Photosynthetic characteristics in canopies of Quercus rubra,Quercus prinus and Acer rubrum differ in response to soil water availability. - Turnbull,M..H..; Whitehead,D..; Tissue,D..T..; Schuster,W..S..; Brown,K..J..; Engel,V..C..; Griffin,K..L.. (Oecologia, 2002)