沙漠化是在一定的自然条件作用下,由于人类在开发利用自然资源中,违背了自然规律,进行了不合理的经济活动,致使具有绿茵的地区,产生了类似沙漠或沙地的环境变化,同时呈现出了沙漠化土地,这种环境衰变的过程,我们通称为沙漠化过程。

The phenomena of desertification appears widely in the Northeast of our country. It causes the sharp reduction of biomass of land and the decline of productive poten-tialitives, and even the loss of applicable land resources. Therefore, the investigation of the process of desertification is not only of great theoretical value, but also of practi-cal significance to prevent the occurance of the phenomena of desertification.We try to abstract and summarize the process of desertification, and describe the phenomena of desertification by means of mathematical representation. We divide the process of desertification in a certain area into three states: the stably good farmland state, unstably critical state of desertification and stable desert state. Furthermore, we consider that there is a sudden change transected from the critical state to the desert state or from the critical state to the stable good farmland state. For this reason, we can adopt this mathematical form of cusp catastrophe model to link up these three statesof desertification, and use some new concepts and methods to describe and explain the phenomena of desertification.