Research on the landscape change of YeYaHu wetland based on remote sensing fusion

Because of its special resources and function characters, the wetlands are being attached more and more importance. The Yeyahu wetland is a typical artificial wetland in the north China. It´s the only natural conservation area in Beijing region. It locates in the northwest Beijing where is the sand storm coming through road. The wetland is the first circle- protection band for Beijing, and is the northwest ecological shelter. But affected by the strong coercion factor, the resources and the structure have changed quietly in resent ten years and it has threatened the healthy development. Using the fusion remote sensing technology with TM and IRS as date resource, the field circumstance monitoring was conducted. By this research, we found the area of the wetland had decreased more than half. What´s more, the environment is tending to be worse. The reasons for wetland dynamics were analyzed. This is the base for wetland protection and restore.