【摘要】 为了揭示硫酸铝改良剂对苏打盐碱土在秸秆还田条件下固碳性能的影响,研究了添加秸秆和硫酸铝并于恒温条件下培养300天后的盐碱土对腐殖酸的吸附性能。结果表明:在腐殖酸吸附动力学中,秸秆和硫酸铝不同添加量条件下,盐碱土对腐殖酸的吸附均在120min时达到平衡,准二级动力学方程拟合效果最好,R2值最高(0.936)。Langmuir方程和Freundlich方程均可较好地拟合盐碱土对腐殖酸的等温吸附。添加相同比例的玉米秸秆条件下,Langmuir方程拟合获得的最大吸附量分别表现为69.335,42.830,40.498,42.593mg/g。而添加同等比例的硫酸铝改良剂条件下,最大吸附量分别表现为21.358,32.647,69.335,49.232,62.375,42.830mg/g。更多还原

【Abstract】 Aluminum sulfate improver has a good effect on reducing the pH of soda saline and alkaline soil and promoting soil colloidal condensation and organic carbon accumulation.In order to reveal the effect of aluminum sulfate improver on the carbon sequestration performance of soda saline-alkali soil under straw returning conditions,the adsorption performance of saline-alkaline soil on humic acid was studied after adding straw and aluminum sulfate and culturing for 300 days under constant temperature conditions.The results showed that in the adsorption kinetics of humic acid,under the different addition conditions of straw and aluminum sulfate,the adsorption of humic acid by saline-alkali soil reached the equilibrium of the quasisecond-order kinetic equation at 120 min,R2.The highest value(0.936).Both the Langmuir equation and the Freundlich equation can better fit the isothermal adsorption of humic acid by saline-alkaline soil.Under the condition of adding the same proportion of corn stover,the maximum adsorption amount obtained by the Langmuir equation was 69.335,42.830,40.498 and 42.593 mg/g,respectively.Under the condition of adding the same proportion of aluminum sulfate improver,the maximum adsorption amounts were 21.358,32.647,69.335,49.232,62.375 and 42.830 mg/g,respectively.更多还原