Carbon isotope discrimination and oxygen isotope composition in clones of the F1 hybrid between slash pine and Caribbean pine in relation to tree growth, water-use efficiency and foliar nutrient concentration. - Xu,Z..H..; Saffigna,P..G..; Farquhar,G..D..; Simpson,J..A..; Haines,R..J..; Walker,S..; Osborne,D..O..; Guinto,D.. (Tree Physiology, 2000)