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This study examined how competition and drought affect the water use efficiency (WUE) response to rising CO2 in Abies pinsapo trees in Spain. The researchers measured basal area increment (BAI) and carbon isotope discrimination (d13C) in tree rings from dominant trees experiencing different competition levels at high- and low-elevation sites. Both sites showed long-term WUE increases, but the low site saw a slower increase and BAI decline due to local warming and drought. Trees facing more competition had l

Author

Frontiers

Language

EN