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在吉林白城地区盐碱土上监测了3个盐分胁迫水平下燕麦的生长动态及对土壤阳离子的吸收特征.结果表明:在低度、中度和高度3个胁迫水平下燕麦地上部生长和产量构成因素没有显著差异,但根部干质量和根冠比随盐碱胁迫程度的加重而显著降低,在成熟期,中度和高度胁迫下的根冠比分别是低度胁迫下的77.2%和64.5%.3个胁迫水平下燕麦的K+/Na+和Ca2+/Na+在三叶期差异最大,而在抽穗期无显著差异.随着盐分胁迫程度的加重,燕麦的离子吸收选择性系数在灌浆期显著降低,而运输选择性系数无显著变化.因此,燕麦能够在一定程度上适应苏打碱土的盐碱胁迫,适应能力随着胁迫水平的增加而降低;燕麦根部生物量的减少和抽穗期较强的离子选择吸收能力可能有利于地上部的生长和产量构成.
The growth dynamics of oat and the absorption characteristics of soil cations under three salt stress levels were monitored on saline-alkali soil in Baicheng, Jilin Province.The results showed that the growth and yield components of oat under the three levels of low, moderate and high stress The root dry weight and root / shoot ratio decreased significantly with the aggravation of saline-alkali stress. The ratio of root to shoot at moderate, moderate and high stress was 77.2% and 64.5% under low stress, respectively. Under the three stress levels, K + / Na + and Ca2 + / Na + of oats had the highest difference in the three-leaf stage but no significant difference in the heading stage.As the degree of salt stress aggravated, the selective coefficient of ion absorption of oats decreased significantly during grain filling stage , While no significant change in transport selectivity.As a result, oat could adapt to saline-alkali stress of soda ash soils to a certain extent, and its adaptability decreased with the increase of stress level. The reduction of oat root biomass and strong heading time Choosing absorptive capacity may be beneficial to shoot growth and yield composition.