农业系统中磷肥残效及磷循环研究　Ⅳ．农业系统磷循环的一个简单模型及其验证

Residual effect of phosphorus fertilizer and phosphorus recycling in a farming system Ⅳ.A simple phosphorus recycling model in a farming system and its test

根据辽西易旱区碳酸盐褐土上进行的６年Ｐ肥试验资料，建立和验证了一个简化的农业系统Ｐ循环模型．对４种施Ｐ对策进行长时间尺度的模拟预测表明，６年三次大剂量施Ｐ并辅以每年有机肥还田的施Ｐ模式固土壤有效Ｐ水平和施Ｐ利用率较高而优于其它模式．

A simple phosphorus recycling model is established and validated based on a six years field experiment conducted on a calsic cinnamon soil in West Liaoning. The long-term simulated prediction of four ways of applying phosphorus fertilizer shows that the applying P every six years with high rate and with pig manure recycled each year is better than other ways of P fertilization from the view of higher crop yield and soil available P level and greater recovery rate of applied P.