今年春季的七场沙尘暴 ,京郊延庆县相对于北京城里来说 ,风较小 ,沙尘少 ,树没倒 ,缘由何在？答案就是 :坚持多年治沙植绿妫川。延庆县位于首都北京的西北部 ,东南北三面环山 ,西临官厅水库 ,距北京７０公里 ,是我国西北地区风沙进入北京的咽喉要道。妫河两侧属冲积平原 ,康庄 Seven sandstorms this spring, Yanqing County, Beijing relative to the city of Beijing, the wind is small, less dust, the tree did not fall, why? The answer is: adhere to many years of sand planting green Xichuan. Yanqing County is located in the northwestern part of the capital city of Beijing. It is surrounded by mountains on three sides of the southeast and north and Guanting Reservoir to the west. It is 70 kilometers away from Beijing and is the throat of Beijing’s wind and sand in northwestern China. River flanked by alluvial plains, Kang Zhuang