Study On Wetland Ecosystem Service Evaluation In Shengjin Lake National Nature Reserve

Wetland ecosystem provides important basic necessities for human survival and development.The evaluation of the value of wetland ecosystem services is a prerequisite for wetland management and protection.To conduct economic evaluation for the service functions of wetland ecosystem has become a hot spot in wetland ecology research.Previous studies on the value of wetland ecosystem services have focused on static assessment at a certain time.The dynamic assessment over time and the application of remote sensing technology are important directions for the assessment of wetland ecosystems in recent years.Shengjin Lake wetland is in the Ramsar List of Wetlands of International Importance.The service value of wetland ecosystems is very important.It is imperative to carry out in-depth research on quantitative evaluation of wetland ecosystem service value.In this study,the ecosystem service value of the wetland in the Shengjin Lake Nature Reserve was conducted based on matter quality and equivalent factor method.The material quality valuation was to classify wetland ecosystem service functions into four categories,that is support services,regulation services,cultural services and provision services,further divided into material production,water resources,flood control,climate regulation,water purification,biological diversity,biological habitat,education and scientific research,tourism and leisure 9 functions.Each function was valued according to the market value method,shadow engineering method,result reference method,and conditional value method commonly used at home and abroad.The second method was to use the equivalent factor per unit area method to revise the value equivalent factor of wetlands in Shengjin Lake on the basis of the study of Gaodi Xie and others and to amend the equivalence factor of different wetland types.Based on the remote sensing interpretation of the wetlands in Shengjin Lake National Nature Reserve,combined with the dynamic of land use and transfer matrix analysis,the dynamics of wetland ecosystem services in Shengjin Lake National Nature Reserve in 2000,2004,2010 and 2016 were studied.The main results are as follows.1.The value of the wetland ecosystem services in the Shengj in Lake National Nature Reserve was 0.2265 billion(RMB)per year.The provision service value of the material products and water resources was 0.364 billion(RMB).The value of flood control,regulate the climate and water purification were 0.747 billion(RMB),0.586 billion(RMB)and 0.001 billion(RMB),respectively.Biodiversity and biological habitat service value were 0.298 billion(RMB)and 0.026 billion(RMB),respectively.The value of educational research,recreation and entertainment services in cultural services was 0.101 billion(RMB)and 0.142 billion(RMB),respectively.Among them,regulation services contributed the most to the total ecosystem service value,accounting for 58.90%of the total value,indicating that Shengjin Lake is an important climate regulator in the region.2.According to the unit-area value-equivalent factor method from 2000 to 2016,the wetland in the Shengjin Lake National Nature Reserve changed significantly.The overall change trend was that the area of paddy fields and lake shores increased,the area of lakes and other wetlands decreased.Most of the reduction in the area of the lake was mainly converted to the area of paddy fields.The total value of wetland ecosystem services in Shengjin Lake National Nature Reserve wetlands in 2000,2004,2010 and 2016 was 0.764 billion(RMB),0.767 billion(RMB),0.684 billion(RMB)and 0.735 billion(RMB)respectively.3.The value of the cultural service in the two method evaluation only accounted for about 10%of the total service value,and the value of the cultural service was relatively low compared to the supply and adjustment service.The value of cultural services in the Shengjin Lake National Nature Reserve has still greatly enhanced potential.4.The material quality method assessment may be more in line with the actual ecosystem service value provided by humans,and the dynamic assessment can reflect the dynamic change process of the region from space and time.In the future,the evaluation of the service value of similar wetland ecosystems can be combined with the two methods to implement comprehensive evaluation.