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- Engelmark, Ola, et al.
(författare)
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Chapter 5. Coniferous forests.
- 1999
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Ingår i: Swedish plant geography.. - Uppsala : Svenska Växtgeografiska Sällskapet. - 9172100842 ; , s. 55-74
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Bokkapitel (refereegranskat)
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- HILMO, Olga, et al.
(författare)
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Do different logging strategies influence the abundance of epiphytic chlorolichens?
- 2005
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Ingår i: The Lichenologist. - : Cambridge University Press (CUP). - 0024-2829 .- 1096-1135. ; 37:6, s. 543-553
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Tidskriftsartikel (refereegranskat)abstract
- The effects of two logging strategies and edge effects on cover and abundance of the epiphytic chlorolichens Cavernularia hultenii, Platismatia glauca and P. norvegica were studied in an experimentally logged boreal spruce forest. Whether lichen size distribution within the three species was affected by logging regimes was also tested. One hundred and ten branches were sampled at random within: (1) fine-grained clearcuts consisting of 23 cutblocks 0·25 ha each; (2) coarse-grained clearcuts consisting of 3 clearcuts 2·25 ha each; and (3) a control area.Of the three species studied, C. hultenii was the most vulnerable to logging, with an abundance much lower in logged areas than in the control area. By contrast, P. glauca was equally abundant in the fine-grained area and in the control area, but significantly less abundant in the coarse-grained area where it seems to have been adversely affected by a pronounced edge effect. No such edge effect, however, was noted in the fine-grained area. Juvenile thalli of C. hultenii and P. glauca were less frequent in the coarse-grained area than in the fine-grained and control areas, suggesting that the juvenile stage might be more sensitive to logging than mature thalli. These results indicate that creation of large clearcuts (2·25 ha) may not be in accordance with the goal of maintaining population size in either C. hultenii or P. glauca. However, P. glauca does not seem to be negatively influenced by a fine-grained logging pattern. No effect of logging strategy or distance from the forest edge was observed on P. norvegica. It follows from the above that any management plans aimed at maintaining population size should be based on an understanding of ecology and life history gleaned from the area in question.
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- HILMO, Olga, et al.
(författare)
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Richness of epiphytic lichens in differently agedPicea abiesplantations situated in the oceanic region of Central Norway
- 2009
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Ingår i: The Lichenologist. - : Cambridge University Press (CUP). - 0024-2829 .- 1096-1135. ; 41:1, s. 97-108
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Tidskriftsartikel (refereegranskat)abstract
- This study aims to investigate patterns of species richness and abundance in relation to stand age in 71Picea abiesplantations, aged between 9 and 85 years, situated in the oceanic region of Central Norway. The study has shown that plantations within the oceanic spruce forests can support a relatively high number of epiphytic lichen species. Some of the oldest plantations hosted several old-forest associated species, e.g.Hypogymnia vittata, Lobaria pulmonaria, Pseudocyphellaria crocataandRamalina thrausta. The number of species was influenced significantly by stand age and increased rapidly in stands <20 years old. Stands >30 years old showed no clear increase in species number, except for a high number of species in the two oldest stands. The colonization pattern could be characterized as an additional entrance of species, rather than by a replacement sequence. The probability of occurrence increased steeply at young stand ages (<20 years) forBryoriaspp.,Cavernularia hultenii, Platismatia glauca, Parmelia sulcataandUsneaspp. A lower rate of colonization was characteristic forAlectoria sarmentosa, Parmelia saxatilisandPlatismatia norvegica. The cover of foliose lichens on the branches showed an almost unimodal response to stand age. The cover of lichens was highest on branches in middle-aged plantations. The reason for the lower lichen cover in late successional stages, compared to middle-aged stands, could be due to reduced light in the lower canopy of mature plantations. Increased rotation cycle, creation of gaps and short distance to sources of propagules are factors suggested to promote species richness and abundance in forest plantations.
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