宁夏青铜峡灌区水土盐量的衰减和积聚进程分析

Analysis on the process of deduction and accumulation of salinity in phreatic water and soil in irrigation area

本文以青铜峡灌区的水、土盐量监测资料为依据,分析了土壤、潜水和引排水盐量的演化进程,计算出灌区40年总计净引入黄河水1257 7亿m3,年均净引入水量为31 4亿m3,水土总计排出5254 9万t有害盐量,积聚了769 3万t无害盐量。灌区内适用于农业灌溉的潜水和非盐渍化土的分布范围区显著扩大,标志着水土朝向脱盐淡化的方向演化。

The evolution of salinity content in soil and phreatic water in Qingtongxia irrigation area, Ningxia Autonomous Region, China, was analyzed according to the monitoring data in 40 years. The calculation result shows that the irrigation area attained about 125.77 × 109 m3 of water from the Yellow River, 52.55 × 106 t of harmful salt was drained away and 7.69 × 106 t of harmless salt was accumulated. The volume of phreatic water suitable for irrigation increases and the extent of desalinized field remarkably expanded. These indicate that both soil and water in this irrigation area are in the process of progressively desalinized.