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针对干旱半干旱地区水资源短缺问题,进行了微咸水灌溉条件下不同灌溉方式对膜下滴灌棉花土壤盐分影响的测坑试验.试验共设计了3种灌溉方式:淡水(1.08g/L)、微咸水(3.00g/L)和咸淡交替轮灌(1.08与3.00g/L).试验结果表明:淡水灌溉对土壤的脱盐效果最好,采用微咸水灌溉时最好采用咸淡交替轮灌方式,它可以避免土壤发生积盐现象;在灌溉定额为5250m3/hm2时,非轮灌情况下,盐峰发生在20cm处,轮灌可将盐峰下移至40cm处,这为咸水资源的合理利用提供了理论依据.
Aiming at the shortage of water resources in arid and semi-arid regions, the effect of different irrigation methods on the salinity of cotton soil under drip irrigation was studied under the condition of brackish water irrigation.Three kinds of irrigation methods were designed: fresh water (1.08g / L) , Brackish water (3.00g / L) and alternate irrigation (1.08 and 3.00g / L) respectively.The results showed that freshwater irrigation had the best desalination effect on soil, In the case of irrigating quota of 5250m3 / hm2, the salt peak occurs at 20cm in the case of non-irrigated irrigation, and the salt peak can be moved down to 40cm under the irrigation of rotations The rational use of salt water resources provides a theoretical basis.