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Evaluation On The Ecosystem Services Values Of Urban Lake Wetlands

Posted on:2011-01-10Degree:DoctorType:Dissertation
Country:ChinaCandidate:F Z WangFull Text:PDF
GTID:1101360308985868Subject:Garden Plants and Ornamental Horticulture
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Currently, human survival environment have been destructed unprecedented, and people began to concern ecosystem services value. Many researches of evaluation on ecosystem services value have been carried out, objects of study concern ecosystems of forest, grassland, wetland of globe, region, nation, and city. Owing to the special location and functions, urban lake wetlands ecosystem is a unique natural resources ecosystem and play very important role in the development of city. Scientific evaluation on ecosystem services values of urban lake wetlands, not only provide the basic data for the establishment of regional ecological accounts, but also make rational regional ecological protection and economic development decision, and protect and recovery urban lake wetlands ecosystem.Acclaimed as "the city of hundred lakes" of Wuhan city is the first water ecosystem protection and restoration city of ministry of water resources. Due to the influence of long-term urbanization, urban lake wetlands in Wuhan are faced serious problems, such as areas reduced, pollution, eutrophication, man-made interference the interface of water and land. Recently, Wuhan municipal government has been taking measures to govern and protect urban lake wetlands. However, confronting the funds requirements of various types of urban lake wetlands, government is difficult to decide the governance keys and the scale investment because of the evaluation on ecological services values.The paper researched into the theory and method of evaluation on ecosystem services values of urban lake wetlands, established the evaluation index system of evaluation on ecosystem services values of urban lake wetlands, and discussed the difference of direct use value, indirect use value, and non-use value of urban lake wetlands in different man-made disturbance. The results showed: (1) The man-made disturbance influence the direct use values of urban lake wetlands. The shown trend of substance production value and water conservation value were natural lake> semi-natural lake>artificial lake, and leisure tourism value was artificial lake> semi-natural lake> natural lake. The shown trend of per unit area of direct use value of urban lake wetlands was artificial lake (37.06 Yuan·m-2·a-1)> semi-natural lake (15.85 Yuan-m-2·a-1)> natural lake (2.98 Yuan·m-2·a-1)(2) The shown trend of carbon fixation and oxygen release value was natural lake> semi-natural lake> artificial lake, and water purification value and flood control value were artificial lake> semi-natural lake> natural lake. The value indirect use of urban lake wetlands has to do with the existence of urban lake wetlands. The difference of indirect use value of per unit area of urban lake wetlands is small, and it was between 20 Yuan·m-2·a-1~23 Yuan·m-2·a-1.(3) 90% of the respondents thought that the non-use value was very important, that 41.2% of the respondents were not aware of the environmental changes of urban lakes in Wuhan, and that the importance of the degree of the three components of non-use values was existence value> heritage value> option value. The mean WTP to difference disturbance of urban lake wetlands the shown trend was semi-natural lake> natural lake> artificial lake. The impact analysis of total samples factors on WTP showed that age, annual income, educational level were correlated remarkably with WTP, while gender, profession, professional title were not. In addition, annual income, education level and professional title were also correlated remarkably with WTP value, however, gender, age, profession also weren't.(4) The total ecosystem services values of the natural Yandong lake was 48940.86×104 yuan·a-1, which was of 55.36% of the revenue of Hongshan District in 2008. The direct use value, indirect use value, and non-use value was 2628.80×104 yuan·a-1,17759.26×104 yuan·a-1,28552.80·104 yuan·a-1, respectively, the shown trend was non-use value> indirect use value> direct use value, and the non-use value was 1.40 times the use value. The total ecosystem services values of the semi-natural East lake was 167204.20×104 yuan·a-1, which was 1.14 times of the revenue of Wuchang District in 2008, and 1.89 times of the revenue of Hongshan District in 2008. The direct use value, indirect use value, and non-use value was 52797.40×104yuan·a-1,85435.38×104 yuan·a-1, 28971.42×104 yuan·a-1, respectively, the shown trend was indirect use value> direct use value> non-use value, and the use value was 4.77 times the non-use value. The total ecosystem services values of the artificial Ziyang lake was 21960.87x104yuan·a-1, which was of 14.97% of the revenue of Wuchang District in 2008, and 24.84% of the revenue of Hongshan District in 2008. The direct use value, indirect use value, and non-use value was 787.09×104 yuan·a-1,312.88×104 yuan·a-1,20860.99×104 yuan·a-1, respectively, the shown trend was non-use value> direct use value> indirect use value, and the non-use value was 18.97 times the use value.(5) The total ecosystem services values of the 38 urban lake wetlands in Wuhan was 1557245.79×104 yuan·a-1, which was of 19.69% of the revenue of Wuhan city in 2008, and 17.62 times of the revenue of Hongshan District in 2008. The direct use value, indirect use value, and non-use value was 224156.70×104 yuan·a-1,354330.48×104 yuan·a-1,978759.61×104 yuan·a-1, and respectively, the shown trend was indirect use value> direct use value> non-use value, and 62.85%,22.76%,14.39%。The highest contribution rate of the total ecosystem services values of the 38 urban lake wetlands in Wuhan was semi-natural lake, the second was natural lakes, again the artificial lakes.(6) In the 12 evaluation indexes, the sequence was existence value, transpiration endothermic value, heritage value, leisure tourism value, option value, water conservation value, substance production value, flood control value, research and education value, biological diversity maintenance value, carbon fixation and oxygen release value, water purification value. The biggest was existence value, which was 519673.15×104yuan·a-1. The shown trend of direct use value was leisure tourism value> water conservation value > substance production value, the percent was 85.33%,8.64%,6.03%, respectively, the indirect use value was transpiration endothermic value, flood control value, research and education value, biological diversity maintenance value, carbon fixation and oxygen release value, water purification value, the percent was 93.93%,2.67%,1.82%,1.18%, 0.37%,0.04%, respectively, and the non-use value was existence value, heritage value, option value.
Keywords/Search Tags:urban lake wetlands, ecosystem services, value evaluation, Wuhan city
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