1引言在我国西部于旱、半干旱气候区，地处青藏、黄土、蒙新高原，远离海洋、沙漠戈壁广布，植被稀疏，光照充足，气候干燥，农业大都为绿洲灌溉农业，与我国东部沿海湿润、半湿润地区相比较，在气候、土壤、植被观及农业类型等均有很大差异。在同纬度太阳辐射条件下，由于地形 1 Introduction In the western part of China, in the arid and semi-arid climatic zones, it is located in Qinghai-Tibet, Loess Plateau, Mengxin Plateau and far away from the ocean. The desert is gobi with extensive vegetation, sparse vegetation, abundant sunshine and dry climate. Most agriculture is oasis irrigated agriculture, Coastal wet, sub-humid areas compared to climate, soil, vegetation and agricultural types are very different. In the same latitude under the conditions of solar radiation due to the terrain