The results showed that the annual average WUE of forests was higher than that of grasslands, and the WUE for other vegetation types exhibited a decreasing trend, except for farmland ( p < 0.05) and desert grasslands ( p > 0.05).
A spatiotemporal variation analysis based on these breakpoints revealed that, between 1982 and 1997, 20.28% of areas had a highly significant increase in WUESeason.
The trend in the annual WUE in some broadleaf forest areas in the middle and northeast of the Mongolian Plateau reversed from the original decreasing trend to an increasing trend.