Abstract:It is China’s significant means about the construction of well-facilitated farmland which stabilize agricultural production and ensure national food security. The natural quality condition and spatial stability of farmland are the important foundation on well-facilitated farmland construction. At present, the study about well-facilitated farmland emphasizes the natural quality of farmland, there is little research on the stability of spatial layout. It was occupied after the well-facilitated farmland was built, resulting in great waste. Therefore, it should be considered not only the natural endowments of farmland, but also the stability of its spatial layout about the well-facilitated farmland construction under the background of sustained and rapid socioeconomic development. An empirical research was conducted in Xinzheng City to study spatial stability evaluation of well-facilitated farmland. In order to further improve the permanent stability of the well-facilitated farmland construction projects, the index system was established from different aspects of locational conditions of farmland, its convenience degree, land and urban plan constraint and ecology control, totally 10 indicators were selected during the evaluation. The results showed that the spatial stability level of well-facilitated farmland construction in Xinzheng City obtained by using nichefitness model was consistent with the results of field investigation, and the validity of the model was verified. The key factors restricting of wellfacilitated farmland space can be reflected perfectly, at the same time the limitation of the subjective empowerment in current evaluation model can be avoided. The theory provided a new method, which could extend the application range of the theory of ecological niche;according to the spatial stability suitability index, the spatial stability of well-facilitated farmland in Xinzheng City was divided into four grades: stability, relatively stability, relatively unstability and unstability, and 28989.64hm2 of the farmland was stable farmland, accounting for 53.52% of the city’s farmland;9075.89hm2 of the farmland was relatively stable farmland, accounting for 16.76% of the city’s farmland;the relatively unstable and unstable farmland was 16102.4hm2, accounting for 29.72% of the city’s farmland. The grade of stability objectively reflected the possibility of farmland being occupied by construction and being destroyed by ecology, therefore, in order to ensure the permanent stability of the farmland, the wellfacilitated farmland construction projects should be arranged in the stable region and the relatively stable region;from the spatial distribution, the farmland stability in the west and south was significantly higher than that in the north and east. The regions with poor spatial stability were mainly divided into urban areas, towns, industrial cluster areas and both sides of the road areas. With the development of the air harbour area, the stability of space in the eastern region would be decreased. The research results objectively reflected the spatial stability of farmland in different areas of Xinzheng City, which was in line with local reality. It can provide a scientific basis for the construction of well-facilitated farmland and the compilation of a new round of land consolidation planning.
