滴灌条件下不同盐生植物对盐渍化土壤的脱盐效果研究

Effects of Different Halophyte Plants on Soil Desalination under Drip Irrigation Conditions

【目的】研究滴灌条件下种植盐生植物对盐渍化土壤的脱盐效果。【方法】在滴灌条件下种植盐生植物海蓬子和盐地碱蓬。【结果】盐生植物对耕作层土壤特别是0～20 cm土壤盐分影响显著,可有效降低土壤总盐含量以及盐分离子Na+、Cl-和K+浓度,但对土壤pH值影响不明显。种植盐地碱蓬的土壤总盐量下降幅度要高于海蓬子;种植盐地碱蓬土壤Na+、K+的含量下降较明显,而种植海蓬子土壤的Cl-含量明显降低。【结论】滴灌抑盐+生物脱盐模式在改良盐渍化土壤中效果明显,盐地碱蓬可作为较理想的脱盐植物,对于盐渍化土壤的开发利用具有一定的指导意义。

【Objective】A field experiment was conducted to evaluate the effect of planting halophyte on desalination in salinization soil under drip irrigation conditions.【Method】Two kinds of halophyte plants Suaeda salsa and Salicornia bigelovii were used in this study.【Result】The result showed that soil salinity were influenced significantly by both Suaeda salsa and Salicornia bigelovii under the drip irrigation conditions,especially for soil salinity of 0-20 cm layer.The total salt content,Na＋,Cl-,and K＋ concentration in soil were reduced significantly by planting halophyte plants,but the soil pH was not affected.Suaeda salsa had the better desalination effects than Salicornia bigelovii.Salt ions Na＋ and K＋ concentrations were decreased with planting Suaeda salsa and Cl-concentration was reduced significantly with planting Salicornia bigelovii.【Conclusion】The pattern of drip irrigation combined with biological desalination mode could ameliorate soil salinization and Suaeda salsa can be used as the suitable desalination plant.Those results make sense for utilization of saline soil.