Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

    We have a manual that explains all the features 

Record number 407495
Title Is bark pH more important than tree species in determining the composition of nitrophytic or acidophytic lichen floras?
Author(s) Spier, L.; Dobben, H.F. van; Dort, K.W. van
Source Environmental Pollution 158 (2010)12. - ISSN 0269-7491 - p. 3607 - 3611.
Department(s) CL - Ecological Models and Monitoring
Publication type Refereed Article in a scientific journal
Publication year 2010
Keyword(s) epiphytic lichens - air-pollution - ammonia - netherlands - communities - nh3
Abstract To study the pH preference of epiphytic lichens, the bark pH of Fraxinus, Tilia, Quercus and Ulmus trees in an urban environment was measured using a flat surface electrode. The total number of trees was 253. A survey was made of the lichens in a 40 x 40 cm quadrat surrounding the pH measurement point. Our data analysis using multivariate and univariate statistical techniques indicates that the tree species is the most important factor influencing lichen colonisation, and that bark pH alone is of less importance. We hypothesize that the changed pollution climate, with strong decreases in both sulphur dioxide and ammonia concentrations over the past two decades and a concomitant general increase in bark pH, has made epiphytes less sensitive to pH.
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