Abstract: The obvious change of properties of alkali soil is due to the decrease of soluble salt content after the growth of P. tenuiflora. The most effect on salt content of the alkali soil was the grass has grown for two years. Along with the increasing of number of year of the grass growth for CO₃^2-,HCO₃^- and Na⁺ content decreased year after year. There was no distinct change of value of Cl^-, but there was a decreased trend of SO₄^2- and K⁺ content of soil. The effect of the growth of the grass on pH and the content of salt、organic matter,total nitrogen,total Na⁺、K⁺、Ca⁺ and Mg⁺ were limited to a certain depth of the soil,the difference of the surface layer of soil between soil section the grass grown in and alkali spot soil were bigness and reduced follow the depth of soil fortified. From tiller stage to tassel stage (pregnant stage),pH and content of total salt,CO₃^2-、HCO₃^-、Na⁺、K⁺、Ca⁺ and Mg⁺ of the soil(0～10 cm soil layer) the grass grown in increased,and to complete mature stage decreased,which of the alkali spot soil had the resemble disciplinarian. The pH value and total salt content of CO₃^2-、HCO₃^-、Na⁺ and K⁺ of the soil of the grass grown in three years were lower than that of alkali spot soil,but Ca⁺ and Mg⁺ content of which were higher than that of alkali spot soil obviously.

Key words: Puccinellia tenuiflora, Growth number of year, Growth and developmental stage, Alkali soil, Chemical properties

摘要： 星星草使碱化土壤化学性质发生较明显的变化是降低了可溶性盐含量。二年生星星草对土壤含盐量的影响较大。随着星星草生长年限的增加,CO₃^2-、HCO₃^-和Na⁺含量逐年减少,Cl^-含量变化不明显,SO₄^2-和K⁺呈减少趋势,Ca²⁺和Mg²⁺则呈增加趋势。星星草对土壤含盐量、pH值、有机质、全氮、钾、钠、钙和镁含量的影响仅限于土层的一定深度。星星草土壤与碱斑土壤比较,表土层的差别较大,土层越深差别越小。从分蘖期到抽穗期(或孕穗期),0～10cm土层的全盐、pH值、CO₃^2-、HCO₃^-、Na⁺、K⁺、Ca²⁺和Mg²⁺含量逐渐升高,到完熟期逐渐降低。碱斑土壤全盐、pH值、CO₃^2-、HCO₃^-、Na⁺、K⁺含量亦表现相似规律。总之,3年生星星草土壤全盐、pH值、CO₃^2-、HCO₃^-、Na⁺、K⁺含量明显低于碱斑土壤,但Ca²⁺和Mg²⁺含量则明显高于后者。

关键词: 星星草, 生长年限, 生育期, 碱化土壤, 化学性质