作物磷素养分的动态模拟

Dynamic simulation of phosphorus nutrient in crop-soil system

基于养分平衡原理 ,分别建立了土壤有机磷与有机肥分解磷的释放、土壤有效磷吸附的动态模型 ,用Langmuir方程描述土壤吸附磷量与土壤溶液磷浓度的关系 ,建立了植株临界磷浓度与生理发育时间的关系模型 ,以及基于生长潜在需要和土壤水溶性磷浓度限制的作物磷素吸收动态模型。检验结果表明 ,模型对小麦植株含磷率的动态变化有较好的预测效果。

The dynamic simulation models of phosphorus nutrient in crop-soil system were developed in this paper.In the models of phosphorus dynamics,maximum phosphorus absorption capacities were estimated with the concentrations of metal oxides in acid soils and with the clay percentages in other types of soils.The relationship between total available phosphorus and the equilibrium solution phosphorus concentrations in soil was described with the Langmuir function.The functional relations of above-ground critical phosphorus concentrations to PDT were established.The models were tested by phosphorus concentrations in wheat plants,indicating satisfactory agreements to the experimental data.