柠檬酸存在下施硅对土壤磷吸附和解吸特性影响  

Characteristics of Phosphorus Adsorption and Desorption in Brown Soil with Presence of Citric Acid and Silicon Fertilizer

作　　者：张广才[1] 王佼[1] 张昀[1] 燕香梅[1,2] 关连珠[1] 

机构地区：[1]沈阳农业大学土地与环境学院,辽宁沈阳110866 [2]沈阳市农业检测中心,辽宁沈阳110034

出　　处：《水土保持通报》2013年第3期49-52,134,共5页Bulletin of Soil and Water Conservation

摘　　要：以棕壤为研究对象,采用室内培养的方法,通过加硅酸钙处理、硅酸钙+1mmol/L柠檬酸处理和硅酸钙+2mmol/L柠檬酸处理,研究了柠檬酸存在下施硅对棕壤中磷素吸附和解吸特性的影响,并用Langmuir方程、Freundlich方程与Temkin方程对其进行拟合分析,其中磷吸附解吸试验采用恒温批处理平衡法。结果表明,Langmuir与Temkin模型对处理后棕壤磷的吸附拟合效果最好。硅酸钙+1mmol/L柠檬酸处理的棕壤对磷的吸附量最大,为500mg/kg;硅酸钙+2mmol/L柠檬酸处理的棕壤对磷的解吸量及解吸率最大,最大解吸率可达45.2%。因此,硅酸钙+1mmol/L柠檬酸处理的棕壤对磷肥的储存能力最强,硅酸钙+2mmol/L柠檬酸处理的棕壤对磷活化能力最强,即供磷能力最强。Laboratory experiment with different kinds of treatments on texted brown soil,namely original soil ＋calcium silicate（CaSiO3）,original soil＋1mmol/L citric acid＋CaSiO3and original soil＋2mmol/L citric acid＋CaSiO3,was conducted to investigate the characteristics of soil phosphorus（P）adsorption and desorption in the presence of citric acid and silicon fertilizer by Langmuir,Freundlich and Temkin equation fittings.The OECD Guideline106batch equilibrium method was used for adsorption and desorption experiments.Results showed that the brown soil P adsorption fitted Langmuir and Temkin models better.The soil added calcium silicate and 1mmol/L citric acid treatment had the maximum adsorbed P,with the maximum adsorption capacity of 500mg/kg.The soil with calcium silicate and 2mmol/L citric acid treatment had the greatest desorption rate of P,with the maximum desorption rate of 45.2%.Therefore,the soil added calcium silicate and 1mmol/L citric acid treatment had the strongest storage capacity for P,and the soil added calcium silicate and 2mmol/L citric acid treatment had the strongest activation ability and supply capacity of P.

关 键 词：柠檬酸 硅 土壤磷 吸附 解吸 

分 类 号：S151[农业科学—土壤学]