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研究了４种抗盐性不同牧草对Ｎａ２ＳＯ４胁迫的反应，经过１％和２％Ｎａ２ＳＯ４胁迫后，草原绢蒿、贺叶蒿、苇状羊茅和鸡脚草的叶水势、叶片相对含水量及可溶性糖的含量都随Ｎａ２ＳＯ４浓度增加而逐渐下降；脯氨酸和游离氨基酸含量都随Ｎａ２ＳＯ４浓度增加而逐渐上升。抗盐性较强的草原绍蒿和苇状羊茅的叶水势和叶片相对含水量的下降率要分别低于同科中抗盐性较差的圆叶蒿和鸡脚草；可溶性糖的下降率却大于圆叶蒿和鸡脚草；草原绢蒿和苇状羊茅的脯氨酸和游离氨氨基酸的增长率要分别大于圆叶蒿和鸡脚草。在ｌ％Ｎ８２ＳＯＩ胁迫下，两种禾本科牧草的叶绿素含量明显增加，但经２％Ｎａ＿２ＳＯ＿４胁迫后又开始下降，苇状羊茅的叶绿素含量始终高于鸡脚草。两种菊科牧草叶绿素含量随着Ｎａ＿２ＳＯ＿４浓度的增加而逐渐下降，其中，草原绢蒿叶绿素的下降率要低于圆叶蒿的下降率。
The effects of four different salt tolerance forages on Na2SO4 stress were studied. After 1% and 2% Na2SO4 stress, the leaf water potential, leaf relative water content and soluble sugar content of Seriphidium transiliense, Artemisia selengensis, Both decreased gradually with the increase of Na2SO4 concentration. The contents of proline and free amino acids increased with the increase of Na2SO4 concentration. The descending rate of leaf water potential and leaf relative water content of the grassland Artemisia selengensis and Tall fescue with stronger salt resistance were lower than that of the Artemisia selengensis and A. przewalskii with poor salt tolerance in the same family respectively. The decrease of soluble sugar But the rate was greater than that of Artemisia selengensis and Artemisia scoparia. The growth rates of proline and free amino acids of Artemisia sphaerocephala and Artemisia fescue were greater than those of Artemisia selengensis and Artemisia scoparia respectively. Under l% N82SOI stress, the content of chlorophyll of two grass species significantly increased, but the content of chlorophyll of S. fescue was always higher than that of A. japonicus after 2% Na_2SO_4 stress. The chlorophyll content of two species of Asteraceae decreased with the increase of Na_2SO_4 concentration. Among them, the decline rate of chlorophyll of Artemisia serrata was lower than that of Artemisia selengensis.