The Study On Coastal Ecosystem Health Assessment In Tianjin Coastal Zone

Health and relative stability of coastal ecosystem are necessary to human survival and development. It is very important to maintain ecosystem health and its well-circulation. In the last 20 years, the concept of ecosystem health was brought forward and has become the new focus and most active front in ecology studies. Abroad, ecosystem health studies on agro-ecosystem, hydro-ecosystem, forest ecosystem and urban ecosystem, et al, have been developed. In recent years ecosystem health has also got more attention at home, but study on coastal ecosystem health isn't still systemic.In the thesis, the theory and methodology of coastal ecosystem health analysis are explored deeply. Then the concept of coastal ecosystem health is clearly summed up, and primary quota system of regional coastal ecosystem health assessment is set up. Gray Correlation is improved by introducing Gray Dispersion and based on which, coastal health assessment model was established. Finally, the case study in Tianjin Coast is done, and based on assessment results and main ecological problems, relevant management and control measures are put forward.The main content and results are as follows:First, academia skill have no a definite and consistent expression versus coastal ecosystem health concept. In this thesis, coastal ecosystem health concept is put forward clearly by integrating relative concepts and considering fully characteristics of coastal ecosystem.Second, according to "Sea beach-Water environment-Social economy" model, first developed by this thesis, primary quota system of regional coastal ecosystem health assessment is set up.Third, Gray Correlation is introduced into and improved by defining Gray Dispersion. Then manage it in coastal ecosystem health assessment. In allusion to actual requirement of coastal ecosystem health assessment, subordinate degree assessment model and grey index model were established, respectively.Finally, example evaluation research results of Tianjin coastal health, in the latest fifty years health status of Tianjin coastal zone has been becoming worse, and the ecosystem health class was Grade Four in 2003. Through pricipal component analysis, population pressure, land use, economic development and environmental pollution were primary intimidation factors of Tianjin coastal ecosystem health impairment. According to assessment results and main ecological problems, relevant management and control measures are put forward.