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Magnusson, Helena, 2010. Epixylic lichens and bryophytes in young managed forests : substrate preferences and amounts of dead wood. Second cycle, A1E. Uppsala: SLU, Dept. of Ecology

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Abstract

Dead wood is important for many species. The amount of coarse dead wood (diameter >10 cm) is much lower in managed forest than in unmanaged forests. Stumps constitute the largest proportion of the volume of coarse dead wood in managed forests. Since stump harvest for biofuel may increase, the amount of dead wood will decrease even more, which may threaten biodiversity. The first aim of this study was to compare the amounts of fine woody debris (FWD, <10 cm in diameter) and coarse woody debris (CWD), in young managed forest stands. The second aim was to investigate if epixylic lichen and bryophyte occurrences were affected by substrate qualities. In seven stands (9-16 years old) in the province of Uppland I estimated the amounts of dead wood, and recorded substrate quality variables and occurrence of eight lichen and five bryophyte species. Number of objects and surface area were larger for FWD than CWD, while the volume was higher for CWD. Five of the 13 focal species were found, among which the occurrence probabilities of the lichens Cladonia botrytes, Xylographa parallela and Mycocalicium subtile could be analyzed statistically. C. botrytes only occurred on CWD, and there was a higher probability of occurrence on stumps than on logs. The occurrence probability of X. parallela was higher on CWD than on FWD. For M. subtile the probability of occurrence was not affected by substrate variables. Stumps are important substrates for C. botrytes, which is an argument against stump harvest. If choosing between harvesting slash (i.e. branches and tops) or stumps, this study suggests that stump harvest gives the most negative effects on occurrence probabilities in young managed forest stands of two epixylic lichens. However, more perspectives have to be included to be able to in full evaluate stump harvest.

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Main title:Epixylic lichens and bryophytes in young managed forests
Subtitle:substrate preferences and amounts of dead wood
Authors:Magnusson, Helena
Supervisor:Caruso, Alexandro and Rudolphi, Jörgen
Examiner:Redbo Torstensson, Peter
Series:Självständigt arbete/Examensarbete (SLU, Institutionen för ekologi)
Volume/Sequential designation:2010:3
Year of Publication:2010
Level and depth descriptor:Second cycle, A1E
Student's programme affiliation:NBMMP Natural Resources Programme - Biology and Soil Science 240 HEC
Department:(NL, NJ) > Dept. of Ecology
(S) > Dept. of Ecology
Keywords:dead wood, lichens , bryophytes, fine woody debris, stump harvest, coarse woody debris, species occurrence
URN:NBN:urn:nbn:se:slu:epsilon-8-859
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-8-859
Subjects:Nature conservation and land resources
Forestry - General aspects
Language:English
Deposited On:01 Nov 2010 15:39
Metadata Last Modified:20 Apr 2012 14:15

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