The system of building technology and quota of anti erosion road in hill gully areas of Loess Plateau in yan'an

In the loess plateau hills gully area of North Shaanxi, the ecological environment is fraqile and soil erosion is serious. In environmental fraiqile belt, the side hill productive road reacts on pricking up soil erosion much. However, it belongs to substandard road, and people don't think much of it. But it is every important for the productive transportation and economy intercourse of the area. So its construction and maintenance have important significance. Through investigating the actuality of the erosion of side hill productive road and utilizing experiences of anti erosion road building accumulated, the erosion actuality, modes and influencing factors are summarized and the design of anti erosion measures through biology and engineering measures is expounded.