不同盐碱条件下白榆器官中K^+、Na^+、Ca^(2+)和Mg^(2+)分布特征

Under the Conditions of Different Salinity the K^+,Na^+,Ca^(2+) and Mg^(2+) Distribution in Different Organs of Ulmus pumila

为了探明白榆(Ulmus pumila)适应盐碱环境的机理,以高盐、中低盐、非盐碱3个土壤盐分立地条件下生长的白榆为试验材料,研究不同盐分浓度下新叶、老叶、新枝、老枝和根5个营养器官中4种金属盐离子分布特征。结果表明,白榆体内K+、Na+、Ca2+和Mg2+不同部位的含量不同,并存在显著差异;白榆各部位K+、Na+含量随着生长地区土壤盐分的增加而增加;K+/Na+幼嫩器官显著高于成熟器官,茎叶显著高于根部;含盐中低等土壤中生长的白榆K+/Na+高于高盐和非盐碱土壤中生长白榆。白榆器官中K+、Na+、Ca2+对盐碱的敏感性高于Mg2+,K+和Na+是4种金属盐离子中白榆在盐渍生境下进行渗透调节作用的主要因素。

In order to investigate the adaptability mechanism of Ulmus pumila in saline environment distribution characteristics of potassium,sodium,and calcium ions in new leaves,old leaves,new branches and root regetative,of U.pumila under high,low and non-salinity soil were studied.The results showed that there were significant differences in the content of K+,Na+,Ca2+ and Mg2+ in different organs of U.pumila.The content of K+,Na+ in the plant increased as the soil salinity concentration of growth region increased;...