Accurate assessment of reference crop evapotranspiration (ET0) in Southwest China is of great significance for crop water consumption analysis, crop productivity potential assessment and regional water resources management. This paper applies the meteorological data in the Southwest of China for nearly 56 years, the ET0 in Southwest China is calculated by FAO-56 Penman-Monteith model. The characteristics and trends of ET0 and associated meteorological factors in the Southwest of China for nearly 56 years were analyzed by Mann-Kendall detection, change trend analysis and contribution rate based on the sensitivity coefficient. The results show that the values of ET0 in spring, summer, autumn and winter in the Southwest of China in the past 56 years are 314.71mm, 345.78mm, 219.13mm and 169.51mm respectively; The climatic tendency was 0.850mm/(10a), -2.841mm/(10a), 0.571mm/(10a) and 1.125mm/(10a), in which the spring and autumn ET0 showed no significant trend, and the ET0 showed a very significant downward trend in summer (P<0.01), and a significant upward trend in winter (P<0.01). The relative humidity, sunshine duration and wind speed showed a downward trend in the four seasons, and the temperature showed an upward trend, in which the relative humidity showed a very significant downward trend (P<0.01), and the minimum temperature showed a very significant upward trend (P<0.01). In spring, relative humidity contributed the most to ET0, which was 5.23%; in summer, sunshine duration contributed the most to ET0, which was -7.49%; in autumn, the maximum temperature contributed the most to ET0, which was 3.94%; The minimum temperature in winter contributed the most to ET0, which was 6.69%, followed by the average temperature of 6.57%. Therefore, in the past 56 years, the main reasons for the rise of ET0 in spring, autumn and winter in the Southwest of China are lower relative humidity, higher maximum temperature, higher minimum temperature and higher average temperature, respectively; The main reason for the decline of ET0 in summer is the reduction of sunshine duration.
Key words
Southwest China /
reference crop evapotranspiration /
season /
meteorological factors /
contribution rate
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