2.3.1 Climate data
Monthly and annual climatic data (annual precipitation and MAT) were
collected from 1979 to 2017 at 65 weather stations located within our
study region. We used Kriging interpolation method to interpolate
meteorological data with a spatial resolution of 1 km×1 km and
regionalize the various variables at different scales. Further
interpolations were conducted to adjust the temperature to the
respective mean plot elevation (Piao et al., 2011). We used this
approach to calculate the mean value of the MAT and annual precipitation
from 1979 to 2017 for each plot. And then, we used linear regression
model to analysis the MAT and annual precipitation change over time (see
Fig S2).