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采用连续液流法研究了陕西省7种土壤吸附H_2PO_4~(-1)的动力学性质。结果表明:①供试土壤的吸磷过程存在快、中、慢3个反应阶段,所需时间分别为20～30、20～55及40～100 min,吸磷量分别占吸磷总量的50％～80％、8％～62％及5％～40％;②Elovich方程对H_2PO_4~(-1)吸附过程拟合最优,拟合最差的一级反应方程对吸附过程中的速率变化比较“敏感”,可用于快、中、慢反应阶段划分和吸附机理深入研究;③温度和粘粒含量、CEC等土壤性质对H_2PO_4~(-1)吸附速度和吸附量有显著影响;④H_2PO_4~(-1)吸附速度可作为土壤吸磷能力评价的动力学指标。
The kinetic properties of H_2PO_4 ~ (-1) adsorption on seven soils in Shaanxi Province were studied by continuous flow method. The results showed as follows: ① There are three reaction stages of phosphorus uptake in the soils, which take 20-30, 20-55 and 40-100 min, respectively, and P uptake respectively accounts for the total phosphorus uptake 50% ~ 80%, 8% ~ 62% and 5% ~ 40%. ②Elovich equation is the best for the H_2PO_4 ~ (-1) adsorption process. The worst fitting first- More sensitive, can be used for the division of fast, medium and slow reaction stages and further study of adsorption mechanism; ③The temperature and clay content, CEC and other soil properties have a significant impact on the adsorption rate and adsorption capacity of H 2 PO 4 -1; ④H 2 PO 4 ~ (-1) adsorption rate can be used as a kinetic index to evaluate phosphorus uptake capacity of soil.