盐碱胁迫下燕麦生长及阳离子吸收特征

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.

Oat growth and cation absorption characteristics under salt and alkali stress

This paper monitored the oat growth and cation absorption characteristics on a saline-alkali soil in the Baicheng region of Jilin Province under low,medium,and high levels of salt stress.No significant differences were observed in the shoot growth and yield components under the three levels of salt stress,but the root biomass and root/shoot ratio decreased significantly with increasing salt stress level.At maturing stage,the root/shoot ratio under medium and high salt stresses was 77.2% and 64.5% of that un...