长江上游退耕还林战略举措的关键技术之一是要模清该区土壤性状和退化问题 ,进而采取行之有效的土壤退化防治措施。尽快恢复生态 ,保护长江安全。以占该区面积最大的紫色土退化为例 ,提出了该区土壤退化特征、类型和发生现状。指出该区环境的脆弱性和人为干扰是土壤退化根本成因。建议 :( 1 )建立保护区全面封禁管护 ( 2 )构建网格生物篱保持水土增厚土层 ( 3)加强土壤碳氮物质循环强化培肥 ( 4)分带治土造林建立垄沟种植培肥体系等 ,以达到土壤肥力重建 ,取得退耕还林成效 One of the key technologies for the strategic move of returning land for farming to forestry in the upper reaches of the Yangtze River is to clarify the problem of soil properties and degradation in the area and to take effective prevention and control measures for soil degradation. Restore ecology as soon as possible and protect the safety of the Yangtze River. Taking the degradation of purple soil, which accounts for the largest area, as an example, the characteristics, types and occurrence status of soil degradation in this area are put forward. It is pointed out that the fragility of the environment and human disturbance in this area are the fundamental causes of soil degradation. Suggestions: (1) To establish a comprehensive protection and management of protected areas (2) To build a grid of biological hedgerows to maintain soil and water thick soil layer (3) To strengthen soil carbon and nitrogen cycle and strengthen fertilization (4) Fertilizer system, etc., in order to achieve the reconstruction of soil fertility and obtain the results of returning farmland to forest