Figure captions:
Figure 1 Interannual variation in enhanced vegetation index (EVI) from 2000 to 2021. Boxes and circles represent the change in EVI before and after the establishment of the eddy correlation system, respectively.
Figure 2 Interannual variation in seasonal (a) and annual (b) mean air temperature at 4 m height and seasonal (c) and annual (d) accumulative precipitation from 2009 to 2021.
Figure 3 Interannual variation in the start of net carbon uptake period (SCUP), end of net carbon uptake period (ECUP), and duration of net carbon uptake period (DCUP) from 2009 to 2021.
Figure 4 Interannual variation in annual gross ecosystem productivity (GEP) (close circles), ecosystem respiration (Re) (close squarest) and net ecosystem productivity (NEP) (close triangles).
Figure 5 Interannual variation in seasonal gross ecosystem productivity (GEP), ecosystem respiration (Re) and net ecosystem productivity (NEP) from 2009 to 2021.
Figure 6 Relationships between carbon flux and mean annual temperature, annual precipitation and duration of net carbon uptake.
Figure 7 Relationships between (a) spring temperature, (b) time of the start of net carbon uptake period (SCUP) and spring carbon fluxes ((gross ecosystem productivity (GEP) (close circles), ecosystem respiration (Re) (close triangles), and net ecosystem productivity (NEP) (close squarest)); (c) summer and (d) autumn carbon fluxes and summer precipitation.
Figure 8 Mechanism diagram of the impact of the vegetation restoration system and climate on NEP.