Coastal Zone Landscape Pattern Change And Ecological Risk Assmennt

Coastal zone is an interactive zone between the sea and the continent, There is water, lithesphere, biosphere and atmosphere interaction zone. Coastal zone have varities of resources and excellent ecological environment become economic development founditions. With the development of social economy, a large scale human exploitation in promoting economic growth in coastal zone . At the same time, It were also produced a series of coastal resources and ecological environment problems, affected the ecological security of the coastal.Takeing the upper reaches of the Lingshui County coastal as the study zone in this dissertation. By 1998, 2004 and 2008 remote sensing date acquisition of relevant information analysed regional land use and the characteristics of landscape pattern change, learned from the relevent ecological risk assessment model, and at the help of the ArcGIS software, obtained research area in different periods of ecological risk index and ecological risk space distribution changes. Through the preliminary analysis to the following conclusions:(1) From 1998 to 2008 period, the land use change significantly in the study area, farmland, grassland and beaches is downward trend, and woodland, garnden land, construction land, water etc are on the rise; from 1998 to 2008, various types of land transfer the most area is farmland,to 14696.73 ha, second, forest land 1608.48 ha, garnden land 905.52 ha, construction land 299.79ha, water 300.6 ha, beach 580.05 ha.(2)Study from the overall level of landscape patterns, between 1998 and 2008, various types of landscapes of index show that: landscape types degree of fragmentation is increasing; space heterogeneous have augmented a lot; also polymerization degree is gradually reduced; plaques shape became more complex; the connectivity between patch types also tendend to decrease. The impact of human activities, the main patch types were decreased, each patch type was balanced show in the land pattern of development.(3)Thought the research area ecological risk space distribution, the coastal ecological risk is a ribbon distribution, the 10 years study shows that ecological risk remains the low ecological risk, the distribution of high ecological risk areas are relatively concentrated, mainly in the XinCun port, LiAn port, YingZhou town and other coastal areas, only the Variation of coastal Area has been changing all the time.