| Ecosystem service value is one of the most popular methods of studying wetland at present. This method quantifies ecosystem with economics and mathematical methods, so it is more easily acceptable to people. Study on wetland eco-system now is a hot issue on the international ecosystem study. The ecological benefits of wetland increasingly reflect in all aspects of people’s lives. How much is the ecological value of wetland? Many scholars have calculated different scale of wetland ecological system and concluded a large number of research results. On the basis of the predecessor’s research, by considering the natural disturbance factors on wetland ecosystem, this article accounts a good ecosystem’s fluctuations amount of ecological value before and after the disturbance. The research area in this article is Honghu wetland. The article has studied the economic value of Honghu wetland eco-system, and has worked out the ecological value difference between a normal year and the disturbance before and after the flood and drought. Then it draws that the ability to adapt flood resilience of Honghu wetland is much larger than to drought. And this article also analyzes other great lakes which in the same valley and the same latitude space with Honghu lake, then summarizes their same points and the common development tend. This article has certain significance on research of Honghu lake wetland ecological value, and the countermeasure of flood and drought disasters to Honghu lake wetland in the future. The article can be divided into five parts, its main contents are as follows:The first part is introduction. It mainly elaborates on the background of the thesis topic, the current research at home and abroad, the research objectives and content, and the methodology.The second part is the theoretical basis. It mainly introduces the theory of perturbations and interference, and analyzes the differences and priorities between disturbance and interference. It also analyzes the characteristics of flood and drought disasters in China, and then compares the difference between the disaster and the situation which not caused damage, and shows the division pursuant of flood and drought disaster grade basis. It describes the principal method for the evaluation of ecosystem service function value, and the mathematical calculation methods used in different types of ecosystem service function.The third part is case study. It mainly studies on the size of ecosystem service function values of Honghu lake wetland. By using five consecutive years’data of the related production of Honghu lake wetland, it comes that the ecosystem service function values of Honghu lake wetland in five years,2007-2011, which respectively are:20.5856X108yuan,21.8451X108yuan,24.3408X108yuan,24.4078X108yuan,21.2452X108yuan.And the three years,2007-2009, the production of Honghu lake wetland increases every year, so increasing its ecological value. Compared2010to2009, due to the serious water-logging, lead to fluctuations of its production values. So the production value in2009-2010increases only a little. Compared2011to2009, there was a70year of severe drought and suffered a great losses, so the ecosystem value has a large fluctuation.The fourth part is the discussion part. It mainly analyzes the results of Honghu lake wetland ecosystem value in normal and abnormal years, and comes to the result that the ecological value of Honghu lake wetland is great and it highlights the contribution to humanity. So the protection to Honghu lake wetland should be strengthened. It also shows that Honghu lake wetland is a fragile ecologically ecosystem. Honghu lake wetland exhibits different adaptations to flood and drought disasters. The flooding impact on wetland is relatively small, and the flooding have a certain impact on the production value, while drought could lead to a large change of wetland ecosystem even perish. It also analyzes the common problems in other lakes which in the same valley with Honghu lake wetland, and then gives a number of development proposals. The case study of Honghu lake wetland can bring benefits to other lakes in reasonable development and utilization.Part five is the conclusion. It summarizes this article’s the main conclusions, and then to the insufficient of this research, it points out the further study direction. |
