高垄滴灌条件下盐碱地土壤盐分再分布研究

Research on Salt Redistribution of Alkali-saline Soil Under High Ridge and Drip Irrigation

针对引黄灌区水资源短缺和土壤盐渍化两大资源环境问题,以节水防盐为目标,通过田间试验,将能提高地温、增加土壤透气性的高垄与能提高水资源利用率和利用效率、将局部土壤盐分淡化的滴灌相结合,探究高垄滴灌条件下盐渍化土壤的水盐运动规律,结果表明,在中度盐碱化土地上,滴灌可以有效地减小高垄上的盐分,使盐分聚集在垄中央;在重度盐碱化土地上,滴灌可以有效降低垄的全盐量并将垄中盐分淋洗在垄沟中。归纳出适应性盐碱地利用技术和作物种植模式,为引黄灌区盐碱地改良利用提供技术支持。

According to the water shortage and alkali- saline soil in Yellow River irrigation area of Ningxia, the high ridge and desalination are combined through field experiment with the goal of water saving and salt prevention, so as to explore the water and salt movement law of saline soil under high ridge and drip irrigation. The high ridge contributes to improve soil temperature and increase soil permeability, while the drip irrigation helps to improve the water utilization rate and efficiency, and desalinate local soil salt. It turns out that the salt of high ridge in moderate alkali-saline soil can be reduced effectively by drip irrigation with the salt aggregating in the middle of ridge; and drip irrigation can reduce effectively the total salt content of ridge and elute the salt in furrow. Meanwhile, the technology applicable to alkali- saline soil and corps planting patterns are generalized, providing technical support for the modification of saline-alkali soil in Yellow River irrigation area of Ningxia.