Directed Graph based formulation of land resource security adjustment and control

Land resource security has come to be a popular issue, and the researches mainly focus on static evaluation of the level of land resource security. But the growing lack of land resource caused by various factors requests us turning our researches on land resource security to dynamic adjustment and control urgently. This paper describes a specific directed graph model on which the model of land resource security adjustment and control can be built. The core idea of this paper is applying the visuality, the clearness and the convenience of directed graph into the process of land resource security adjustment and control. At last, we develop program to visual the directed graph model and realize the method of dynamic adjustment which let the decision-maker control the level of land resource security easily.