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在我国960万平方公里的国土上,平原面积仅占12%,而不同类型的山地、丘陵、高原面积占总面积的69%,因此坡地的改造利用关系到农业经济的发展和国土的整治。坡地改造利用的关键是防止水土流失。对不同类型的坡地应采取不同的水土保持措施,而科学地配置任何一种水土保持措施,都要涉及到坡面径流及其水力性质。在坡面上,不论是修梯田或其它林草整地工程,都能把地表径流截留拦蓄在坡面上,起到减
In China’s 9.6 million square kilometers of land, only 12% of the plain area, and different types of mountain, hills, plateau area of 69% of the total area, so the slope of the transformation and utilization related to the development of agricultural economy and land improvement. The key to rebuilding and using slopes is to prevent soil erosion. Different soil and water conservation measures should be taken for different types of slopes, and any kind of water and soil conservation measures should be scientifically allocated to involve slope runoff and its hydraulic properties. On the slope, whether it is to cultivate a terrace or other forestry and grass-planting project, the runoff can be intercepted and stopped at the slope,