【摘要】 [目的]划定县级以上水土流失重点防治区,指导水土保持措施的科学制定和提高水土流失防治成效。[方法]在参加国家水土流失重点防治区复核划分工作和完成陕西省水土流失重点防治区划分工作的基础上,通过调查及分析研究,提出了土壤侵蚀强度、林草覆盖度和水土流失治理度等定量指标和江河源头、引水水源、基本农田等保护区的定性指标。[结果]利用GIS和RS技术,以乡镇行政区划为基本单元,按照定量指标,解译遥感影像数据,生成了陕西省水土流失重点防治区划分成果图。利用定性指标,按照相对集中连片,突出重点,适当概化的原则,对划分成果进行了归类修正。以地貌类型为主线,并参照水土保持功能,对水土流失重点防治区进行了分类和命名。[结论]陕西省划分为6个水土流失重点预防区和6个水土流失重点治理区共计12个大片区,是编制《陕西省水土保持规划》、规范生产建设项目中水土保持监督工作的重要依据,也为市县级水土流失重点防治区的划分提供参考。更多还原

【Abstract】 [Objective]To designate key control zones for soil and water loss at or above the county level,and to guide the scientific development of soil and water conservation measures and to improve the effectiveness of soil erosion control.[Methods]On the basis of dividing national and the key prevention regions of soil and water loss in Shaanxi Province,forest coverage,soil erosion intensity and soil erosion control degree were used as quantitative indexes.Headstream,water source and protective zone of basic farmland were used as qualitative indexes.[Results]Using GIS and RS technology,by explaining the remote sensing translation using town as a basic unit,through the combination of qualitative and quantitative methods,the research generated a division graph of key prevention regions of soil and water loss in Shaanxi Province.It was further modified using the qualitative indexes upon the rules of"fragment connected to area,key region outstood,and generalized appropriately.The classification and nomenclature of key prevention regions of soil and water loss focused on geomorphic type,and reference function of soil and water conservation.[Conclusion]This article divided Shaanxi Province into 6 soil and water loss prophylaxis areas and 6 soil and water loss control areas,which could provide a basis for the soil and water conservation planning of Shaanxi Province,being prepared and for standardizing soil and water conservation supervision work in production and constructionprojects,and also a reference for cities and counties division of soil and water loss prevention and control areas.更多还原