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Impact of ozone on the growth of birch (Betula pendula) saplings

Journal article
Authors Per Erik Karlsson
Johan Uddling
Lena Skärby
Göran Wallin
Gun Selldén
Published in Environmental Pollution
Volume 124
Issue 3
Pages 485-495
ISSN 0269-7491
Publication year 2003
Published at Botanical Institute
Pages 485-495
Language en
Keywords ozone, aot40, relative growth rate, betula pendula, carbon allocation, ambient levels, norway spruce, whole-plant, roth, sensitivity, responses, exposure, stress, clones, vegetation
Subject categories Botany


Saplings of one half-sib family of birch, Betula pendula, were exposed to three levels of ozone in open-top chambers (OTCs) during two growing seasons 1997-1998. The ozone treatments were non-filtered air (NF, accumulated daylight AOT40 over the two growing seasons of 3.0 mul l(-1) h), non-filtered air with extra ozone (NF +, accumulated daylight AOT40 of 27.3 mul l(-1) h) and nonfiltered air with additional extra ozone (NF++, accumulated daylight AOT40 of 120 mul l(-1) h), The birch saplings, including the roots, were harvested after the first and second growing seasons. After the first growing season, the NF++ treatment reduced the total wood biomass by 22%, relative to the NF treatment. There was no further reduction of the total wood biomass in the NF++ treatment after the second growing season. The root biomass was reduced by 30% after the first growing season. The shoot/root ratio, as well as the proportional biomass of leaves, were increased by ozone during both years. The ozone impact on the relative growth rate was estimated to -2% per 10 mul l(-1) h daylight AOT40 per growing season. (C) 2003 Elsevier Science Ltd. All rights reserved.

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