Belowground effects of enhanced tropospheric ozone and drought in a beech/spruce forest (Fagus sylvatica L./Picea abies [L.] Karst) |
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| Authors: | Petia S. Nikolova Christian P. Andersen Rainer Matyssek |
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| Affiliation: | a Ecophysiology of Plants, Technische Universität München, Weihenstephan Center of Life and Food Sciences, Am Hochanger 13, 85354 Freising, Germany
b Western Ecology Division, National Health and Environmental Effects Research Laboratory, United States Environmental Protection Agency, 200 SW 35th St., Corvallis, OR 97333, USA |
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| Abstract: | The effects of experimentally elevated O3 on soil respiration rates, standing fine-root biomass, fine-root production and δ13C signature of newly produced fine roots were investigated in an adult European beech/Norway spruce forest in Germany during two subsequent years with contrasting rainfall patterns. During humid 2002, soil respiration rate was enhanced under elevated O3 under beech and spruce, and was related to O3-stimulated fine-root production only in beech. During dry 2003, the stimulating effect of O3 on soil respiration rate vanished under spruce, which was correlated with decreased fine-root production in spruce under drought, irrespective of the O3 regime. δ13C signature of newly formed fine-roots was consistent with the differing gs of beech and spruce, and indicated stomatal limitation by O3 in beech and by drought in spruce. Our study showed that drought can override the stimulating O3 effects on fine-root dynamics and soil respiration in mature beech and spruce forests. |
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| Keywords: | Fagus sylvatica Picea abies Soil respiration Fine-root production δ13C Ozone fumigation Drought |
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