罗布麻作为一种重要的耐盐性植物,在盐碱地土壤生态修复和植物引种改良等方面具有极高的应用潜力,本研究旨在对罗布麻种子萌发阶段的耐盐性进行比较,分析不同浓度盐胁迫下罗布麻种子萌发的差异。试验以罗布麻种子为材料,设置不同浓度梯度的NaCl、Na₂SO₄、NaHCO₃在种子萌发阶段进行盐胁迫。结果表明：随着盐分浓度的升高,罗布麻种子的发芽率、发芽势、发芽指数均有所下降,低浓度盐胁迫对罗布麻种子萌发的抑制相对不显著,但高浓度盐胁迫抑制效果显著。随着盐浓度的上升,起始萌发时间会出现滞后现象,且NaCl对罗布麻种子起始萌发时间的滞后最明显,NaHCO₃次之,Na₂SO₄相较最不明显。罗布麻种子萌发对NaCl较敏感,抑制作用最强。同时NaCl对种子的萌发延缓作用高于其他2种盐。耐盐性结果比较显示,3种盐的耐盐适宜浓度、耐盐半致死浓度、耐盐极限浓度为Na₂SO₄高于NaHCO₃和NaCl,罗布麻对Na₂SO₄的耐盐极限浓度可达7.81%。相较于Na⁺~Cl^-型盐碱土引种栽植,罗布麻更适宜Na⁺~SO₄^2-型盐碱土。

Apocynum venetum, as an important salt-tolerant plant, has great application potential of soil ecological remediation and plant introduction & improvement in saline land. This study compared the salt-tolerance of Apocynum venetum seeds during germination and analyzed the difference in seed germination under different concentrations of salt stress. In the experiment, Apocynum venetum seeds were used as materials, and different concentration gradients of NaCl, Na₂SO₄, and NaHCO₃ were set for salt stress during the seed germination stage. The results showed that with the increase of salt concentration, the germination rate, germination potential and germination index of Apocynum venetum seeds decreased. The inhibitory effect of low concentration salt stress on the germination of Apocynum venetum was not significant, but the high concentration salt stress had a significant inhibitory effect. As the salt concentration increased, the initial germination time was postponed, NaCl had the most obvious delay effect on the initial germination time of Apocynum venetum seeds, followed by NaHCO₃, and Na₂SO₄ had the least effect. Apocynum venetum seed germination was more sensitive to NaCl,NaCl had the strongest inhibitory effect. At the same time, the delay effect of NaCl on the germination speed of seeds was higher than that of the other two salts. The suitable concentration range, half-lethal concentration and fatal concentration of Na₂SO₄ were higher than that of NaHCO₃ and NaCl. The fatal concentration of Na₂SO₄ could be 7.81%. Compared with Na⁺~Cl^- type saline soil, Apocynum venetum is more suitable for Na ⁺~SO₄^2- type saline soil.