| Wetland which belongs to watter-land transitional zone is the most important Landscapes and ecosystem in earth. It is also indispensable ecological landscape and environmental capital with biological diversity for human. The functions of wetlands include water conservation, climate regulation, protection of biological diversity, leisure, culture, research and so on. Lanzhou is the only city of Provincial capital by Yellow River through. Yewllow River wetland is essential to environmental quality and economic development of Lanzhou. This paper research the landscape change of Yewllow River wetland in lanzhou from 1994 to 2007. by remote sensing image both in 1994 and 2007, the actual survey and models, wetland landscape pattern and change along the Yellow River in Lanzhou in 1994 and 2007 are analyzed.This paper also evaluated the ecosystem service value of Yellow River wetland in Lanzhou by the ecological economics and environmental economics theory; By using expense method, shadow project method, replacement cost method and willingness to pay method (CVM), We know the using value of Yellow River wetland in Lanzhou is 571,418,900 yuan/a and the non-using value of Yellow River wetland in Lanzhou is 2,567,850,000 Yuan/a. Through the studying on landscape changes, we can get some conclusions about landscape changes situation of Yellow River wetlands in Lanzhou in recent years,It can provide a basis for exploring the evolution and driving force of evolution of Yellow River wetland in Lanzhou in the future, So it is of great significance in sustainable development of the ecological environment In Lanzhou.The Intuitive researching in ecosystem service value, on the one hand, will allow people to intuitively understand the ecological value of wetland and recognize the necessity and importance of wetland protection in Lanzhou. on the other hand, will provide the basis and reference for protection and management of wetland, even the formulation of relevant policies in Lanzhou. |
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