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Poplar clones 546 (P. deltoides cv. ‘55/56’×P. deltoides cv. ‘Imperial’) and 107 (P. euramericana cv. ‘74/76’) were exposed to five ozone concentrations in 15 open-top chambers (OTCs). Both ozone exposure (AOT40, Accumulation Over a Threshold hourly ozone concentration of 40ppb) and flux-based (POD7, Phytotoxic Ozone Dose above an hourly flux threshold of 7nmol O3 m−2 PLA (projected leaf area) s−1...
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