四种耐盐植物根际土壤盐分运移特征研究

The Characteristics of Soil Movement in Coastal Saline Soil of Four Salt-tolerant Plants

以天津市大港农场盐渍化土壤为研究背景,对4种耐盐植物根际和非根际土壤pH值和土壤盐分含量的变化进行了比较分析。结果表明,种植耐盐植物对表层土壤具有明显的脱盐效果,其中田菁对表层及0～80 cm土层的脱盐效果最好。10月份时耐盐植物处理表层土脱盐效果顺序为田菁>苏丹草>苜蓿>碱蓬,其0～20 cm土层与对照相比平均脱盐率为45.97%,44.06%,43.75%,37.12%。10月0～80 cm土层整体各处理的脱盐顺序为田菁>苜蓿>苏丹草>碱蓬。4种耐盐植物能够抑制土壤盐分累积,但同时也提高了土壤pH值。4种耐盐植物具有明显的降盐效果,但同时也应注意土壤碱化问题。

Based on coastal saline soil of Dagang farm of Tianjin, the experiment was conduced on four salt-tolerant plants to investigate dynamic changes of pH and EC （Electrical Conductivity） between the rhizosphere soil and bulk soil. The results showed that four salt-tolerant plants treatments have obvious function of restraining salt accumulating in surface layer. Sesbania cannabina Pers had best effects on restrainting the accumulation of soil salinity in surface layer and 0 -80 cm layers. The reduced water-soluble salt sequence from higher to lower was Sesbania cannabina 〉 Sorghum sudanense 〉 Medicago sativa 〉 Suaeda salsa on October,18th,2013, the reduced salt percentage in surface layer which compared with comparison treatment was 45.97% ,44.06%, 43.75%, 37.12%, respectively. The reduced water-saluble salt sequence from higher to lower was Sesbania cannabina 〉 Medicago sativa 〉 Sorghum sudanense 〉 Suaeda salsa on October. Although pH in soil increased compared with comparison treatment, planting salt-tolerant plants can effectively restraint the accumulation of soil salinity. Therefore, the potential soil alkalization of salt-tolerant plants should be considered seriously.