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Effets d'une augmentation de dioxyde de carbone et d'ozone sur les échanges gazeux et la composition minérale des tissus foliaires de Quercus rubra (L), Picea abies (L.) Karst. et Fagus sylvatica (L.) cultivés en chambres à ciel ouvert ; interactions avec des déficits hydriques

Abstract : This thesis presents ecophysiological measurements that were performed on different tree species to assess the impact of global pollutant changes on forests. The work has concentrated on the effects of an increase in tropospheric ozone (on two Picea abies clones and on Fagus sylvatica) and on a doubling of C02 (on Picea abies and Quercus rubra). Growth, foliage gas exchange and the concentrations of nutrients at both the whole leaf and at the tissue level were studied. Furthermore the effects of combining each pollutant with drought were assessed. The growth of Picea abies at ambient + 50 ppb ozone was significantly reduced. The effect of ozone on gas exchange and nutrient levels of needles of Picea abies varied between clones. The response of beech was different to that of Norway spruce. Drought accentuated the effects of ozone on one-year-old needles of the Istebna clone, but it served to reduce the impact of ozone on beech leaves. Increasing the C02 concentration led to stomatal opening and larger net assimilation rates in red oak, but as the drought developed both oak and spruce had greater water use efficiencies in CO2 enhanced air. 700 ppm C02 had a tendency to decrease the total foliage concentration of nutrients, but this phenomenon was not consistent between different foliage tissues.
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Didier Le Thiec. Effets d'une augmentation de dioxyde de carbone et d'ozone sur les échanges gazeux et la composition minérale des tissus foliaires de Quercus rubra (L), Picea abies (L.) Karst. et Fagus sylvatica (L.) cultivés en chambres à ciel ouvert ; interactions avec des déficits hydriques. Biologie végétale. Université Henri Poincaré - Nancy 1, 1994. Français. ⟨NNT : 1994NAN10334⟩. ⟨tel-01748610⟩

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