Fig. 13

Relation between annual net ecosystem exchange of CO₂ (NEE) with mean annual air temperature (T_air, left) and precipitation (right) from March 2015 to February 2016. The values of previous studies are derived from Valentini et al. [62], Curtis et al. [63], Kato and Tang [64], Hirata et al. [65], and Takagi et al. [66]. The CP and SF sites are cropland and subtropical forest, respectively