The Ecological Risk Assessments And Spatial Strategies Of "Areal Type Of Yukou" On The Piedmont Of North Qinling Mountains

The key to solve the ecological risk on the piedmont of north Qinling Mountains is to apply a series of spatial strategies to control the ecological risk on the basis of regional ecological risk assessments.“Areal Type of Yukou ” on the piedmont of north Qinling Mountains(proluvial fan unit)is the basic landform unit composed of alluvial plain of North Qinling Mountains.It is an ecotone between Qinling Mountains mountain and Weihe plain,and its ecological security is very important for Qinling Mountains and Guanzhong plain.The unique natural conditions and the long-term development and construction of mankind make the region face the threat of natural disasters,human activities and environmental pollution,which threaten the ecological risks.It is of great practical significance to explore the ecological risk assessment system and the corresponding spatial strategy for this region.The purpose of regional ecological risk assessment is to provide theoretical and technical support for ecological risk control and protection of regional ecological security.Although the generation and development of regional ecological risk assessment are based on management needs,the risk avoidance is more based on risk zoning in the planning and design practice.The mechanism of ecological risk is often neglected.The exploration of ecological risk control in space is not enough.Because of this background,the areal type of Taiping yukou as a representative of “Areal Type of Yukou ” on the piedmont of north Qinling Mountains,conduct research on regional ecological risk assessments and spatial strategies.Construct an assessment system for ecological risk in the study area,and explore the spatial ways to reduce the ecologicalrisk in the study area.The thesis is divided into seven chapters,from theory to practice.The first chapter,the background,purpose,significance,object,summary,method,content and logical framework of the research are integrated and combed.The second chapter,by comparing the landscape ecological assessment tools,evaluation paradigms and evaluation methods,the characteristics of regional ecological risk assessment are summarized.Define the related concepts,analyze the risk generating mechanism,and put forward the evaluation system.The third chapter,from the three aspects of location,ecological environment and humanistic economy,the general situation of the study area is combed and the ecological risk problems are pointed out.The fourth chapter,the ecological risk assessment scale,evaluation unit,risk receptor,evaluation end point and main risk source were analyzed.The fifth chapters,in view of the main risk sources in the study area,the spatial characteristics are analyzed from three aspects: the ecological risk,the environmental fragility and the ecological value.The results of single risk source evaluation are obtained by superposition of matrices,and then the weighted overlap is used to obtain comprehensive ecological risk assessment.The sixth chapter,based on the evaluation results,ecological planning,guidance and corresponding spatial strategies are put forward.The typical areas of the three risks are analyzed,and the specific spatial strategies are put forward,and then regional spatial strategies of various risks are put forward too.The seventh chapter,it is a brief summary and conclusions of this study.This part summarizes the ecological risk assessment system and spatial strategies of this paper.Here are some of the innovations of this article.(1)Relevant theory arrangement.The characteristics of regional ecological risk assessments are summarized.It summarized the research progress and related concepts,and provided the theoretical basis for the construction of ecological risk assessment system suitable for the study area.(2)The mechanisms underlying ecological risk are analyzed.“Areal Type of Yukou” on Taiping Yu is a typical case of“Areal Type of Yukou ”on the piedmont of north Qinling Mountains.The ecological risk of “Areal Type of Yukou” on Taiping Yu is described from three aspects: the risk of ecological risk,the fragility of environment and the ecological value of environment.(3)The spatial strategies were proposed.Onthe basis of the results of ecological risk assessment,the planning guidance and space strategies suitable for “Areal Type of Yukou” on Taiping Yu are put forward.Provide the basis for further exploration of universal space strategies in “Areal Type of Yukou”on the piedmont of north Qinling Mountains regional protection and utilization.