关键词: 星星草, 生长年限, 生育期, 碱化土壤, 化学性质

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