| Wetland, as an important type of ecosystem, has been highly valued by all sectors of society. The Mingcui Lake Wetland as a typical human disturbance strong urban wetland, It has important representative in Yinchuan plain and the Northwest region, to carry out its ecosystem health assessment is very important.The paper combination of theory and practice, through field monitoring and investigation to evalate the four seasons water quality of the Mingcui Lake wetland and ecological health assessment was carried out, Then,proposed the corresponding guarantee measures.Firstly,To evaluated the quality of water in the Mingcui Lake Wetland.The use of water quality index and eutrophication index to evaluated the Ming Lake Wetland seasons water pollution levels, eutrophication, aquatic organisms situation; secondly, The Mingcui Lake Wetland ecosystem health assessment was carried out, first determined the evaluation object and evaluation.Then compare and evaluate research on the theory and methods.Comprehensive evaluation method based on domestic and foreign, using the PSR model as the basis of logic, for the Mingcui Lake Wetland pressure, state and response system, constructs the Mingcui Lake wetland ecosystem health assessment system. Selected the drought index, tourism development strength, water supply pressure, rich nutrition index, aware of the biomass of phytoplankton, planktonic animals, benthic animals volume, sediment pollution levels, policy and implementation efforts, public participation, management of wetlands, total of 11 indicators.The Wetland ecosystem health is divided into five grades, as follows:"excellent, good, fair, poor and bad", and determine the various indicators of the health evaluation grade standard. According to analytic hierarchy process and improved entropy method to determine the weights of evaluation indexes. Among of them, the most important subsystem is pressure subsystem, the weight value 0.4546, This paper according to the healtn of each evaluation index to analysis the system ecological health. Finally, use the multi-level fuzzy comprehensive evaluation method to evaluation ecological health of Ming Lake wetland.Conclusions are as follows:(1) Single factor evaluation results show that:The most important pollutants of the water quality was chemical oxygen demand in the Mingcui Lake Wetland, exceeded the rate reached 55%, total nitrogen was secondary pollutants, exceeding rate was 25%, total phosphorus exceeded rate was 10%, Ammonia nitrogen was in the standards and exceeding standard multiple smaller.There was a big difference between the comprehensive pollution index of water quality, The reasult performance that the comprehensive pollution index is generally high in spring, followed by summer, autumn and winter.(2) The Mingcui Lake Wetland in all sampling sites rich nutrition evaluation results showed that the open waters of nutrition, other waters for mild eutrophication, severity of nutritional conditions as follows:Scenic Gate East> reed maze Coast> reed maze center> lotus pool> open waters.(3) The Mingcui Lake Wetland each main aquatic content from high to low as follows:reed maze center> lotus pool> scenic East Entrance> open waters> reed maze coast. Phytoplankton biomass in the 5.37-16.95mg/L. The annual average biomass 9.27mg/L, the highest value for reed maze center 16.95mg/L; zooplankton biomass in the 0.52-1.63mg/L. The annual average biomass is 0.88mg/l, the highest value for lotus pool 1.63mg/L; zoobenthos biomass in target res.9.04～19.44g/m2.The annual average biomass 14.69g/m2, the highest value for the lotus pond 19.44g/m2.(4) The comprehensive assessment of wetland ecosystem health score is 3.1225, health in the class. That means Mingcui Wetland ecosystem biodiversity and structure occur some degree of change, the main service function, can still play, but also occurred in the moderate degree of degradation.(5) Each subsystem comprehensive health score values were:pressure subsystem score is 3.4401. Health level is middle; state subsystem health score value is 2.6810. Health level is poor; response subsystem state health score value is 3.7420. Health level is middle. The conclusion show that pressure subsystem influenced the health siuation of the Mingcui Lake Wetland.(6) The restriction factor and key factor for Mingcui Lake Wetland health development were water pressure, sediment pollution levels, policy awareness and implementation efforts. The paper based on the analysis of the reasons for Mingcui Lake wetland ecosystem health.According the actual condition proposed adaptive management strategies and optimization measures, to eliminate and improve the effect on Ming Lake wetland ecological health factor, promote the Mingcui Lake Wetland to the healthy and orderly development, and enhance the service function, to achieve sustainable development. The main countermeasures are as follows:①To improve the countermeasures, strengthen the scientific management.②Prfect the mechanism of water supply, reduce the water pressure.③The control of water quality and safety, improve lake water quality.④Enrich the landscape pattern, improve the living environment.⑤The increase in science education and management, promote public participation.The research analyzes the influence scope and extent of human for the Mingcui Lake Wetland,determined the objects of protection and management objectives of Mingcui Lake Wetland, to guide and maintain Ming Lake wetland ecosystem health practice has practical significance. Research work of this paper can provide the theoretical foundation and the technology of operation method for the Mingcui Lake wetland ecosystem health assessment, research results for regional wetland health conditions provide a reference,also for the future implementation of wetland ecosystem health supervision and ecological recovery to provide relevant information. |
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