塔里木大学学报

塔里木荒漠植物种子置于不同浓度聚乙二醇(PEG-6000)和土盐胁迫下进行发芽实验,探讨植物种子对水、盐胁迫的耐受限度和适应萌发生境。结果表明:干旱与盐分胁迫均显著影响种子萌发,5种荒漠植物种子的发芽率、发芽势、发芽指数、抗旱指数(或耐盐指数)随着PEG与盐浓度的增加而降低,干旱伤害率(或相对盐害率)则随之增加。不同荒漠植物种子对PEG、盐胁迫的反应不同。综合分析各种指标得出荒漠植物抗旱性依次为:苦豆子>骆驼刺>苦马豆>黑果枸杞;耐盐能力依次为:铃铛刺>苦豆子>苦马豆。荒漠植物中苦豆子具有较高的抗旱耐盐能力,这是其在塔里木荒漠区分布范围较广的原因。

In this paper,the controlled experiment was to compare the seeds germination ability of five desert plants under water and salt stress treatment with five different concentrations.Our objective was to elucidate the limits of salt and water-tolerance of different species under different salt and PEG stress and suitable germination habitat.The results showed that the germination percentage,germination energy,germination index and drought resistance index or salt resistance index of five desert plants declined and relative salt harm rate or drought damage rate ascended with increasing salt or PEG content.Five desert plants have different reaction to different salt or PEG content.To compare with every indexes,Sophora alopecuroides L is the highest drought-resistance ability,second is Alhagi sparsifolia,third is Sphaerophysa salsula.Halimodendron halodendron is the highest salt-resistance ability,second is Sophora alopecuroides.Sophora alopecuroides is the highest drought and salt-resistance ability among five desert plant,which is the reasons to spread widely in Tarim desert area.