【摘要】 采用室内培养试验研究添加玉米秸秆和Al₂（SO₄）₃对苏打盐碱土pH值、可溶性盐含量和阳离子交换量的影响，旨在为盐碱土合理改良利用提供理论依据。研究发现，加入玉米秸秆和Al₂（SO₄）₃后，苏打盐碱土pH值有不同程度的降低。当Al₂（SO₄）₃加入量为0%～0.8%时，随着Al₂（SO₄）₃加入量的增加，苏打盐碱土pH值急剧下降，而当Al₂（SO₄）₃加入量继续增加时，则pH值变化较缓慢。Al₂（SO₄）₃加入量相同时，玉米秸秆的添加对降低苏打盐碱土的pH值具有略微促进的作用。在玉米秸秆和Al₂（SO₄）₃的共同作用下，苏打盐碱土Na⁺、K⁺、Ca²⁺和Mg²⁺的含量均升高，而CO₃^2-和HCO₃^-的含量则随着玉米秸秆和Al₂（SO₄）₃加入量的增加而逐渐降低。玉米秸秆和Al₂（SO₄）₃的加入使苏打盐碱土的阳离子交换量也有所增加，阳离子与土壤胶体上的Na⁺进行置换，最终使苏打盐碱土碱化度下降。综合而言，试验条件下，15%玉米秸秆和0.8%Al₂（SO₄）₃对苏打盐碱土的改良效果最佳。更多还原

【Abstract】 Indoor culture experiments were used to study the effects of corn stover and aluminum sulfate on the pH value,soluble salt content and cation exchange capacity of soda saline-alkaline soil to provide the theoretical basis for the rational improvement and utilization of saline-alkaline soil.The result indicated that the pH value of soda saline-alkaline soil decreased at varying degrees after adding corn stover and aluminum sulfate.When the addition amount of aluminum sulfate was 0% ～ 0.8%,the pH value of soda saline-alkaline soil was decreased sharply with the increase of the amount of aluminum sulfate.When the amount of aluminum sulfate was greater than 0.8%,the changes of pH value were slower.When the amount of aluminum sulfate was the same,the addition of corn stover could also slightly reduce the pH value of soda-alkaline soil.Combined the function of corn stover and aluminum sulfate,the contents of sodium ion,potassium ion,calcium ion and magnesium ion in soda saline-alkaline soils were all increased.The contents of carbonate ion and bicarbonate ion were decreased gradually with the addition of corn stover and aluminum sulfate.The addition of corn stover and aluminum sulfate also increased the cation exchange capacity of the soda saline-alkaline soil.The cations were replaced by the sodium ion on the soil colloid,and finally the exchangeable sodium percentage of the soda-saline-alkaline soil was decreased.In summary,under test conditions,15% corn stover and 0.8% aluminum sulfate have the best improvement effect on soda saline-alkaline soil.更多还原