Study On Theory Method And Application Of Regionalization And Evaluation Of Aquatic Ecosystems

Aquatic ecosystems status is closely related to water resources, so a hygeian aquatic ecosystem should be maintained to protect water effectively. However, ecological protection is an extremely complicated systematic engineering, which involves many fields such as ecological water use, ecological restoration, ecological monitoring and evaluation, as well as allocation and dispatch. The relationships between upper and lower reaches, left and right bank, main stream and branch, as well as protecting and exploring should be planed as a whole to consider. It also demands collaborations of various departments such as water resources department, environmental protection department, land and resources department, agriculture department, etc. Researching regionalization and evaluation of aquatic ecosystems is an effective way to implement water environment management and protection according to regions.Aquatic ecosystem is a comprehensive ecological environment system, with rivers, lakes, reservoirs and adjacent wetlands ecosystems at the core, and including lands within a certain limits. The two-stage classification system is set up from the perspective of ecological factors synthesized and water's functions highlighted. And then, the regionalization methodology of aquatic systems is proposed, which consists of guiding concepts, fundamental principles, regionalization approaches, nomenclature and code rules. All these are based on hierarchy theory and ecological principal. At the same time, relevant achievements, characteristics and rules of entironment are considered. The bottom-to-top method and top-to-bottom method are combined, involving various qualitative analysis methods such as overlapping method, landscape mapping method, geographic correlation method, leading mark method and Delphi technique. According to aquatic ecosystem service functions, the evaluation index system is created by selecting indexes from modules. Combining qualitative and quantitative analysis, evaluation of single-index and multiindex synthetically are performed in the aquatic ecosystem evaluation. Base on analyses and identification of the Huaihe River Basin, theory method of regionalization and evaluation of aquatic ecosystems is applied on catchment scale, and the regionalization scheme and evaluation results are put forward. Finally, considering the objective of serving water resources and ecological conservation, the protection and restoration technology system is established in the Huaihe River Basin.Guided by the idea that man and nature live in harmony, aiming for health and sound development of aquatic ecosystems, the scientific and reasonable regionalization and evaluation are researched. The innovative classification system of aquatic ecosystem service functions and theory method of regionalization and evaluation are presented. Further, the Huaihe River Basin is taken as an successful application. The results are significant to discriminating ecology characteristics and functions, guiding ecological protection and restoration, along with guaranteeing balanced and healthy development of economic and social.