西北内陆地区微咸水交替灌溉试验研究

Experiment on application of micro-saline water alternative irrigation in north-west China

我国西部内陆地区淡水资源紧缺,微咸水的开发利用成为缓解农业水资源紧缺的重要措施。本研究在西部内陆地区进行了不同矿化度的微咸水交替灌溉试验,采用在玉米生育中期进行咸水灌溉的措施,研究了交替灌溉对当地土壤水盐运移规律以及作物产量的影响。研究结果表明依据农民的灌溉习惯,土壤水分能较好的满足玉米生长的需求;在灌溉淋洗及蒸发积盐的双重作用下,收获后各处理的土壤含盐量均较播种前有所降低;3 g/L和5g/L的微咸水灌溉处理条件下玉米的产量下降均小于10%。

Due to shortage of fresh water in north-west China,exploitations of saline water become very important for mitigating water shortage of farmland irrigation.In order to research the effect of water and salt transport rule and crop yield under saline water irrigation,the plot experiments under different saline water alternative irrigation in north-west China was conducted,and the saline water irrigation happened in the middle growth stage of corn.The results showed that the soil moisture can meet the demand of corn growth in accordance with farmers＇ irrigation experiments.Under the effect of leaching and evaporation,the soil salt content was lower than pre-sowing.The decrement of yield was less than 10% under the irrigation with 3 g/L and 5 g/L of saline water.