不同耐盐植物对滨海盐土可溶性盐分运移的影响

为了揭示耐盐植物在生长期内对土壤盐分含量的影响，采用田间试验与室内分析相结合的方法，用电导率仪法测定土壤电导率，用玻璃电极法测定pH值。结果表明：种植耐盐植物对表层土壤具有明显的脱盐效果,其中柽柳对表层及0~80 cm土层的脱盐效果最好。8月份时，耐盐植物处理脱盐效果由高到低的顺序为T3>T1>T2>T4，其表层与对照相比脱盐率分别达到72.11%、52.16%、40.90%、23.63%。种植植物处理处理随时间的推移表层土壤盐分的变化趋势是先下降后上升，在12月份时，表层土壤脱盐顺序为T3>T2>T1>T4，其表层与对照相比脱盐率分别达到78.26%、71.91%、48.79%、40.09%，种植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。种植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。

Effect of Planting Salt-tolerant Plants on Water-soluble Salt in Coastal Saline Soil

Field experiment combined with laboratory analysis was conducted to investigate the effect of salt-tolerant plants in the period of growing season on the water-soluble salt in coastal saline soil. The conductivity meter method and glass electrode method were used to determine the conductivity and the value of pH in soil, respectively. The results showed that four salt-tolerant plants treatments had obvious function of restraining salt accumulation in surface layer. Tamarix chinensis had best effects on restraining the accumulation of soil salinity in surface layer and 0-80 cm layers. The reduced water-soluble salt sequence was T3〉TI〉T2〉T4 on 16th August, 2010. The reduced salt percentage in surface layer which compared with comparison treatment was 72.11%, 52.16%, 40.90%, 23.63%, respectively. The trend of water-soluble salt percentage in surface layer changed from decline to rise with increasing treated time. The reduced water-soluble salt sequence was T3〉T2〉TI〉T4 on 17th December, 2010. The reduced salt percentage in surface layer which compared with comparison treatment was 78.26%, 71.91%, 48.79%, 40.09%, respectively. Although pH in soil increased than that of comparison treatment, planting salt-tolerant plants could effectively restraint the accumulation of soil salinity. Therefore, it should took potential soil alkalization seriously on planting salt-tolerant plants.