Discussion of Ancient Villages' Symbiosis Evolution Model Based on Symbiosis Theory
运用生态学共生理论，构建古村落共生系统，分析其演化模型特征与优化，提出整合对称互惠是发展空间，并讨论三种过渡类型及不同时期的驱动机制。
Based on analysis of ancient villages' multi-stakeholders, the essay employs symbiosis theory from ecology,establishes ancient villages' symbiotic unit and its main parameter and interface, accordingly constructs ancient villages' symbiosis system, analyses features and optimizations of symbiosis evolution model, puts forward that integration and symmetrical mutualism are the development space of ancient villages' symbiosis system. At the same time, the essay discusses three transitional types during symbiosis evolution system development, including residence- leading type,protection- leading type, and exploitation- leading type. During different evolution periods, the driving mechanism that plays leading role is different; therefore, the evolution model is different. According to time series and evolution relations,ancient villages' space evolution is divided into three periods: primary period, middle period and advanced period.During primary period, the transitional type is residence-leading model, and the leading driving force is natural evolution power; during middle period, the transitional type is protection- leading model, and the leading driving forces are government intervention power and market economy impulse power; during advanced period, the transitional type is multi- stakeholders' evolution model, and the leading driving forces are government regulation power and harmonious development power.