黄腐酸对黄土性土壤磷吸附解吸动力学性质的影响

The Effect of Fuvic Acid on the Kinetic Characteristics of H_2PO_4￣(-1)Absorption and Desorption in Loessial Soil

采用连续液流法研究了黄腐酸处理对５种黄土性土壤Ｈ＿２ＰＯ＿４￣（－１）吸附、解吸动力学性质及有效性的影响。结果表明：①黄腐酸处理对Ｈ＿２ＰＯ＿４￣（－１）吸附、解吸动力学模型的拟合性无影响，但能使Ｈ＿２ＰＯ＿４￣（－１）的吸附速度及吸附量分别降低１６．７％～６６．７％及１５．３％～６５．４％，解吸速度及解吸量分别增加１４．３％～９４．４％及１０．８％～８１．４％；②黄腐酸处理能使磷的有效系数降低３８．３％～７２．０％，Ｈ＿２ＰＯ＿４￣（－１）的有效性大幅度提高。黄腐酸对黄土性土壤Ｈ＿２ＰＯ＿４￣（－１）有明显的活化作用。

The effect of fuvic acid(FA)on the kinetic cbaracteristics of H_2PO_4￣(-1) ab-sorption-desorption and the H_2PO_4￣(-1) availability in loessial soil was studied by using thecontinuotis fluid flow method.The results of the kinetic models was not affected by theFA treatment,but the velocity and capacity of the H_2PO_4￣(-1) absorbing decreased by16.7%～66.7%and 15.3%～65.4%,respectively.The H_2PO_4￣(-1) desorbing velocity andcapacity increased by 14.3%～94.4%and 10.8%～81.4%,respectively.The availablecoefficients of H_2PO_4￣(-1) decreased by 38.3%～72.0% after the FA treartment as well.