Study on Compound Techniques of Near Nature Soil and Water Conservation in Loess Hilly-gully Region

The authors did experiments and theory studies on the environment protection and rehabilitation aimed at solving problems such as terrace edge collapse, road soil and water loss, and problems in shelter woods land such as simple species and weak function ability, and artificial grass land refarming, economic woods with badly soil and water loss, etc in loess hillygully region. Based on theory studies authors take those exist problems into main research work and as the breakthrough point and they divide land use into two main types as "economic development land" and "environment conservation land" and then conducted the land management by the near nature scheme. Though 6 years experimental and demonstration studies the near nature soil and water conservation technique system was designed,including"croporchardgrass terrace compound ecoeconomy techsystem with terrace edge near the cease angle", "compound protection trees system that need to fit the local environment by selecting tree species", compound road protection system with rational trees (fruit trees)grasswater combination and together with water cellor harvesting to prevent road erosion. The study recommends the rational near nature soil and water conservation technique system for loss hillygully region that can be used as a technique model to prevent soil and water loess and then build beautiful environment in the region.