Fig. 13

Relation between annual net ecosystem exchange of CO2 (NEE) with mean annual air temperature (Tair, 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