The Analysis on Spatial-temporal Evolution of Beach Cultivation and Its Policy Driving in Xiamen in Recent Two Decades

The beach is an important wetland resource and renewable reserve land resource.The spatial-temporal evolution of beach cultivation can sensitively reflect the gambling relationship among the industrial economic development,the eco-environmental change and the policy guide in the seaside city.Through interpretation,analysis and statistic to the four temporal TM remote sensing images in 1986,1989,1993 and 1997 and the two temporal ETM+ remote sensing images in 2001 and 2003 as well as the SPOT remote sensing image in 2004,the spatial-temporal evolution patterns of beach cultivation are analyzed with the single land use dynamic index,landscape fragmentation and the model on changes of gravity center in Xiamen in recent two decades.The results indicate that:the area of beach cultivation had increased continuously from 2 661.85 hm2 in 1986 to 9 776.45 hm2 in 2003,more than 2.67 times,and then it started to drop to 9 510.98 hm2 in 2004,and the average annual rate of change had gradually dropped from 19.80% during 1986 to 1989 to-2.72% during 2003 to 2004;landscape fragmentation was all smaller than 0.00080 during 1986 to 2004;and the gravity center of beach cultivation had moved northeast on the whole.The preliminary study on the policy driving mechanism about the spatial-temporal evolution of beach cultivation suggests that,there is a macroscopic response relationship between this kind of evolution pattern of beach cultivation and a series of the local policies and measures.