... Original articleGrowth, gas exchange and carbon isotope discrimination in young Prunus avium trees growing with or without individual lateral sheltersC ... determined in situ just prior to the gas exchange measure-ments by means of a portable area meter (Licor3000, Li-Cor, Lincoln, NE, USA). Carbon isotopic composition Carbon ... canopy) originating from soilrespiration (Vogel, 1978 ; Medina and Min-chin, 1980 ; Francey and Farquhar, 1982 ;Medina et al, 1986 ; Gebauer and Schulze,1991). In the present...