Study On Evolution Characteristics And Optinization Strategies Of Rural Landscape Pattern In Dujiangyan Irrigation Area

As a big agricultural country,China has bred a broad and profound agricultural irrigation civilization.As the carrier of water conservancy projects,irrigated areas have the leading ecological significance in the rural revitalization in the new period.In 2018,the Dujiangyan water conservancy project was included in the world irrigation engineering heritage list.As the main object of "western control" in Chengdu,Dujiangyan has assumed the role of an important ecological barrier in the upper reaches of the Yangtze river and a major water conservation area in the Chengdu plain.The year of 2018 will also be the "year of full implementation" of Chengdu's construction of to be a world garden city.The restoration project of Dujiangyan essential irrigation area and the protection project of Linpan will be promoted rapidly.This paper takes Dujiangyan irrigation area as the research object,takes Juyuan town as an example,takes its remote sensing images in 2008 and 2018 as the basis data,uses ArcGis to make visual interpretation of the landscape pattern of Juyuan town in two periods,and classifies it into five landscape types: building land,road,forest land,water area and farmland.Then,construct the index evaluation system of landscape pattern,With Fragstats,the evolution of landscape pattern in Juyuan town from 2008 to 2018 is analyzed qualitatively and quantitatively.Combined with the socio-economic statistical data and real-time access information of Juyuan town obtained from the survey,the driving types and driving mechanism of natural driving factors and human driving factors of the evolution of landscape pattern from 2008 to 2018 are analyzed by using the analysis function of Arcgis.IDIRISI is used to make the suitability atlas based on the conclusion of the driving factor analysis,combined with the area transfer matrix of landscape type,after accuracy verification,the Ca-Markov model is used to make the first prediction of the landscape pattern of Juyuan town in 2028.The prediction is the landscape pattern that will be formed in the future according to the current development trend.In order to put forward the optimization strategy for the future landscape pattern development of Juyuan town,the landscape pattern index was used to evaluate the first prediction of the landscape pattern in 2028,and the ecological crisis in the future was analyzed,including the problems of highly fragmented landscape pattern,strong human interference,reduced ecological diversity and low degree of connection between landscape types.According to above ecological crisis,the solution strategy was proposed one by one,the driving conditions of the Ca-Markov model were changed,and it is used to simulate the optimal landscape pattern of Juyuan town in 2028 for the second time.Finally,based on the optimized landscape pattern of Juyuan town in 2028,appropriate development models were proposed for the 11 communities of Juyuan town due to the suitability of the land.The research methods and conclusions of this paper will provide important reference for the academic research and engineering practice of the rural landscape pattern in the vast irrigation areas.