以江苏省204国道沿线15县(市)组成的典型样带为研究区域,根据农林牧渔业总产值及其增长率、农业产值占地区GDP比重、农业产业结构、农业优势度等多项发展指标,应用统计模型和GIS空间分析方法,研究了改革开放以来样带区农业发展的差异格局。研究结果表明:(1)近30年来样带内各县市农业发展的总体水平差距拉大,农林牧渔业总产值年均增长率呈现出北高南低的格局;(2)农业产值占地区GDP比重普遍下降,尤以苏南三市下降幅度最大,样带内各县市间农业比重的差距明显增大;(3)样带内各县市农业内部结构也发生了巨大的变化,其中种植业比重有所下降,渔业比重有所提高,并且各县市间种植业比重的差距和渔业比重的差距均有明显增大;(4)改革开放以来,样带区农业优势度北高南低的格局得到逐渐强化,苏南三市不具优势,苏北地区优势度最高。

Differences of agricultural development in a typical region along the national highway 204 in Jiangsu Province were studied based on the indexes of agricultural production and its growth rate, the proportion of agriculture in GDP, agricultural industry structure and comparative advantage of agriculture. Below were the results. First, the disparity in overall agricultural development between the counties in the region was becoming larger over the past three decades. The growth rates of agricultural production displayed a pattern of "north-higher and south-lower". Second, the proportions of agricultural product to gross domestic product of all the counties in the region were descending over the past three decades with the largest descending extent in the three southern counties. The disparity in agricultural proportion between the counties in the region was becoming larger over the past three decades. Third, agricultural industry structure also showed remarkable changes in all the counties, thereinto, plant industry proportion was descending and fishery proportion was ascending. The disparity in planting industry proportion and in fishery proportion between the counties in the region was becoming larger over the past three decades. Fourth, the pattern of "north-higher and south-lower" in comparative advantage degree of agriculture in the region was intensified over the past three decades with the lowest degree in the three southern counties and the highest degree in the northern counties. The results revealed processes of regional disparity and differentiation in the region since the implementation of the reform and opening up policy. The agricultural production function was shrinking gradually during the processes in the southern area due to rapid industrialization and urbanization. In reverse, agricultural production function became more important than ever in the northern area as a traditional farming area.