dataThe study areas include the major wheat production regions inChina. According to wheat cultivation zones in China (Jin, 1961;Zhao, 2010), the agricultural meteorological stations were groupedinto eight zones, i.e., Zone I, Zone II, Zone III, Zone IV, Zone V, Zone VI,Zone VII and Zone VIII (Fig. 1). These zones were created to reflectdifferences in biophysical conditions such as soil and climate andcropping system