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以抗盐性较强的苇状羊茅和抗盐较差的鸭茅为材料，研究了Ｎａ_２ＳＯ_４胁迫对Ｎａ~＋、Ｋ~＋吸收及分配的影响。随着Ｎａ_２ＳＯ_４胁迫的加重，两种牧草根及叶中的Ｋ￣＋含量都下降，而Ｎａ~＋含量却急剧增长，Ｎａ~＋的增长幅度远远超过Ｋ~＋的下降幅度。鸭茅叶片中Ｎａ~＋的增加幅度大于苇状羊茅，而苇状羊茅根中Ｎａ~＋的增加幅度大于鸭茅。随着盐胁迫的增加，两种牧草根、叶中的Ｎａ~＋／Ｋ~＋比均上升，鸭茅叶片中的Ｎａ~＋／Ｋ~＋比增长幅度大于苇状羊茅，而苇状羊茅根中Ｎａ~＋／Ｋ~＋的增长幅度大于鸭茅。盐胁迫导致两种牧草质膜透性增加，而鸭茅膜伤害程度大于苇状羊茅。两种牧草的膜伤害程度与它们叶片中Ｎａ~＋／Ｋ~＋比的增加幅度呈现显著正相关。两种牧草根叶中Ｎａ~＋含量的高低与牧草的抗盐性没有一致的关系，但盐胁迫下叶片中Ｎａ~＋及Ｎａ~＋／Ｋ~＋比的增加幅度却与牧草的抗盐性呈现负相关。
The effects of Na_2SO_4 stress on the Na ~ +, K ~ + uptake and distribution were studied by using tall salt resistant fescue and poorly tolerant Dactylis glomerata. With the aggravation of Na_2SO_4 stress, the content of K_ (+) in both herbage roots and leaves decreased, while the content of Na ~ + increased sharply. The increase of Na ~ + far exceeded that of K_ +. The increase of Na ~ + in the leaves of A. sinensis was larger than that of F. fescue, while that of A. fescue was greater than that of A. dactylis. With the increase of salt stress, the Na ~ + / K ~ + ratios of both herbage roots and leaves increased, while the Na ~ + / K ~ + ratio of A. oryzae leaves increased more than that of tall fescue The growth rate of Na ~ + / K ~ + in Forsythia pseudo-ginseng was higher than that of Dactylis glomerata. Salt stress resulted in increased permeability of the plasma membrane of both species of grass, while the damage degree of the ducks was greater than that of the fescue. The damage degree of the two forages was significantly and positively correlated with the increase of Na ~ + / K ~ + ratio in their leaves. The contents of Na ~ + in leaves of two kinds of forage grass were not consistent with the salt resistance of forage grass, but the increasing rates of Na ~ + and Na ~ + / K ~ + ratio in salt leaves were opposite to those of forage Sex negative correlation.