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一、水土保持区划的依据 水土保持区划的依据和原则,是由它的目的和任务所决定的。我们综合近几年有关搞好区划工作的意见,提出以下依据。 1.根据土壤侵蚀类型(风力侵蚀和水力侵蚀)和主要气候特征作为一级划区的主要指标; 2.以地貌类型(如山地、高原、丘陵、平原等)和地面组成物质(如黄土、红土、裸岩、沙漠、戈壁等)作为二级划区的主要指标; 3.以降水特性和植被类型作为三级划区的主要指标; 4.以土壤侵蚀的地域差异性和土地利用
First, the basis for the division of soil and water conservation Soil and water conservation zoning basis and principles, is determined by its purpose and mandate. Based on the opinions on doing a good job in zoning in recent years, we put forward the following basis. 1. According to the type of soil erosion (wind erosion and water erosion) and the main climatic characteristics as a primary indicator of the first-level zoning; 2. Based on the types of landforms (such as mountain, plateau, hills, plains, etc.) and ground composition (such as loess, Red soil, bare rock, desert, Gobi, etc.) as the main indicators of the second-level zoning; 3. The main indicators of the third-level zoning based on the characteristics of precipitation and vegetation; 4. Based on the regional differences of soil erosion and land use