A PRELIMINARY ANALYSIS OF THE PROCESS OF LAND TYPES EVOLUTION
土地类型演替过程浅析——以缙云山为例

The evolution of land types includes two sides: one is space and the other time. For land syslem is an opening matter system, not only matter but also energy exchanges with its surroundings continually. The theory of dissipative structure was used to analyse the evolution process in time and the formation of dissipative structure of land types. The entropy DS of land system includes negative entropy deS and inner entropy diS. That is dS= deS+diS. If diS/dt= - deS/dt>.0, the land types show in stable state, if diS/d t/= - deS/dt, the land types begin to evolve. The evolution of land types is completed through its phase change. Increase of deS of land in the evolution process of land types shows the evolution of land types in good condition, the contrary is in bad condition.Two kinds of the process of land types evolution in the JinYun Mountain were discussed in this paper. One is in natural condition and the other under cultivating. For the latter, the human action is a very important factor in the evolution process of land types, because both diS and deS are affected by human action. The direction and speed are determined by the way of the use of land.The evolution and the dissipative structure of the land system are formed by the, fluctuation in the system. In the use and protection of land, any kind of fluctuation phenomenon must be noticed, especially for the land in unstability.