Study on Spatial-temporal Differences of Using the Cultivated Land Based on Entropy

The evaluation index system of intensive use of arable land was established in view of the actual situation of Wu'an city.The intensive utilization of land condition was analysed using the improved entropy method.The results showed that the intensive use of cultivated land could be divided into three stages from 1997 to 2008.The first from 1997 to 1998 and the third from 2004 to 2008 were increased volatility and the other from 1999 to 2003 was continued to decline.With respect to every village,The overall level of intensive use of the eastern part of cultivated land was not high and most of below 0.5 and the eastern was higher and western was lower from the geographical point of view.