一、坝地盐碱化概况打坝淤地是黄土丘陵沟壑区充分利用水、土、肥资源变荒沟为良田的一项有效的水土保持措施,也是建设高产稳产基本农田的重要途径之一。由于“水坠坝”、“水枪”等先进技术的推广使用,陕北打坝淤地发展很快。在1975年底以前,延安、榆林两地区即已打淤地坝四万多座,可淤地88万亩,已淤地53.1万亩,每亩产量往往在五百斤以 First, the salinization of dam Overview Dam dams is the loess hilly and gully area to make full use of water, soil and fertilizer resources into wasteland as fertile land is an effective water conservation measures, but also to build high yield and stability of basic farmland one of the important ways . Due to the popularization and application of advanced technologies such as “Water Falling Dam” and “Water Gun”, the construction of dam land in northern Shaanxi has been developing rapidly. Before the end of 1975, Yan’an and Yulin districts had already covered more than 40,000 silt dam areas, with 88,000 mu of silting land and 531,000 mu of silting land. The yield per mu was often over 500 kilos