一、坚持生态优先的原则大同市位于山西省最北部,地处黄土高原东北边缘,毛乌素沙漠东部,植被稀少,沙土流失严重。全市80％土地的土壤中,细沙和极细沙的含量达77％—85％。春秋冬常刮的西伯利亚强季风,经大同地区把这些细沙和极细沙卷向高空,吹向直线距离不到300公里的京津地区,甚至更远的地方。大同境内的洋河和桑干河,是永定河上游,河水冲刷 First, adhere to the principle of ecological priority Datong is located in the northernmost part of Shanxi Province, is located in the northeastern Loess Plateau, the eastern part of the Mu Us desert, vegetation is scarce, serious loss of sand. 80% of the city’s soil, fine sand and very fine sand content of 77% -85%. Spring and winter often shattered Siberia strong monsoon, the Datong area to the fine sand and fine sand volume to high altitude, less than 300 kilometers straight to the Beijing-Tianjin region, even further away. The Yanghe River and Sanggan River in Datong are the upper reaches of Yongding River and the rivers are washed away