Abstract: Asimple 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 Plevel and greater recovery rate of applied P.

Key words: Agroecosystem, Phosphorus recycling, Model, Simulation, vulnerability, drought, danger, integrated risk, disaster prevention and mitigation capacity.