| Wetlands are the ecological landscape with the most bio-dieversities in the nature's field, and one of the environments that human society depends on and develops in. They are also the hot research field that current international scholars of many subjects focus on. There are many land-use type in the wetland region. In recent years, the land-use types are changing tremendously. The phenomenon that the wasteland intensifies the use of the wetland and the damage to the wetland makes the wetlands area and bio-diversities reduce sharply, the wetland functions degrade and the level of sustainable development of the wetlands decrease. Wetland—use change and the level of the sustainable development reflects the changing trend of the wetland ecosystem, so the proportion of the wetland becomes the most primary issue. Based on the image data(landsat TM) from 1995 to 2004, and the resources of Zhalong wetland ecomonic, social and enviromental conditions, using the more advanced geo-spatial technoliogy(3S technology) and the Projection Pursuit evaluation and analysis methods, the research analyzes Zhalong dynamic contditions of wetland. On the base of this research, Zhalong wetlands study in sustainable development for the realization of Zhalong wetland sustainable use of land resources and socio-economic sustainable development provide the theoretical referencs. The main conclusions are as follows:⑴The land-use of different types of Zhalong wetlands in the study period(1995-2004) changed apparently. Among them, grass(94.12%), lakes(-58.67%), arable land(17.88%) and marsh(-9.12%) the overall changing extent was relatively great within 9 years. Swamps, lakes, and saline in different periods showed fluctuation, and the changing extent of the resident lands were the smallest.⑵Changes in land use structure made the proportion that the area of grassland, cropland cccupied the overall area increase, the proportion of cultivated area declined, the proportion of resident land change little.⑶In each study period(1995-1997,1998-2000,2002-2004 and 2005-2007), Zhalong sustainable use of wetlands showed fluctuated situation. During the period of 1998-2000, the level of the sustainable development of Zhalong wetlands was relatively high. In the next period(2002-2004), the level declined, but the level increased after 2005.⑷With the impact of human activities on wetlands growing heavier, the wetland ecological system was seriously damaged. During the research period, the sustainable development level of resources and the environment subsystem decreased continuously, and such performance was especially apparent after entering this century. Under the influence of the subsystem of resources and environment, the sustainability of economic subsysten and social development subsystem declined to differert extent.⑸From the end of the 20th to the beginning of this century, the sustainable development of Zhalong wetlands within the counties have dropped to different extents. Among them, the county's resources and environment sub-system performance was the most obvious. With the gradual improvement of the level of the land use, salinization of land increased, resulting in an increase in the number of low-yield field, and decrease in grain yield per unit area and leading to land ratio continue to increase. Development projects increased fragmentation of wetland landscape in the degree of marsh area and lake area have continued to decline. Wetlands, the extent of sustainable development within the county were severely affected. |
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