Nutritional effects triggered by the extreme summer 2003 in the free air ozone fumigation experiment at the Kranzberger Forst |
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Authors: | A Göttlein H Rodenkirchen K H Häberle R Matyssek |
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Institution: | 1.Fachgebiet Waldern?hrung u. Wasserhaushalt,TUM Weihenstephan,Freising,Germany;2.Lehrstuhl f. ?kophysiologie der Pflanzen,TUM Weihenstephan,Freising,Germany |
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Abstract: | Since the year 2000 mature beech and spruce trees were treated in a field experiment with double ambient ozone concentrations.
Elevated ozone had no influence on average single leaf biomass and there were also no ozone effects on leaf nutrient concentrations
in climatic normal years. However, the extraordinary dry summer 2003 triggered significant differences between the fumigated
and control trees. For beech in the year after the drought event the control trees surprisingly had significantly lower foliar
levels of K and P than in former years, whereas the ozone exposed trees showed no significant nutritional effects. There are
indications, that the trees exposed to double ambient ozone were already adapted to higher ozone values, whereas the control
trees experienced extraordinary high ambient ozone concentrations in the dry and sunny summer 2003. For spruce in autumn 2003
and 2004 ozone treated trees had significantly higher foliar levels of K in current year needles than control trees, an effect
which cannot be thoroughly interpreted yet on the basis of the dataset available.
This article belongs to the special issue „Growth and defence of Norway spruce and European beech in pure and mixed stands“. |
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Keywords: | Elevated ozone Fagus sylvatica Leaf biomass Nutrient concentrations Picea abies |
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