Study On Well-facilitated Farmland Construction In Karst Area

Well-facilitated farmland is the essence of arable land,and it is also an important resource to ensure food security in China.The construction of well-facilitated farmland can promote the increase of grain output and the improvement of grain quality.China is the country with the largest Karst distribution area in the world.The construction of wellfacilitated farmland in Karst area can enhance the security of food supply in China.However,there are few relevant studies on well-facilitated farmland in karst areas at present.Studying the construction of well-facilitated farmland in this area is conducive to increasing the local grain yield,which will further complement and perfect the theoretical system of well-facilitated farmland as well as consolidate the achievements of poverty alleviation.Township is the implementation unit of the construction of high standard farmland.This article selects Dacai Township which is the typical karst landform as the study area.It bases on the definition of a high standard farmland and the special characteristics of karst landform to construct the evaluation index system.We have made a comprehensive evaluation of the construction of high standard farmland in Dacai Township and also made the division of potential construction area as well as the arrangement of construction time sequence by using the integrated use of analytic hierarchy process(AHP),the entropy weight method,the approximation to the ideal point method,the coupling coordination degree model,the analysis of the hot spots and other research methods and using Arc GIS software spatial analysis,statistical query and its other functions.The conclusions of this paper are as follows:1.Build the evaluation index system of high standard farmland construction in karst region.This paper evaluates the potential of well-facilitated farmland construction from the suitability and stability of cultivated land.Suitability was evaluated from three perspectives of natural endowment,infrastructure and landscape form,while stability was evaluated from three perspectives of location condition,cultivated land character and planning control.2.Delimitate the potential areas for well-facilitated farmland construction.Based on the coupling coordination degree model and combined with the suitability and stability of the study area of the construction of high standard farmland,the study has determined the potential areas of high standard farmland.The potential areas are divided into high potential area(Ⅰ level),medium potential area(Ⅱ level),low potential area(Ⅲ level),and non-potential area(Ⅳ level).Among them,the Ⅰ、Ⅱ level areas are more widely distributed,which are mainly distributed in the far area from the town due to the influence of spatial stability.The Ⅰ level areas are mainly distributed in Dacai Community,Tongjin Village,Dama Village,Chonglou Village,etc.The Ⅲ.Ⅳ level areas are mostly distributed in the urban and highway expansion area due to the great influence of urban expansion.3.Arrange the time sequence of well-facilitated farmland construction.This paper has further analyzed the construction time sequence and determined the areas of the 3near-term,medium-term and long-term construction projects.Among them,the area of near-term construction projects is relatively large,with a total area of 327.44 hectares,about 13% of the total arable land area,which takes a large proportion and indicates that the construction of well-facilitated farmland in Dacai Township has a great potential.The areas of near-term construction projects are mainly located in the west of Chonglou Village and Dama Village,and the contents of the near-term construction are mainly about rebuilding of the original ditches and roads.4.From a general view,Dacai Township has a great potential for well-facilitated farmland construction.Its good natural conditions,perfect infrastructure,good soil texture,rich irrigation and drainage systems,and less affected by urban development indicate that the suitability and stability of this construction area are pretty good.The results of this study can provide certain theoretical basis and practical significance for the construction of well-facilitated farmland in karst landform area.