据中国科学院自然资源综合考查委员会资料(1978),河西走廊土地辽阔,热量丰富,降水稀少,水量不足是其农业自然资源的主要特点。宜农荒地约1350万亩。这些宜农荒地大部位于各流域下游,盐碱严重,开发利用之前必须考虑根治盐碱问题;已垦熟地的盐碱问题,也没有得到根本解决,主要是因以往采取的明渠排盐方法排水沟间距大,排盐效果不良所致。为了探求埋设暗管排盐的效果,于1976—78年在3000亩盐碱地上进行了埋管暗排改良盐碱土 According to the CAS (1978), the Hexi Corridor is characterized by vast land, abundant heat, scarce precipitation and insufficient water resources as its main agricultural natural resources. Appropriate agricultural wasteland of about 1350 acres. Most of these suitable farmland and wasteland are located in the lower reaches of all the river basins. There is a serious problem of salt and alkali. Before the development and utilization, the problem of salinization must be considered. The saline-alkali problem of reclaimed land has not been fundamentally solved yet, mainly due to the drained Gully spacing, salt discharge due to poor results. In order to explore the effect of buried pipe drainage, in 1976-78 in 3000 mu of salt and alkali soil buried pipe to improve the saline-alkali soil