Analysis on Landscape Pattern Dynamic of Rock Desertification in Northern Guangdong,China from 1988 to 2004

With GIS and landscape pattern theory,the typical Karst landscapes and spatialtemporal dynamic of rock desertification land change and their ecological conditions at the north of Guangdong were analyzed based on translated data from remote sensing images in 1988 and 2004.The results indicate that the area and the patch number of rock desertification decreased respectively by 721.67 km2 and 1 900 blocks from 1988 to 2004.The area ratios of rock desertification land to the total of this region were 3.33%,7.28%,1.54% and 5.11% respectively at Lianzhou,Yangshan,Yingde and Ruyuan in 2004.All kinds of landscape index were calculated at class level and landscape level.Quantitative analysis showed that the spatial pattern changes of rock desertification in the four counties have the same trend but are different at degree.In details,the landscape heterogeneity and fragmentation all declined,while landscape dominance increased.Along with the operation of rock desertification controlling countermeasures the moderate and severe rock desertification types of this region became the hot spot,the counties of Yangshan and Ruyuan showing more obvious spatial pattern changes.