A crop coefficient (k c) was also estimated for calculating the ET c, and average value of k c during the growing season was 0.81 (ranging from 0.45 to 1.16). Total ET c and ET 0 values during the growing season (from May to September) were 441 and 666 mm, respectively, which accounted for 75.73% of annual cumulative ET c and 72.34% of annual cumulative ET 0, respectively. Moreover, ET 0 began to increase in March and reached the peak value in August and then declined in September, however, ET c began to increase from April and reached the peak value in July, and then declined in August. Results indicated that ET c estimated by the EC System was 583 mm, lower than ET 0 (923 mm) estimated by the FAO Penman-Monteith model in 2014. Meanwhile, actual ET (ET c) was also investigated by the eddy covariance (EC) system. In this study, the FAO (Food and Agriculture Organization) Penman-Monteith model was used to estimate the magnitude and temporal dynamics of reference evapotranspiration (ET 0) in 2014 in subalpine meadows of the Qilian Mountains, Northwest China. As a main component in water balance, evapotranspiration (ET) is of great importance for water saving, especially in arid and semi-arid areas.
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