Spatial and temporal change of wetlands in Bohai rim during 2000-2008: An analysis based on satellite images
环渤海滨海湿地时空格局变化遥感监测与分析

The coastal wetlands along the Bohai rim are undergoing rapid change. It is significant for regional planning to aware of these spatial and temporal changes. Multi-years of Landsat TM data and some other remote sensing data are used to conduct Human-Computer interaction visual interpretation of wetlands. Assisted by the collection of field samples, the distribution and classification of wetlands along the Bohai Sea in 2000, 2005 and 2008 are extracted. The change rate model of single type and the regional dynamic degree model are constructed under GIS to reconstruct spatial and temporal pattern and dynamic pattern of the wetlands. The dynamic transfer matrix is constructed to reflect the dynamics reasons. The results show that: the brine pan and reservoirs/aquiculture, which are all manmade wetlands, have the biggest area amount and the biggest growth rate, with annual growth 205.52 km2 and 146.10 km2, respectively. The reduction of bottomland and tideland are more obvious than the other types. The Yellow River basin has the most significant wetland change, which is twice bigger than that of Liao River basin and Hai River basin, and still growing larger. The dynamic degree of the Hai River basin has shown the reducing trends. The wetland change driven by human activities is more obvious than the natural drive. The main wetland types transfering are caused by human activities such as the reclamation, tideland or bottomland for aquiculture, constructed land or brine pan.