Research On Permanent Prime Farmland Demarcated In Urban Fringe Based On LESA System

People much less, the cultivated land resource scarcity is the basic national conditions of our country. To meet the requirements of national 1.8 billion mu of arable land red line, we are gradually deepening degree of attention to the protection of basic farmland. New revision of general land use planning (2006-2020) definitely require permanent basic farmland demarcated, the provinces, autonomous regions and municipalities directly under the first super city from more than 5 million people, the provincial capital city, according to the town from big to small, space, from far and near, cultivated land quality and soil fertility level from high to low order, orderly delimit working steadily, and to existing easy quality of cultivated land occupied in a priority as permanent basic farmland.(1) At present our country scholars for the study of the edge of the city area. Many involving the evolution law of the edge of the city area, the landscape pattern change and land use dynamic research, not for the edge of the city zone of permanent basic farmland demarcated research. Studies of basic farmland demarcated from the view point of different landscape types such as mountains, plains, from the achievements of farmland classification, land evaluation, GIS, spatial clustering, as well as the capacity calculation and so on, in the theoretical and practical study on basic farmland demarcated. But these research focuses more on the quality of cultivated land, ignored the role of social and economic conditions in the basic farmland demarcated.(2)Considering the special geographical position of the edge of the city area, as an object of permanent basic farmland demarcated is different from the general area, farmland natural quality is better. But vulnerable to urban sprawl and rural agglomeration effect, is a highly sensitive areas. LESA method, therefore, to introduce the United States, from the cultivated land quality LE and site (social and economic conditions) of SA comprehensive delimit the urban fringe area of permanent basic farmland, to safeguard cultivated land quality is stable.(3)In this study, fringe Shenyang Shenbei as the study area delineated permanent basic farmland, Shenbei is highly sensitive area, the larger the influence of urbanization and rural agglomeration. LESA method introduced in the US key consideration site conditions, respectively arable land quality assessment and evaluation of site conditions, on this basis, to build urban fringe permanent demarcation of basic farmland index system, the permanent demarcation of basic farmland in urban fringe.16 indicators were selected to build the permanent demarcation of basic farmland Index System:to reflect the quality of the natural conditions and infrastructure conditions 8 LE indicators and reflect regional conditions, farming conditions and policy conditions 8 SA indicators. Shenbei LE and SA jointly decided to designate outcome of the permanent basic farmland. Since the urban fringe special geographical location, overall development advantage, will inevitably bring about rapid economic development, Shenbei located in the northern suburb of Shenyang City, the terrain is relatively flat, although LE superior, but by the economic development of urban construction, rural agglomeration impact larger, SA dominant factor, scaling factor LE and SA is 2:3. This study delineated one, two, three comprehensive evaluation of the results of the best arable land could be used as a permanent long-term protection of basic farmland, an area of 35510.50hm2, accounting for 77.94%of the total area of arable plains.(4)Existing basic farmland in delineating more under the provisions "Land Management Law" and "Basic Farmland Protection Regulations," except that the evaluation unit corresponding evaluation scores are arranged in descending order, but this study takes into account economic Necessity of construction and urban construction, the permanent demarcation of basic farmland quality and stability, to ensure both the Alleged LE, but also has good SA, the economic impact is small, can play to prevent rural aggregation, inhibition of unlimited expansion of the big cities role. In line with the national policy for the protection of basic farmland, and large cities, capital cities priority requirements delineated permanent basic farmland, urban fringe that is in line with the expansion of the city and the city side impact, the socio-economic function of the progressive trend of higher land productivity functions.