| Farmland conversion is a necessary phenomenon during the process of economic development. Since the occurrence of externality of land use, farmland conversion must be under the control of government. However, the control of government should be conducted on the regulations of farmland conversion and spatial efficiency variance synthetically and objectively. Based on the analysis for farmland conversion situation in chegdu city, analyses on the farmland conversion's contribution to the economy development by production function(C-D), historic variation, measurement on the spatial efficiency of farmland conversion in different district in ChengDu city were evaluated in this article. Combined with results, We analyzed the causes ascribed to the variation of efficiency. We hold up the suggestions, can be used as the reference for the sustainable development of land resources and the policy establishment in Chengdu city, improvement of farmland conversion efficiency and the control of farmland conversion reasonably.The results showed:1) The mean contributive rate farmland's conversion to economic development was18.23 % from 1997 to 2005. The highest rate reached 23.68%, the lowest rate reached 12.47%, which demonstrate that farmland conversion is an important resource contributing to the economic development in chengdu city. From the perspective of different period, the average contribution rate of farmland conversion to economic development from 1997 to 1999, which increased by 18.87% from 2000 to 2002. The average contribution rate of farmland conversion to economic development was 21.28% from 2000 to 2002. That demonstrated that the averaged contributive rate of farmland conversion's efficiency on economic development in Cheng Du city was significantly higer than that in mid-late 90's.We can anticipate that the rate increase along with the development of economy of Cheng Du city.2,) Constructive land in regionⅠrepresented the highest marginal output, followed byregionⅡ, regionⅢ, regionⅣ, reached 244.88 ten thousand/ha, 70.57 ten thousand/ha, 61.15 ten thousand/ha, 47.90 ten thousand/ha respectively. Significant variation was found in marginal output of constructive land in different areas, regionⅠwas 5.11 times than regionⅣ. The rank of contributive rate of flat land for construction to GDP was represented as flowing order:Ⅰ,Ⅱ,Ⅲ,Ⅳas 48.07%, 27.53%, 17.93%, 7.29% respectively. The rate in regionⅠwas higer than that in other regions was 1.75 times than that in regionⅡ, 2.68 times than that inⅢ, 6.59 times than that in regionⅣ. Contributions of flat land for construction was highest in regionⅠ, reached 26.19 ten thousand /ha, followed by regionⅡ,Ⅲ,Ⅳ, which occupied 56.47%, 40.17%, 27.54% respectively. Consequently, farmland conversion in ChengDu city has not achieved the balance of spatial efficiency.3) Analysis indicated that there have positive correlation between five factors (degree of land market, urbanization level, industrial structure, the level of economy development, relative efficiency of land use) and spatial efficiency of farmland conversion. These factors are main reasons which contribute to differences of land conversion spatial efficiency in chengdu city.Considering the harmonious development of economic development and protection of farmland, based on the analyses above, We suggest:Firstly, controlling farmland conversion reasonably and protecting land resources efficiently. From the perspective of efficiency, during the process of farmland conversion, the supply of farmland available for conversion can be increased in regionⅠ, regionⅡ, regionⅢ. Hence the economy can develop rapidly when the farmland was well protected, especially the limit available farmland resource in Cheng Du city.Secondly, strengthening market match degree of farmland conversion. Increasing the land area for transfering and enhancing the ratio of bidding, auction, listing and so on. Strengthening land market macro-control, ameliorating the land market and related laws and regulation. Increasing management of illegal land transactions, ensure that the land market operates orderly.Thirdly, accelerating the process of urbanization and improves spatial efficiency of agricultural land conversion. Increasing agricultural input, improving the level of agricultural mechanization. Ameliorating industrial structure, transfering rural surplus labor resources. Strengthening training of labor vocational skills, enhancing the proportion of non-farming population.Fourthly, increasing relative efficiency of land use, improving spatial efficiency of agricultural land conversion. Optimizing the industrial structure, increasing the input of unit constructive land, and improves intensive degree of land management. Improving output for the unit of land area, maximizing the contributive rate of farm conversion to the economy development... |
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