REGION ANALYSIS OF CULTIVATED LAND PRESSURE IN COASTAL REGIONS OF JIANGSU PROVINCE

Gu Xiang,Zhou Shenglu,Zhang Hongfu(School of Geographic and Oceanographic Sciences of Nanjing University,Nanjing 210093)

Cultivated land-grain-population complex system;Pressure index of cultivated land;Cultivated land pressure regionalization;Coastal region of Jiangsu Province

Based on the analysis of dynamic changes of cultivated land-grain-population complex system between 1999 and 2007,this paper calculated the pressure index of cultivated land of 3 districts and 14 counties(or county-level cities) in the coastal region of Jiangsu Province,and divided it into four regions to further analyze its characters and driving factors.Results showed that: during the year of 1999~2007,area of cultivated land fluctuated in a decreased way,while the population kept on increasing,so the area of cultivated land per capita decreased continuously.The total grain yield and per capita grain yield decreased in the beginning and hit a low point in 2003,then increased in 2007;the pressure index of cultivated land(K value) showed the features of 2003 > 2007 > 1999 when analyzing the coastal region of Jiangsu Province as a whole.The K value showed the charicteristics of Nantong coastal region > Lianyungang > Yancheng when analyzing the characteristics of cities When making a concrete analysis of the counties(county-level cities,districts),the K value in seven counties,such as Donghai county,was kept in a lowest level,while Nantong and Lianyungang districts were the largest.The other four counties and districts,such as Yancheng district,rose with a big margin between 1999 and 2003,and then rolled back in 2007.Three county-level cities,such as Tongzhou tended to increase.The variation scope of Ganyu county was the largest.Finally,the paper discussed about measures for controlling cultivated land-grain-population complex system in different coastal regions of Jiangsu Province.