Environmental pollution, 2010, Vol.158, pp.1071-1078
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. Drought has the capacity to override the stimulating ozone effect on soil respiration in adult European beech/Norway spruce forest. ; In the special issue: Facing the Future: Evidence from Joint AspenFACE, SoyFACE and SFB 607 Meeting / edited by Kevin Percy, John King and Rainer Matyssek. Paper presented at meeting held April 2-4, 2008, Rhinelander, Wisconsin. Includes references ; p. 1071-1078.
Soil Water Content ; Air Temperature ; Root Growth ; Fagus Sylvatica ; Forest Trees ; Elevated Atmospheric Gases ; Air Pollution ; Drought ; Soil Temperature ; Soil Respiration ; Ozone ; Humidity ; Climatic Factors ; Picea Abies
AGRIS (Food and Agriculture Organization of the United Nations)
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