试论自然地理系统中的反馈机制

ON THE FEEDBACK MECHANISM IN THE PHYSICAL GEOSYSTEM

Physical geosystem isainformation feedback system in which iuformaton feedback arganization exists Hawever,the interaction of geofactors in Physical geosgstem forms multicausal feedback loops and Causal relation really portrys the internal relation of physical geosystem, At first,therefore,we must clarrify the causal feedback relation in the physical yeosystem in order to study its structure,fnnction and dynamic process of evolution. This paper applys the theory of system dynamics to discuss the component,types and attribute of causal feedback loops in the physi- cal geosystem.positive Causal feedback loops in the physical geosystem have the self-intensive daracteristic that break physical geosystem away from initial state,so it is the causl of not inly good but also vicious cviculation of physical geosysten.Negative causal feedback loops in the physical geosystem have the behavior of self-regulation. physical geosystem is of ten composed of several positive and negative causal feedback loops of which coordinative action make organic and inorganic nature and human form a whole of nature.