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调查的缘起:银川市位于黄河上游宁夏平原中部,东以黄河和明长城为界,与陶乐县和内蒙古鄂托克前旗毗邻;西依贺兰山,与内蒙古阿拉善盟为邻;南接吴忠市;北连平罗县。地域范围在北纬37°29′~38°53′,东经105°49′~106°53′。银川市地形分为山地和平原两大部分,西部、南部较高,北部、东部较低,略呈西南—东北方向倾斜,平均海拔在1010~1150米之间。银川属中温带大陆性气候,年平均气温8.5℃,日温差12℃~15℃,年平均日照时数2800~3000小时,是全国太阳辐射和日照时
The origin of the survey: Yinchuan City is located in the upper reaches of the Yellow River in the central Ningxia Plain, east of the Yellow River and the Great Wall as a boundary, and Tao Le County and Inner Mongolia Etuokeqianqi adjacent; West Helan Mountain, Inner Mongolia and Alxa League neighbors; City; north even Pingluo County. The geographical range is 37 ° 29’-38 ° 53’N and 105 ° 49’-106 ° 53’E. The terrain of Yinchuan is divided into two major parts, mountainous and plains. The western part and the southern part are higher, while the northern part and the eastern part are lower, with a slight slope from southwest to northeast. The average elevation is between 1010 and 1150 meters. Yinchuan is a temperate continental climate, the annual average temperature of 8.5 ℃, the daily temperature difference of 12 ℃ ~ 15 ℃, the average annual sunshine hours 2800 ~ 3000 hours, is the national solar radiation and sunshine hours