espèce (1) chêne (1) feuille (1) isotope (1) gaz (1) carbone (1) Composition (1) Carbon content (1) Area (1) Environmental sciences (1) Area (1) Species (1) Oak (1) Mass (1) Lignin (1) Hollies (1) Gas (1) Exchange (1) English oak (1) Earth (Planet) (1) Discrimination (1) Carbon (1) Water efficiency (1) messe (1)