Lichen communities on Populus tremula are affected by the density of Picea abies

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http://hdl.handle.net/10138/332664

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Nirhamo, A, Pykälä, J, Halme, P, Komonen, A. Lichen communities on Populus tremula are affected by the density of Picea abies. Appl Veg Sci. 2021; 24:e12584. https://doi.org/10.1111/avsc.12584

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Title: Lichen communities on Populus tremula are affected by the density of Picea abies
Author: Nirhamo, Aleksi; Pykälä, Juha; Halme, Panu; Komonen, Atte
Publisher: Wiley
Date: 2021
Language: en
Belongs to series: Applied Vegetation Science 24: 2
ISSN: 1402-2001
URI: http://hdl.handle.net/10138/332664
Abstract: Questions: Aspen (Populus tremula) is declining in the old-growth forests of boreal Fennoscandia. This threatens the numerous taxa that are dependent on old aspens, including many epiphytic lichens. Potential methods to aid epiphytic lichens on aspen are centered around treatments which affect the density of Norway spruce (Picea abies). In this study, we investigated how epiphytic lichen communities on aspen are affected by the variation of spruce density in the immediate vicinity of the focal aspen. Location: Southern boreal forests in Finland. Methods: We recorded the occurrence of lichens from 120 aspens in 12 semi-natural forest sites. We used spruce basal area as the measure for spruce density. The selected aspens represented a gradient in spruce basal area in the vicinity of the aspen from 0 to 36 m2/ha. We also measured other tree- and stand-level variables that are known to influence lichen occurrence. Results: Lichen communities on aspen were affected by spruce density, stand age and bark pH. Both lichen species richness and the richness of red-listed species were highest at an intermediate spruce density, and both increased with stand age. Lichen species richness was higher when bark pH was lower. Additionally, community composition was influenced the most by spruce density, followed by bark pH. Conclusions: Our study highlights the detrimental effects of high spruce density on lichen diversity on aspens. This is caused by high spruce density resulting in low light availability. Lichen diversity on aspens was highest when spruce density was intermediate. Spruce thinning in aspen-rich old-growth forests can be helpful in ensuring the long-term persistence of old-growth lichens on aspen in protected forests.
Subject: biodiversity
boreal forests
community ecology
cyanolichens
epiphytic lichens
European aspen
Norway spruce
old-growth forests
protected areas
red-listed species
succession
lichen
lichen communities
Populus tremula
density
Picea abies
boreal zone
occurence
Southern Finland
Finland
protected areas
old growth forests
interaction
ecology
mycology
Subject (ysa): boreaalinen vyöhyke
esiintyminen
Etelä-Suomi
suojelualueet
jäkälät
vanhat metsät
Picea abies
metsäkuusi
haapa
tiheys
Populus tremula
vuorovaikutus
ekologia
sienitiede
biodiversiteetti


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