Fig. 8.2 Long-term temporal variation in pH, SO 4
2À deposition, NO 3
À deposition, and the
deposition ratio of NO 3
À
/SO 4
2À (equivalence ratio) of precipitation over China (Wang and Wang
1996; Larssen et al. 2004; Duan et al. 2016; Yu et al. 2017a, c; Itahashi et al. 2018). (Note the data
from Yu et al. (2017c) is the throughfall rather than precipitation)
158
Q. Yu and L. Duan