Genetic variation for carbon isotope composition in Juglans regia L.: relationships with growth, phenology and climate of origin

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Table I

Geographic origin (provenance region), habitat characteristics and leaf δ¹³C of 22 Juglans regia families, and details of the study site in Constantí.

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Tmax_an= mean annual maximum temperature; Tmin_an= mean annual minimum temperature; P_an= annual precipitation; PET_an= annual potential evapotranspiration; P_an/ PET_an= ratio of annual precipitation to annual potential evapotranspiration; VPD_an= annual mean of daytime vapour pressure deficit.