| In order to explore the changing characteristics and its influence factors for the reference evapotranspiration (ET0) in Gansu Province, using the observed data during 1951—2013 from 29 meteorological stations in Guansu Province, adopted the FAO-Penman-Monteith formula to calculate the ET0 in different regions, also analyzed the temporal-spatial differential feature of ET0 depended on the linear trend equation, cloud mode, Path analysis and sensitivity analysis of indicators methods. The results showed that: The ET0 in Guansu Province was appeared an increasing tendency by the inclination rate of 2.11 mm·10a-1. Except Hexi region was appeared a decrease tendency by the inclination rate of 0.71 mm·10a-1. Other three regions were total appeared an increasing tendency. In general the spatial distribution of ET0 was presented the northwest area large than the southeast area, the Hexi region was the most discrete and instability, the Longdong region was the best homogeneity and stability. The main influence factors for ET0 were possessed the spatial variability. In Hexi and Longnan region was the average temperature, and in Longzhong and Longdong region was the average relative humidity and sunshine hours. However, the variety of ET0 was the result by many factors, the mean wind speed was the other main influence factor in Hexi and Longdong regions, and the mean relative humidity was in Longzhong region, and the sunshine hours was in Longnan region. |