Variation in the degree of coupling between δ13C of phloem sap and ecosystem respiration in two mature Nothofagus forests. - Barbour,M..M..; Hunt,J..H..; Dungan,R..J..; Thurnbull,M..H..; Brailsford,G..W..; Farquhar,G..D..; Whitehead,D.. (New Phytologist, 2005)