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将中性盐 Na Cl和 Na2 SO4 、碱性盐 Na HCO3和 Na2 CO3按不同比例混合 ,模拟出 30种盐度、碱度各不相同的复杂盐碱条件 ,并对向日葵苗进行盐碱混合胁迫处理。测定其日相对生长率 (RGR)等 7项胁变指标 ,并分析各种致胁变因素与诸项胁变指标间的相互关系。结果表明 :用盐度、缓冲量、p H和 [Cl- ]即可代表所有胁迫作用因素。用此四因素与诸项胁变值间进行多元线性回归分析 ,结果证明 :诸胁变指标与这四因素间均具有高度线性相关性。四因素对胁变的贡献明显不同 ,其中缓冲量和盐度是决定性的主导因素 ,p H和 [Cl- ]的作用明显次之 ,有时甚至可以忽略。分析结果表明 :缓冲量和盐度是复杂盐碱条件对向日葵胁迫作用的主导因素。
The neutral salt Na Cl and Na2 SO4, basic salt Na HCO3 and Na2 CO3 mixed in different proportions to simulate the 30 kinds of salinity and alkalinity of complex saline-alkali conditions, and sunflower seedlings salt-alkali mixed stress deal with. The daily relative growth rate (RGR) and other seven indicators were determined, and the relationship between various risk factors and various indicators was analyzed. The results show that all salinity factors can be represented by salinity, buffer amount, p H and [Cl-]. Multiple linear regression analysis between these four factors and various threat values showed that there was a highly linear correlation between the threat indices and these four factors. The contribution of the four factors to the change of the cohort is obviously different. The amount of buffer and the salinity are the decisive dominance factors. The effect of p H and [Cl-] is obvious, sometimes negligible. The results showed that the amount of buffer and salinity were the main factors that affected the stress on sunflower under complex saline-alkali conditions.