(Table 3) Isotope data from nine sites on a north-south transect from the Con...

calc. % C4: Estimates are based on 5% C4 plants in the Congo area and a d13C value of C4 plants of -21 per mil.calc. % C4：该估算基于刚果地区占比为5%的C4植物（C4 plants），以及C4植物的δ13C值为-21‰。