Fig. 3
The BVOCs emission (106 g C·year− 1) (a) and proportion of each component (%) (b) from dominant forest species in the Jing-Jin-Ji area (BP: Betula platyphylla; QV: Quercus variabilis; UP: Ulmus pumila; PoT: Populus tomentosa; RP: Robinia pseudoacacia; PO: Platycladus orientalis; PiT: Pinus tabuliformis; SB: Salix babylonica; LG: Larix gmelinii)