中文摘要：

用耗散结构理论分析了荒漠化系统的不同演变状态,指出决定荒漠化状态演变的4个熵阀值和荒漠化发展中的2次突变,圈定出荒漠化良性发展的区间,在此基础上构建了荒漠化动力系统的熵理论模式.该模式为进一步量化分析荒漠化以及进行荒漠化的防治提供理论依据.

英文摘要：

Desertification is one of the most pressing eco-environmental problems in the world. The current study on the desertification is only confined to the status of macro investigation and description. Quantitative means is becoming necessary. The dissipative structure theory is becoming a bridge tool to study the desertification quantitatively. The dissipative structure theory to analysis the different evolution state of desertification system is applied. It points out that the four entropy thresholds are key events for the desertification system to develop, which determinate four evolutions of the system state. Specially, the threshold 2 and 3 are become key borders for 2 mutations. The nonlinear interval of the non-equilibrium state is a vital interval. The system at the interval will break through the threshold 2 and mutate to the equilibrium state by a improper entropy disturbance. The non-equilibrium state and the nonlinear interval of the non-equilibrium state are benign, and the non-equilibrium nuclear and the linear interval of the non-equilibrium are stable benign state. On the above basis of the job, the model of the dynamic system of desertification is established. The productivity of the desertification system acts as the state parameter of the model, which develops at the Logistic growth curve. The quantification law of the system entropy is established at the base. At last, the pattern of entropy theory on desertification dynamic system is modeled. The model will be of help to further discussion about the desertification dynamic system, and provide theory for its control.