土壤盐碱化一直是制约河套灌区农业生产发展的主要障碍因素。灌区节水改造工程实施后 ,土壤盐碱化是否会进一步恶化 ?灌区合理的排灌比应该是多少 ?一直是人们所担心的问题。内陆干旱区干排水 (或非耕地天然垂直排水 )是灌区重要排水方式 ,根据这一客观事实 ,对灌区宏观的盐分均衡进行了分析 ,解释了灌区土壤盐碱化近些年有所改善这一事实 ,并提出节水改造实施后灌区合理的排灌比 Soil salinization has been a major obstacle to the development of agricultural production in Hetao Irrigation District. Irrigation area after the implementation of water-saving projects, soil salinization will deteriorate further? Irrigation area reasonable irrigation ratio should be what? People have been worried about. The dry drainage in inland arid area (or natural vertical drainage of non-arable land) is an important drainage method in the irrigation area. Based on this objective fact, the macroscopic salt balance in the irrigation area is analyzed, which explains that the salinization of soil in the irrigation area has been improved in recent years. A fact, and put forward water saving and transformation after the implementation of reasonable irrigation and drainage irrigation ratio