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通过几种主要造林树种在盐胁迫下体内Ｎａ＋和Ｋ＋含量变化的分析，对树木耐盐性及其机理进行了讨论。结果表明：不同树种的Ｎａ＋和Ｋ＋含量及在盐胁迫下的变化动态存在明显差异，说明其耐盐机制不同，树木的Ｎａ＋和Ｋ＋的质量比值，随ＮａＣｌ的质量浓度的增加而上升，其上升幅度在耐盐性强的白榆中较小；在盐胁迫下，适当地增加Ｃａ２＋，可维持树木体内较低的Ｎａ＋和Ｋ＋的质量比，从而提高树木耐盐性。
Through the analysis of the change of Na + and K + content in the main tree species under salt stress, salt tolerance and its mechanism of the tree were discussed. The results showed that the Na + and K + content of different species and their dynamic changes under salt stress were significantly different, indicating that their salt tolerance mechanism is different, the tree’s mass ratio of Na + and K +, with the increase of the concentration of NaCl increased, and its rise The range of salt tolerance was less in Ulmus pumila. Under salt stress, the Ca2 + concentration was increased moderately to maintain the lower Na + and K + mass ratio in the tree, thus improving the salt tolerance of the tree.