I wonder how the albedo has changed, and evaporation of water there.
That was my thought too Is it possible the trees can change the climate in the region? Can trees dampen regional water flux, seed clouds down range?
https://www.msn.com/en-us/weather/climate-change/china-accid...
(if that doesn't come up, search terms to find it were "news china rainfall forest tree planting change")