Study On Dynamic Mechanism Of Landscape Evolution Of Luoyu River In The Piedmont Of North Qinling Mountains

In recent years,Zhouzhi County starts a 18 km tourism economic belt project named Shasha River,it will seriously damage the ecological environment of the Luoyu River watershed in the piedmont of north Qinling Mountains.The Luoyu River watershed reflects the history of natural landscape evolution,cultural landscape evolution and the evolution of living environment in the small watershed of the piedmont of north Qinling Mountains,but the existing research rarely involves an in-depth analysis of the internal mechanism of the evolution of river ecological environment.In order to solve the sharp contradiction between ecological environment protection and economic development of the Luoyu River in the piedmont of north Qinling Mountains,,this paper explores the intrinsic mechanism of river ecological environment evolution that causes the change of space-time pattern from the perspective of landscape evolution,and establishes the spacetime model of " driving-status-responsing-feedback ".The model helps Luoyu River development not only meets the tourism needs of contemporary people,but also does not destroy the ecological environment of the piedmont of north Qinling Mountains.The main content of this study is divided into the following four points.Firstly,it proposes the theoretical basis and analytical framework.Based on the in-depth analysis of the connotation of "mechanism" and "landscape evolution mechanism",combined with the landscape pattern-process-dynamic theory,the "driving-status-responsing-feedback" space-time model for studying landscape evolution is proposed.According to this model,the analytical framework and the technical route of the study on landscape evolution of Luoyu River are proposed in combination with the current situation of the Luoyu River system(Chapter 2).Secondly,it divides several space-time stages of Luoyu River watershed.According to the space-time characteristics of Luoyu River,Luoyu River watershed is divided into three historical periods: generation stage,development stage and disturbance stage,and three characteristic sections——mountain section,plain section and Water Street section(Chapter 3).Thirdly,it analyzes the driving force of Luoyu River landscape evolution.On the basis of divided space-time stages,it finds out the driving factors that cause the change of landscape pattern and its impact on the change of Luoyu River historical landscape pattern,and diagnose the related problems of the current situation of Luoyu River.(Chapter 4).Lastly,it analyzes the dynamic mechanism of landscape evolution of Luoyu River.It identifies the evolution law between the main driving factors of the landscape pattern evolution and the main landscape elements that affect the landscape evolution,and establishes the development trend graph of the main driving factors and partial changes of the landscape pattern.Based on this trend,the landscape evolution scenarios will be forecasted when the current driving factors act on the current landscape pattern.According to the forecasted results and the possible impact of the historical landscape pattern changes,the ecological development strategy of Luoyu River is given.Based on the study of the change of historical landscape pattern,this paper summarizes the evolution law of landscape pattern under the action of driving factors,and simulates the change of landscape pattern of Luoyu River.According to this law,and gives the ecological development strategy based on the possible influence,and creates 18 km Shasha River for the Zhouzhi County government(Chapter 5).The main conclusions of this paper are as follows.Firstly,a research framework based on historical analysis is put forword.Secondly,the evolution law between the main driving factors and the changes of landscape patches and corridors is established,and the evolution of landscape pattern of Luoyu River is simulated under the driving factors of policy,economy and population growth.Lastly,combined with the influence of historical landscape pattern evolution,the ecological development strategy of Luoyu River is given,which provides theoretical support and development suggestions for Zhouzhi County government to build the Shasha River project of 18 km economic belt.