Study On The Optimization Strategy Of Landscape Pattern Of Farmland Drainage Pollution Prevention In Ningxia Irrigation Area

The irrigation mode of "large diversion and large discharge" in Ningxia Irrigation Area has led to the increasingly prominent problem of farmland drainage pollution.The Nitrogen and Phosphorus farm chemical residues in farmland have caused water eutrophication after returning into the river,which seriously affects the aquatic ecosystem health of the Yellow River.From the perspective of Landscape Architecture,the characteristics of farmland landscape pattern can play an important role in the prevention of farmland drainage pollution.In this study,Weiqiao Village,Daba Town,Qingtongxia is selected as a representative case.Firstly,the characteristics of farmland landscape pattern in Ningxia Irrigation Area are analyzed.Secondly,the spatial mechanism between farmland landscape pattern and the episode of farmland drainage pollution is revealed.Finally,the optimization strategy of landscape pattern of farmland drainage pollution prevention is proposed from the perspective of Landscape Architecture.The conclusion of this study provides a spatial approaches for rural agricultural pollution abatement in Ningxia,and also provides a reference for the treatment of farmland drainage pollution in similar areas.This paper is divided into six chapters.The first chapter is the introduction,including the research background,object,purpose,significance,method,content and framework.The second chapter summarizes the relevant theoretical and practical research on the optimization strategy of landscape pattern and the optimization method of landscape pattern for farmland drainage pollution prevention and control.It sorts out the research status of landscape "pattern-process" relationship theory,the influence of agricultural landscape on stream ecosystem,and the optimization strategy of landscape pattern for farmland drainage pollution prevention and control,and extracts the ecological principle to provide a theoretical basis for this study.The third chapter analyzes the current situation of farmland drainage pollution in Weiqiao Village,Daba Town,Qingtongxia,explores the specific causes of farmland drainage pollution in Weiqiao Village,and explains the importance of this study.The fourth chapter analyzes the landscape pattern and landscape process of farmland drainage pollution in Weiqiao Village,Daba Town,Qingtongxia,identifies and extracts landscape units,and evaluates the episode of farmland drainage pollution in Weiqiao Village from the perspective of "source-sink" landscape pattern.Based on the case study,the fifth chapter extracts the spatial control strategy of farmland drainage pollution and classifies the optimization strategy of landscape pattern according to the matching with the "source-flow-sink" landscape units.The sixth chapter summarizes the research contents of the optimization strategy of landscape pattern of farmland drainage pollution prevention in Weiqiao Village,Daba Town,Qingtongxia,and makes research prospects.There are four parts of conclusions in this thesis.Firstly,the relevant space theories and cases of farmland drainage pollution prevention are sorting out.Secondly,it reveals the relationship between the episode of farmland drainage pollution and farmland landscape pattern.Thirdly,the optimization model of farmland drainage pollution prevention landscape pattern is constructed.Finally,the optimization strategy of landscape pattern of farmland drainage pollution prevention is proposed.