Study On The Protection Of Pass Historic Towns From The Perspective Of Geo-ecological Environment

China has a vast territory,with mountains and rivers all over the country.It is easy to be a strategic place for mountains and rivers to be in danger,thus the pass is born.The ancient pass has the functions of military defense,tariff collection,trade circulation,etc.The historical town of pass type is based on the pass,and the formation and evolution of town highly depend on its geo-ecological environment.As a special type of historical town,it presents the town pattern and cultural characteristics different from the traditional historical town.However,due to the complex background conditions and the excessive intervention of human activities in the process of urban development,many irreversible damages have been caused to the overall environment of the pass historical town,which further increases the difficulty of its protection.Based on the current situation of the protection of the pass historical towns,this paper attempts to discuss the composition of the geo-ecological environment system of the pass historical towns and the internal correlation characteristics and interactive response relationship of each element of the system from the perspective of geo-ecology and urban-rural planning,so as to build the protection strategy system of the pass historical towns from the perspective of the geoecological environment.First of all,this paper summarizes the relevant theories and practices of the historical town protection,abstracts the key points of the practice of the pass historical town protection,and constructs the research scheme and technical route from the perspective of the interdisciplinary of geo-ecology and urban-rural planning.Then,the paper discusses and analyzes the elements,characteristics and other related theoretical connotations of the geo-ecological environment as well as the evolution process and value composition of the pass historical town,condenses the particularity and existing problems of the geoecological environment of the pass historical town,and discusses the applicability of the geo-ecological environment theory in the research of the protection of the pass historical town.Secondly,the paper expounds the relationship between the elements of the geoecological environment system of the pass historical town and the interaction of each subsystem.In terms of constituent elements,the geo-ecological environment system of pass historical town is mainly composed of natural geo-ecological environment and artificial geo-ecological environment;among them,natural geo-ecological environment elements include geological environment factors and ecological environment factors,and artificial geo-ecological environment elements include social environment factors and material space factors.There are multi-dimensional interactive relations among the subsystems of the pass historical town geo-ecological environment system,such as support and guidance,constraint and stress.Based on the interactive relationship,this paper puts forward the protection content of pass historical towns from the perspective of geo-ecological environment,and takes it as a logical starting point,and puts forward and constructs the protection strategy system of pass historical towns from the perspective of geo-ecological environment.Finally,a typical pass type historical town,Feixianguan Town,Lushan County,Sichuan Province,is taken as an example,through the systematic analysis of its historical evolution,social and economic development and other data,based on the theoretical framework of geo-ecological environment,refining the elements of its geo-ecological environment,summarizing the geo-ecological environment characteristics of Feixianguan town and the practical problems faced by its urban protection,according to the protection content of the pass historical town and the actual demand of Feixianguan town from the perspective of geological ecological environment,the protection strategy of Feixianguan historical town is put forward according to local conditions.According to the protection content of the pass historical town and the actual demand of Feixianguan Town,the protection strategy of Feixianguan historical town is put forward according to the local conditions.