Eco-environmental Quality Assessment of Dagu River Estuary Wetland based on RS Images

To investigate the state of wetland eco-environmental quality in Dagu River estuary, a comprehensive evaluation index (CEI) method was employed. A set of assessment indicator system was established based on the Pressure-State-Response (PSR) model. Thirteen indicators were elaborated and standardized by determining uniform criterion. It is found that: (1)The wetland eco-environmental quality of Dagu River estuary was bad both in 2000 and 2003, and human disturbance was the most important influencing factor; (2)The wetland landscape has suffered serious fragmentation, both the rationality of organization and resistibility of the wetland ecosystem have a down trend; (3)During threee years, the natural wetlands decreased by 12.39%, on the contrary, the area of aquiculture increased dramatically by 6.69%. Thus, the chief measure to protect the Dagu River estuary wetland should be setting a limit to human development activities, in which aquiculture controlling should be the most important one.