The development of rapid urbanization exerts influence in arable land and also deeply affects transformation of its functions, especially in the suburb of metropolises. Using Beijing as a case study, this paper establishes an evaluation index system of arable land functions, then standardizes data with extreme difference value method and determines index weights with the AHP method. Finally, we use weight sum method to calculate function values. The main conclusions include: (1) Production, ecological, cultural and social functions in per unit area of arable land were enhanced in almost all districts during the period 2004-2011. The spatial differences show that: production and social functions in outer suburban plain areas were higher than those in outer suburban mountain areas and inner suburban districts, ecological function in outer suburban plain areas was higher than that in outer suburban mountain areas, and cultural function in inner suburban districts was higher than that in outer ones. (2) The production functions of grain, vegetables and melons in outer suburban plain areas were all stronger, but the agricultural pollution in these areas was more serious. In addtion, influenced by distance from city center, the demand of cultural function in inner suburban areas was higher than that in outer suburban districts. (3) The total function of arable land was enhanced in most districts during the period 2004-2011. Similarly, influenced by terrain condition and central economic radiation, the total function of arable land in the outer suburban plain areas was stronger than that of other districts. (4) According to the proportion of total function, arable land can be divided into four categories: production type (outer suburban plain areas), ecological type (inner suburban areas), cultural type (Fengtai and Mentougou districts), and social type (outer suburban mountainous areas).
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