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Growth of Norway spruce (Picea abies) in relation to different ozone exposure indices: a synthesis

Journal article
Authors L. Skarby
Susanne Ottosson
Per Erik Karlsson
Göran Wallin
Gun Selldén
E. L. Medin
Håkan Pleijel
Published in Atmospheric Environment
Volume 38
Issue 15
Pages 2225-2236
ISSN 1352-2310
Publication year 2004
Published at Botanical Institute, Plant Physiology
Department of Environmental Science and Conservation, Applied Environmental Science
Pages 2225-2236
Language en
Links 10.1016/j.atmosenv.2003...
Keywords biomass, relative growth, AOT, critical level, ozone, Picea abies, Norway spruce
Subject categories Botany, Terrestrial ecology, Plant production


In the Goteborg Ozone-Spruce Project (GOSP), two independent open-top chamber experiments were conducted during four growing seasons, using one clone of Norway spruce (Picea abies). The experiments tested the impact of ozone, alone and in combination with low phosphorus supply and in combination with drought stress, respectively, on biomass accumulation. In this paper, the results from both experiments were combined for the first time in order to analyse the relationship between relative biomass accumulation and different exposure indices (accumulated exposure over a threshold (AOT) with different cut-off concentrations, and the sum of ozone concentrations above 60 nl l(-1), referred to as SUM06). In addition, a pooled analysis was made on several European studies of Norway spruce as a first effort to synthesize independent data and test the relative growth in relation to the AOT40 index. Significant negative relationships between the relative biomass of the GOSP-clone and the different indices were obtained. AOT20 and AOT30 resulted in the highest correlations. Based on the regression model, ozone is predicted to reduce the biomass of the GOSP-clone by 1% at the critical level for forest trees in Europe, a seasonal AOT40 of 10 mul l(-1) h. A significant negative relationship between relative growth and AOT40 was obtained also with the European data set. At the present ozone critical level, the model predicted a 6% reduction in growth for the most sensitive Norway spruce trees in this data set. (C) 2004 Elsevier Ltd. All rights reserved.

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