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1 January 2014 The Cryptogamic Epiphytes of Ash (Fraxinus excelsior L.) in an Ancient Pasture-Woodland: Relationships with Some Environmental Variables of Relevance to Woodland Epiphyte Management
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Abstract

One hundred and fifteen species of epiphytes were recorded from 75 ash trees in an ancient pasture-woodland along with nine environmental variables. Significant positive correlations were obtained between species richness and three of these: girth, canopy width and exposure. Total epiphyte cover also correlated positively with girth. Overall, microlichen cover>bryophyte>macrolichen cover. The largest trees possessed the largest number of ‘old forest’ taxa but no well-defined associations were observed. Proximity of trees to open water also influenced the occurrence of some species. Bark analysis from a subsample of trees showed that calcium was positively correlated to girth and total phosphorus negatively correlated, demonstrating the complexity of tree-epiphyte relationships. The study confirms the importance of ash as a phorophyte for a wide range of cryptogamic epiphytes and emphasises the need for conservation measures in the wider context of woodland management, with the provision of open glades on different scales permitting a broad range of exposure and sheltered habitats plus a sustainable age-structure for the tree population to help stabilise woodland diversity.

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Allan Pentecost "The Cryptogamic Epiphytes of Ash (Fraxinus excelsior L.) in an Ancient Pasture-Woodland: Relationships with Some Environmental Variables of Relevance to Woodland Epiphyte Management," Cryptogamie, Bryologie 35(1), 19-36, (1 January 2014). https://doi.org/10.7872/cryb.v35.iss1.2014.19
Published: 1 January 2014
JOURNAL ARTICLE
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