142M471B3J 1 7440-44-0 1 Brassica napus 1 CO2 efflux 1 Carbon 1 Carbon Dioxide 1 Journal Article 1 plus ... Populus deltoides 1 Research Support, N.I.H., Extramural 1 Research Support, Non-U.S. Gov't 1 Research Support, U.S. Gov't, Non-P.H.S. 1 carbon cycle 1 internally transported CO2 1 leaf respiration 1 stem [CO2*] 1 terrestrial carbon sink 1 tunable diode laser absorbance spectroscopy 1 xylem-transported CO2 1 moins ...