不同环境因子对梭梭种子萌发的影响

Influences of Different Environmental Factors on the Germination of Haloxylon ammodendron Seeds

该文研究了温度、盐分、干旱等环境因子对梭梭种子萌发的影响。结果表明:梭梭种子萌发速率随着温度的降低而减慢,不同温度条件下,梭梭种子的最终萌发率均在90%以上;较高浓度的Nacl溶液,对梭梭种子萌发进程具有抑制作用,当Nacl浓度大于44g/L时,最终萌发率和萌发速率显著降低,盐胁迫复水后的萌发恢复率均在60%以上;梭梭种子只能在渗透势为0^-2.4MPa的条件下萌发,随着干旱胁迫的加强,梭梭种子的萌发率和萌发速率逐渐降低,干旱胁迫复水后的萌发恢复率均在70%以上。通过研究梭梭种子对温度的广泛适应性,以及在盐胁迫和干旱胁迫后种子复水萌发的能力,探索梭梭种子萌发机制,为荒漠区植被恢复和重建提供参考。

The influences of temperature,salinity and drought stress on Haloxylon ammodendron seed germinationwere studied. The results showed that the germination rate reduced when the temperature decreased,its final germi-nation percentage could reach more than 90% in different temperature levels. The germination percentageand germi-nation ratedecreased when the salinity concentration increased,the germination decreased significantly when the con-centration of Na Cl solution exceeded 44g/L.When the incubated seeds treated in Na Cl solution were transferred todistilled,the recovery rate of the germination was more than 60%. H.Ammodendron seed only germinated when thesolution osmotic potential higher more than-2.4MPa.With the increase of osmotic stress,H.Ammodendron seeds ger-mination percentage decreased significantly. The re-germination percentage could reach more than 70% after osmot-ic stresstreatments. We concluded that H.Ammodendron had extensive adaptability to temperature conditions and there-germination ability after salinity and drought stress.