Woody species with higher hydraulic efficiency or lower photosynthetic capacity discriminate more against C at the global scale.

Leaf carbon isotope composition (δC) provides an integrative record on the carbon and water balance of plants over long periods. Photosynthetic ability and hydraulic traits which are highly associated with stomatal behavior could affect leaf δC. Association between photosynthetic ability and leaf δC has been examined, however, how hydraulic traits influence leaf δC has not been fully understood.