Spatio-Temporal Variations of Reference Crop Evapotranspiration and Factors Affecting It in Shanxi Province
Spatio-temporal variation of reference evaporation (ET0) in Shanxi Province was calculated using the Penman-Monteith model based on daily climatic data collected from 35 meteorological stations in Shanxi and its proximal regions from 1957 to 2014,using a simple linear regression with an inverse distance-weighting method.We also analyzed the factors that affect the variation of ET0 using a stepwise regression.The results showed that:①The change of annual average ET0 fluctuated but with a declining trend.②The multi-year average of ET0 varied spatially with two peaks,two sub-peaks and two troughs;the spatial distribution of multi-yearaverage of ET0 was similar to the distribution of ET0 in autumn,but differed considerably from that in spring,winter and summer.③In each meteorological station,the factors that significantly affected the annual average ET0 was in order of wind speed,temperature,relative humidity,sunshine hours or precipitation,while for the average over the province,the factors that affected the ET0 significantly was in the order of wind speed,temperature,relative humidity,sunshine hours and precipitation.Also,the impact of altitude on ET0 was more significant than latitude.
国家科技期刊平台
NSTL
万方数据
维普
