Research On Permanent Prime Farmland Demarcated In Lower Liaohe River Plain Based On TOPSIS

The basic farmland is the essence of cultivated land and is related to the national economy and people's livelihood.It is an important guarantee for realizing regional food security.China has always attached great importance to the protection of basic farmland.In order to better protect high-quality farmland,the country has continuously introduced new policies and measures.However,in the situation of strict protection of basic farmland,due to economic construction and urban development,basic farmland delineation and protection have been frequently adjusted,and the basic farmland supplementation has different extents.There are a series of issues such as planning,zeroing,and not drawing.In order to ensure national food security and implement the revitalization of the countryside and promote the construction of ecological civilization,the country has made a strategic plan to delineate permanent basic farmland and implement special protection.To this end,many domestic scholars have conducted a lot of research on the selection of evaluation indicators for arable land,selection of evaluation systems,innovation of evaluation methods,and spatial distribution of basic farmland.However,the existing research needs to further reflect the features and differences of the elements of the natural,use,and location conditions of cultivated land in large-scale landscape areas.At the same time,the index selection and evaluation of permanent basic farmland delineation requires relatively accurate scientific quantitative methods.In this paper,the Liaohe Plain geomorphological area is taken as the object of study.Through the principal component analysis method,the indicators of the nature,utilization,and location conditions of cultivated land delineated by selected permanent basic farmland are screened,and an index evaluation system for permanent basic farmland is constructed.The TOPSIS method is used.The arable land was sorted and partitioned,the limiting factors in each area were analyzed,and the demarcated results were compared with the grading results of arable land quality.Finally,it provides a set of technical methods and systems that can be used for the delineation of permanent basic farmland in the lower reaches of the Liaohe River Plain.1.Through indicator selection,establish an index system of natural,utilization andlocation conditions suitable for plains and geomorphologic regions.The index system constructed removes the condition indicators with low correlation,reflects the condition characteristics of the plains and geomorphological areas,and guarantees the delineation results.Scientific and reasonable.2.Comprehensively consider the natural conditions,utilization conditions,location conditions in three aspects,construct a permanent basic farmland demarcation index system,use TOPSIS method to sort the degree of closeness to the ideal point of the cultivated land spots,the calculated closeness interval is(0.38 ~0.76);Using Kriging interpolation method to interpolate the closeness values,using K-means algorithm to cluster the interpolation results,on this basis,the classification of the cultivated land in the lower reaches of the Liaohe River Plain: key protected areas(0.63 ~ 0.76),General remediation area(0.54~0.63),Ecological conservation area(0.38~0.54).3.After comparative analysis,the natural conditions,utilization conditions,and location conditions of the key protected areas are superior,and they are the priority demarcated areas for permanent basic farmland;the general improvement areas are relatively easy to rectify and effectively improve,despite their disadvantages compared to the key protection areas.Therefore,it is suitable to be designated as a permanent basic farmland.Ecological conservation areas have certain problems due to natural conditions,utilization,and location conditions.It is difficult to rectify and it is not appropriate to designate permanent basic farmland,which can be used as a lower ecological conservation area.In this paper,the key protected areas and general remediation areas are designated as permanent basic farmers,and the delineated area is 310,686.24 ha,accounting for 79.82% of the total cultivated land in the lower Liaohe Plain.4.analysis on limiting factors of each region,and proposes the policy suggestions,explore the path of permanent basic farmland protection,the protection of national food security.Finally for the lower Liaohe plain permanent basic farmland management reference level area without constraints theory and method,we should strengthen the supervision to ensure the implementation of information supervision.The quality of cultivated land;two existing natural conditions,should be targeted to carry out the construction of waterconservancy facilities,strengthen soil improvement suggestions.To carry out the construction of ecological conservation zone three area,increase the intensity of economic compensation and benefit to farmers.