施硅条件下不同有机酸对土壤磷吸附解吸的影响  

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

作　　者：王秀云[1] 燕香梅[2,3] 解占军[4] 

机构地区：[1]辽宁省新民市农业技术推广中心,辽宁沈阳110300 [2]沈阳市农业检测总站,辽宁沈阳110034 [3]沈阳农业大学土地与环境学院,辽宁沈阳110866 [4]辽宁省农业科学院,辽宁沈阳110161

出　　处：《辽宁农业科学》2014年第4期39-42,共4页Liaoning Agricultural Sciences

摘　　要：采用室内培养和恒温批处理平衡方法,研究了在施加硅酸钙前提下,2 mmol/L柠檬酸、乙酸和草酸对磷素在棕壤中吸附和解吸的影响,并用Langmuir方程进行拟合分析。研究结果表明,Langmuir方程的拟合效果很好;加硅酸钙和2 mmol/L草酸处理,以及硅酸钙和2 mmol/L乙酸处理对磷在棕壤中的吸附量最大,均为526 mg/kg;硅酸钙和2 mmol/L柠檬酸处理对磷在棕壤中的解吸量及解吸率最大。因此,硅酸钙+2 mmol/L柠檬酸处理活化棕壤中磷的能力最强。Laboratory experiments with different kinds of treatments on texted brown soil,namely original soil＋ calcium silicate （CaSiO3 ）,original soil ＋2 mmol /L citric acid ＋CaSiO3 ,original soil ＋2 mmol /L ace-tic acid ＋CaSiO3 and original soil ＋2 mmol /L oxalic acid ＋CaSiO3 ,were conducted to investigate the char-acteristics of soil phosphorus （P）adsorption and desorption in the presence of organic acid and silicon fertiliz-er by Langmuir equation fittings.The OECD Guideline106 batch equilibrium method was used for adsorption and desorption experiments.Results showed that the brown soil P adsorption fitted Langmuir models better. The soil added calcium silicate and 2 mmol /L acetic and oxalic acids treatments had the maximums adsorbed P,with the maximum adsorption capacities of 526 mg /kg.The soil with calcium silicate and 2 mmol /L citric acid treatment had the greatest desorption rate of P.Therefore,the soil added calcium silicate and 2 mmol /L citric acid treatment had the strongest activation ability and supply capacity of P.

关 键 词：有机酸 硅 土壤磷 吸附 解吸 

分 类 号：S153[农业科学—土壤学]