It has been known that effect of natural emissions of VHC from different sources on imbalance of atrno spheric VHC is great.

• 天然产生的挥发性卤代烃(VHC),对大气中VHC的源汇平衡有显著影响。不同生态系统中VHC的天然生成机制存在很大差异,有许多天然过程还不为人们所了解。