| In recent years, urban wetland park is developing rapidly, but there are few theoretical researches on urban wetlands. So it is crying out for theoretical researches to maintain health and sustainability of urban wetland park. Xixi national wetland park was selected as study area for its well-known in China. Several discipline theories and methods, which including the theories of geography, landscape ecosystem, environmental science and the methods of RS, GIS. geostatistical analysis and modeling, were used to study the theory of landscape health in urban wetland park. The main research findings include:(1) Connotation and function of urban wetland park was scientifically defined. Urban Wetland Park was the open system which was composed of the park itself and its surroundings. Urban Wetland Park is dependent on structure and process of itself and close connection of surroundings. In sum, urban wetland park rolls the function of ecological protection and rational utilization into one landscape system, which characterized by frangibility, multiscale and functional diversity.(2) Classification system was established to understand functional character in urban wetland park basing on landscape function. Landscape classification system was applied in Xixi Wetland Park. Landscape structure was studied based on the classification. The results show that the area of ecologically protective landscape constitutes 53.70% of whole park, tourism and leisure landscape accounts for 46.30% of the park. Ecologically protective patches cover 42.08% of the park with large area, complex shape and low diversity. Tourism and leisure patches cover 25.41% of the park with small area, regular shape and high diversity. Compare to the structure of patches, the area ratio of ecologically protective corridors to tourism corridors was one to two. The network structure of ecologically protective corridors was more complex than that of tourism corridors.(3) The method of landscape structure health was set up in urban wetland park, which take empirical research on Xixi Wetland Park. The analyzing results indicate that Xixi Wetland Park share two significant characteristics:social economy and ecological protection. Socieconomic sustainability of the degree "very good" was located in the surrounding area of park and the degree "very bad" was located in the center of park. In contrast with socieconomic sustainability, the spatial distribution of ecological protection sustainability show opposed features. Take the sustainability of social economy and ecological protection into consideration. landscape structure health in Xixi Wetland Park stay in fine degree. The area of healthy and diseased landscape structure accounts for 42.97% and 2.15% respectively in the park.(4) The method of water health was created from water status and water process in urban wetland park. Taking Xixi Wetland Park as study area can draw the conclusion below. Water status in Xixi Wetland Park mainly focuses on health and subhealth and the area of it cover 96.92% of the park. Seasonal and spatial variation of water process is significant with higher spatial variation in summer and lower spatial variation in winter. Taking water status and water process into water health, the result indicated that water mainly stay under subhealth. which means that attentions should be paid on water quality in Xixi Wetland Park.(5) Comprehensive evaluation on landscape health was considered by landscape structure health and water haelth in Xixi Wetland Park. The result showed that the area of very good health and good health landscape mainly distributed in the center of park, covering 23.63% of the whole park. The area of ill health and diseased landscape accounted for 41.39% of the park and disturbed around the park. Studies indicated that the problem of landscape health existed around the park.(6) Based on the study of landscape health, the influence factors of landscape health were analyzed from internal and external factors of Xixi Wetland Park. Many suggestions were also provided to management of the park, including reduction human disturbance, adjustment structure of landscape and maintenance water quality of Wetland Park. |
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