盐胁迫对荆条、白蜡、沙枣种子萌发的影响

用不同浓度的NaCl、Na₂CO₃混合盐胁迫梯度，对荆条、白蜡和沙枣种子进行了种子萌发实验，观察了3个物种在盐胁迫下的发芽率、发芽速度和胚根生长，比较了光照和黑暗条件下3种植物种子的萌发差异。结果表明：光照对3种植物种子的萌发有明显的促进作用，但对胚根生长的影响却各不相同。低浓度混合盐溶液对荆条、白蜡种子萌发有促进作用，对沙枣有轻度抑制。当盐胁迫浓度超过0.8%，3种植物种子的萌发均受到不良影响，尤其对荆条的影响较大。3种植物均能在盐渍化生境中生长，3者均可作为园林植物在天津试验栽培。沙枣在天津塘沽地区盐碱地上进行广泛种植完全具有可行性。

Effect of salt stress on seed germination of Vitex negundo,Fraxinus velutina and Elaeagnus angustifolia

The seeds of Vitex negundo,Fraxinus velutina and Elaeagnus angustifolia were treated with different concentration mixture of NaCl and Na_2CO_3.Their germination percentage,speed and the growth of radical under salt stress,the germination in light and darkness,were measured and analysed.The results showed that the light prominently promote seed germination of the three plants,and the effect of light to the growth of radical is different.Lower concentrations of salt promoted seeds germination of Vitex negundo and Fraxinus velutina,slightly restrained of Elaeagnus angustifolia.The effect to the three plants are bad especially to Vitex negund when the salt concentration exceeding 0.8%.The three plants can be cultivated in the salinity soil and cultivated as landscape plant in Tianjin.Elaeagnus angustifolia widely planted is viable in Tanggu.