LAND USE CHANGE AND INFLUENTIAL FACTORS IN RESERVOIR AREA OF THREE GORGES

Regional land use change is an important part of global change.The research on land use change in the reservoir area of Three Gorges has attracted a lot of attention.The reservoir area has become one of the important research areas.Based on the Landsat TM datum in 1995,2000 and 2005,the land use change in the reservoir area of Three Gorges was monitored with the support of RS and GIS.Using the present land use map in 2005,the land use pattern was analyzed in 2005.It is indicated that most cultivated land is distributed in the upper reach area and the forestry land is aggregated in the belly area and lower reach area.Based on the land use change matrixes in 1995~2000 and 2000~2005,most cultivated land changed into construction land,with a decrease by 1 369.61 hm2 and 7061.05 hm2 respectively.In addition,river areas increased by 8 421.06 hm2 because of the rising of the water level.The dynamic degree of single land use change was used in order to describe certain land use change rate and the distribution of dynamic degree of single land use change using GIS.The theory of landscape ecology was adopted to illuminate the traits of land use change.Cultivated land decreased rapidly with the trend of fragmentation,and landscape diversity increased with the decrease of the land dominance.The canonical correlation analysis was used to understand the relationship between the land use change and social economic factors,and to identify primary social economic factors from the quantitative analysis.The increase of construction land is relative with the capital investment and the development of the first industry.It is considered that the present study is helpful for the land use forecasting and successive land use.