit, Finnish Forest Research Institute, Finland E-mail:
  • Kuuluvainen, Department of Forest Ecology, University of Helsinki, Finland E-mail:

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