Study On Cultivated Land Changes And Its Driving Force In Changsha

As an important land use type, cultivated land is the sources of human's food and clothes and it is also the important material foundation for human's survival and development. Cultivated land use change and protection have become the important components of land-use/land-cover change. Strengthening the research of cultivated land use change and analyzing the driving factors which affect changes of cultivated land use are of great benefit to use the arable land reasonably. Meanwhile these will ensure the regional food security and help advance the development of a harmonious society.Based on the historical data of cultivated land and economic development data during 1991 to 2008, this paper analyzed temporal and spatial change characteristic of the cultivated land of Changsha. And then, main factors of driving forces in cultivated land change was analyzed by the principal component analysis and multiple regression analysis.The results showed that:①The cultivated land of Changsha showed a downward trend during 1991-2003 and a slight rising trend during 2003-2006.The annual decline rate during 2003 to 2008 was about 0.26%.②Regional difference between regions was obvious.③The principal component analysis showed that:Economic factor and agricultural factor could be summed up as the two main factors of reducing cultivated land in Changsha, and the economic factor was the key one. Multiple regression analysis also showed that:the economic factor was the most important influence factors to the change of cultivated land of Changsha.④Based on the result of principal component analysis and multiple regression analysis, countermeasures were proposed from the perspective of laws, regulations, policy, economic and technical means.