中国耕地非农化对经济增长贡献的地区差异分析

现阶段中国耕地非农化对经济增长贡献存在地区差异，掌握差异的主要来源和变化趋势有利于耕地非农化指标的高效调配，促进地区经济增长的协调发展。利用1989~2001年我国东、中、西部建设用地占用耕地面积和国内生产总值的分省数据，测算了以建设用地占用耕地面积和GDP增量为对象的基尼系数、加权变异系数以及泰尔指数等指标，并对泰尔指数进行因素分解得到差异的主要来源和变化趋势。结果表明：三类地区内部省际差异是总体差异的主要来源，其中东部内部差异对总体差异贡献增大、中部减小、西部有先增大后减小趋势。鉴于此，从促进资源的高效利用和保护地区间公平发展环境的角度出发，耕地非农化指标调控的重点在于三类地区各自内部省份之间的调剂。

DISPARITY OF FARMLAND CONVERSION TO REGIONAL ECONOMIC PERFORMANCE IN CHINA

The disparity of farmland conversion to regional economic growth exists in China. To analyze the origin and the tendency of the disparity, this paper employs the Gini coefficient, weighted variation coefficient and Theil index to measure the contribution of farmland conversion to local GDP in the three main regions of China with provincial data from 1989 to 2001. The Theil index has been decomposed for further studying the main origin of the disparity. The result shows that the disparity in each region is the main source of the disparity at national level. In addition, it is revealed that the contribution of east region is increasing gradually, while that of the middle part is decreasing, and the west region's contribution is increasing gradually before 1999, then decreasing. The result implies that the key point of government intervention in allocating farmland conversion quota is to improve allocation efficiency in each region, but not between regions,for the effective use of resources, and maintain and of an equitable environment for the economic development in the whole country.