Study On The Designation Of High Standard Grainfield Based On LESA Model In Luoshan County

The High Standard Grainfield refers to the high-standard permanent grain field with smooth and fertile farmland,complete farming facilities,qualified personnel and technology,efficient and environmentally friendly farming methods,and high yield and high quality of farming results.Land resource is the core factor of agricultural production,and cultivated land resource is the carrier and guarantee of grain production.The construction of modern agriculture and the improvement of agricultural mechanization and scale require not only high-quality soil conditions,but also the support of transportation,human resources,market and other factors.In Luoshan county of Henan province as an example,this paper on the basis of LESA system principle of the United States,the evaluation index is selected and set based on the main evaluation purpose and the basic data of the research area.The comprehensive evaluation system based on the cultivated land soil quality evaluation and site condition evaluation is constructed by Delphi method and correlation analysis method.The spatial analysis of evaluation results was carried out by means of overlay analysis,buffer analysis and other tools in ArcGIS software,and the High Standard Grainfield construction area was demarcated.The time sequence and work focus of construction tasks were proposed,so as to provide reference and basis for further improving the High Standard Grainfield demarcation.The main results are as follows:(1)The preliminary work of the High Standard Grainfield delineation study clarified the logical mechanism and specific differences between the high-standard grain field and the basic farmland in terms of concept connotation,construction purpose and scope of application,made clear in the designated construction process,not only should consider the production potential of land itself,but should also fully consider the stability of the layout,follow to ensure the safety of food supply high standard farmland construction purposes,the establishment of a high standard farmland demarcated theory system.(2)The comprehensive evaluation system of cultivated land quality composed of soil quality evaluation system and site condition evaluation system is constructed in this paper.The soil quality evaluation part selects the influencing factors from two aspects which can directly reflect the soil quality and the ecological environmental conditions which can directly affect the quality of cultivated land.The site condition evaluation part selects the influencing factors from three aspects which can reflect the social and economic development environment,the cultivated land use environment and the policy stability environment.Using the methods of hierarchical analysis,Delphi and correlation analysis,referring to the grading standards of agricultural land,and taking ArcGIS and SPSS software as the main technical means,the comprehensive evaluation model of cultivated land quality was established: LESA=aLE+bSA.(3)This paper takes Luoshan county,Henan province as the research area,and conducts empirical research and analysis of soil quality evaluation and site condition evaluation.From the perspective of ensuring high and stable yield of cultivated land,the correlation between comprehensive score of cultivated land quality and standard grain yield was determined by establishing regression analysis equation to judge the two parts with different weights.The ratio of a and b was determined to be 4:1,and the comprehensive evaluation model of cultivated land quality in Luoshan county was constructed.The results show that the distribution of cultivated land quality evaluation score in Luoshan county is affected by terrain and other factors and generally decreases from north to south.In addition,the level of cultivated land is also restricted by the location conditions.It declines from both sides of the road and gradually decreases from the county center to remote areas,which reflects the importance of geographical advantages and convenient transportation conditions to improve the income from cultivated land scale.(4)On the basis of the results of comprehensive evaluation of cultivated land quality,this paper delimited high-standard grain and cropland construction areas based on local standards,laws and regulations and the situation of Henan province.With the help of the natural break point method of ArcGIS software,the cultivated land with a comprehensive score of 66.76 can be divided into the core planning area of High Standard Grainfield construction and the optimization and improvement area.The cultivated land in other areas can not meet the requirements of High Standard Grainfields for the time being,and is divided into reserve resource areas and non-suitable delimited areas.The delimited results can not only ensure the permanent stability of High Standard Grainfields,but also meet the land demand for economic construction and development,which is conducive to practicing the sustainable development concept and promoting the development of green agriculture and ecological agriculture.(5)The results of High Standard Grainfield have been further stabilized in the proposed countermeasures for the construction of the zoning and construction model.The site selection and capital investment of High Standard Grainfield should be given priority in the core planning area,and the focus should be on the maintenance of cultivated land quality.In order to make full use of the cultivated land and improve the level of the whole cultivated land,some measures should be taken according to the local conditions.Cultivated land in reserve resource area can be used as general cultivated land or reserved area for construction.Cultivated land that is not suitable for delimited areas can be included into ecological conservation areas.In the near future,multiple ways of agricultural land utilization should be explored,and in the later stage,farmland conversion should be gradually realized,which can not only maximize the potential functions of cultivated land,but also conform to the national high quality and sustainable development of modern agriculture.