Impact of climate change on irrigation water requirement of wheat growth – A case study of the Beijing-Tianjin-Hebei region in China

This study analyzes the irrigation water requirement of wheat in Beijing-Tianjin-Hebei region under changes meteorological factors conditions, using growth period data, and data from 197 stations, 1960 to 2019. The results show that: (1) annual average precipitation, wind speed, relative humidity a downward variation trend, while temperature shows an upward trend. Moreover, radiation exhibit negative spatial correlation. (2) Wheat gradually decreases north south east west. However, eastern increasing western decreasing (3) Meteorological are negatively correlated with requirement, potential evapotranspiration, effective humidity, significantly positively sunshine hours, temperature, speed. overall has highest correlation evapotranspiration. yearly variations regional dependent on such as radiation.