Abstract:

Based on satellite remote sensing image with GIS soft and statistical method,through area shrinkage intensity index of cultivated land and spatial overlay,this paper analyzed temporal and spatial feature of evolution of cultivated land resources in Changshu City to reveal the reduced law of cultivated land resources of developed districts such as Sunan.The research shows that cultivated land resources in Changshu reduced because of economic development,and the pointing of the conversion of cultivated land became quite strong due to the expansion of urban area and industrial land and the spatial pointing of settlement was gradually weakened.From the spatial feature of evolution the conversion of cultivated land  in Changshu mainly manifests as follows:1)  the cultivated land when the economy,developed fast and the development,reach to the higher level decreased more quickly;2) cultivated land decreases more rapidly in urban,port districts and developed towns;3) the construction of port districts and industrial districts speed up the conversion of peripheral cultivated land;4) the construction of transportation is a stable factor to the conversion of cultivated land;5) the spatial pointing of the conversion of cultivated land is different in various periods:cultivated land was occupied by residential land in 80’s,then mainly occupied by industrial land,urban land,port land after 2000.Urban development,port construction,traffic construction,rural settlement construction,industrial promoting and economic development are all dominant influencing factors of the shrinkage of cultivated land resources.

Key words: cultivated land resources/temporal and spatial of evolution/ the spatial pointing/feature/Changshu City