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采用四因素二次通用旋转组合回归设计方法,对尿素在土壤中的水解速率与土壤含水量、土壤温度、培养时间、尿素浓度的关系及各因子之间的交互作用进行了研究。建立了尿素水解速率与四因素的回归模型。对回归模型进行分析的结果表明:(1)土壤含水量、土壤温度、培养时间和尿素浓度与尿素水解速率呈二次回归关系;(2)对尿素水解速率影响大小的顺序为培养时间>尿素浓度>土壤温度>土壤含水量;(3)各影响因子之间存在着显著的交互作用。
The quadratic generalized rotary combination regression method was used to study the relationship between the hydrolysis rate of urea and soil moisture content, soil temperature, incubation time, urea concentration and the interaction between various factors. A regression model of urea hydrolysis rate and four factors was established. The results of regression analysis showed that: (1) The soil moisture, soil temperature, incubation time and urea concentration showed a quadratic regression relationship with the rate of urea hydrolysis; (2) The order of the effect on the rate of urea hydrolysis was culture time> urea Concentration> soil temperature> soil moisture content; and (3) there is a significant interaction between the various influencing factors.