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利用中性盐NaCl、Na2SO4和碱性盐NaHCO3按不同质量比混合,模拟出15种盐碱度各不相同的盐碱逆境条件,进行光皮桦种子萌发试验,研究盐碱胁迫对光皮桦种子萌发及幼苗生长的影响.结果表明,在不同盐碱处理下,随着盐浓度及pH值的增加,种子发芽率、发芽指数均呈下降趋势,对幼苗胚生长抑制作用加强;在pH≥8.78,盐浓度≥100mmol/L胁迫下,光皮桦种子的萌发明显受到抑制,且萌发进程延缓,当盐浓度高达250mmol/L时,各盐碱处理下的光皮桦种子均不萌发;在pH≥7.08,盐浓度>50mmol/L胁迫下,光皮桦早期幼苗无法正常生长;碱性盐对种子萌发的抑制作用强于中性盐.
Salt-alkali stress was used to study the seed germination of Betula luminifera under salt-alkali conditions with different salt-alkali adversity conditions by using neutral salt NaCl, Na2SO4 and alkaline salt NaHCO3 mixed at different mass ratios, Seed germination and seedling growth.The results showed that seed germination rate and germination index decreased with the increase of salt concentration and pH, 8.78, the seed germination was inhibited obviously and the germination process was slowed down under the salt concentration ≥100mmol / L. When the salt concentration was as high as 250mmol / L, Under the conditions of pH≥7.08 and salt concentration> 50mmol / L, the early seedlings of P. radiata could not grow normally. The alkaline salt inhibited the seed germination more strongly than the neutral salt.