根据西北地区盐碱土的盐分组成特点,选择NaCl、Na2SO4、NaHCO33种单盐,通过盐胁迫下3种药用甘草种子萌发特性、萌发进程、胚生长、种子活力及复水后萌发率的差异分析,比较3种药用甘草种子对不同土壤盐分的萌发响应、耐盐阈值及其适宜盐碱地种植区,为盐碱地种植药用甘草适宜生态区的选择提供理论参考.结果表明,3种单盐胁迫不同程度降低了药用甘草种子的萌发率,延长种子的萌发时间,抑制胚轴伸长生长,盐害强弱顺序为:NaHCO3 ＞Na2SO4 ＞NaCl.NaCl和Na2SO4对药用甘草种子萌发的抑制效应主要为渗透效应,盐胁迫解除复水后种子萌发恢复率为50.6％～78.5％；NaHCO3对药用甘草种子萌发的抑制效应主要为离子毒害,种子萌发恢复率仅为5.1％～21.5％；胀果甘草耐盐性最强,适宜在以氯化物-硫酸盐为主的总盐量为0～1.3％的区域种植,光果甘草耐NaHCO3最强,可在含小苏打的弃耕低盐地种植,乌拉尔甘草耐盐性最弱,种植地土壤的总盐量范围在0～0.7％为宜.%To make known the salt tolerance and suitable ecological regions of Glycyrrhiza inflata , Glycyrrhiza uralensis and Glycyrrhiza glabra from Xinjiang, the seeds of three species were salt stress treated using Na2SO4, NaCl and NaHCO3 at different concentrations to compare their germination responses, salt tolerance and suitable ecological regions. The germination percentage, mean germination days, germination energy, length of plumular axis, germination recovery percentage of three medicinal licorices were recorded. Germination percentage, relative vigor index and length of plumular axis of three species obviously declined with increased salinity. Germinate time prolonged under high salinity stress. The sequence of salt injury level of seed was NaHCO3>Na2SO4>NaCl. There was a significant difference of salt tolerance threshold among three species. G. inflata exhibited greater germination ability under salt stress than G. uralensis and G. glabra. So it is suitable planted in the soil mainly with chloride-sulfate containing 0 - 1. 3% salt. The NaHCO3 tolerance of G. glabra was the highest and can be planted in the abandoned saline land containing NaHCO3. The slat tolerance of G. uralensis was the weakest. Therefore, the optimum salt concentration for G. uralensis was 0-0.7%.
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