*2.2. Data Sources*

The EVI data came from the MODIS C6 MOD13Q1 dataset published by the National Aeronautics and Space Administration (NASA) of the United States. Compared with C5 data, C6 data further solves the problem of data attenuation and distortion due to the aging of satellite sensors, resulting in a significant increase in data quality. IMAR involves seven scenes of h27v04, h26v05, h26v04, h26v03, h25v05, h25v04, and h25v03 with a spatial resolution of 250 m and a time resolution of 16d.

The meteorological data were selected from the monthly mean air temperature, monthly mean relative humidity, and monthly cumulative precipitation data from 110 meteorological stations in IMAR and its neighboring areas from February to September during year 2000–2015. The data were provided by China Meteorological Science Data Sharing Service Website (http://data.cma.gov.cn).

The vegetation type data were taken from the 1:1,000,000 national vegetation type dataset published by the Data Center of Chinese Academy of Resources and Environmental Sciences (http://www.resdc.cn).

Digital Elevation Model (DEM) data were taken from Advanced Spaceborne Theemal Emission and Reflection Radiometer (ASTER) global digital elevation model (ASTER GDEM) V2 digital elevation data from geospatial data cloud platform (http://www.gscloud.cn) with a spatial resolution of 30 m.
