Research Article

Reference Evapotranspiration Changes: Sensitivities to and Contributions of Meteorological Factors in the Heihe River Basin of Northwestern China (1961–2014)

Figure 8

Trends of annual , , , and for the upper (U), middle (M), and lower (L) region and the whole basin (W). S indicates that the trend is statistically significant, and NS indicates that the trend is not significant at the 0.05 level.