The Evolution Rule Between LUCC And Landscape In Inland Wetlands Of Subtropical China

Wetland is a kind of ecological landscape which is complicated structure and comprehensive functions, and it also has good ecological and economic value. The damage to ecosystem of wetland is more and more serious, which has lots of relationships with the land utilization of human in recent years. The wetland resources are rich in subtropical areas of our country. In this passage we do the related research between LUCC and landscape pattern in typical wetland of this area, it is important to the protection of wetland ecosystem and the development of regional economic.The main point of this paper:With the help of RS data and GIS technology, we take Poyang Lake, East dongting Lake and Hong Lake for example, they are inland wetlands in subtropical region of China. With four periods of remote sensing data of the three wetlands in 24 years, we get the land use type, land use dynamic degree and land use intensity and multiple landscape indexes in various periods. Through the analysis of space-time change law of landscape and the condition of land use cover change, we find the evolution law and commonness between LUCC and landscape pattern in the study period of three wetlands. At last we do the correlation analysis between the land use intensity and comprehensive index of landscape pattern in three wetlands.The main summary of this article:(1) From perspective of land use types, the area of lotus pond/fish pond is increased, the lake and tidal flats are in the conversion process in three wetlands from 1989 to 2013. For the acreage of uptown, Poyang Lake and East dongting Lake are increasing year by year, and Hong Lake is reduced. The acreage of woodland is rising. For the acreage of grassland, Poyang Lake wetland is reduced, and East dongting Lake wetland is increasing.(2) From the point of land use transfer matrix, the transfer between lake and tidal flats is most outstanding, and then the lake change of lotus pond/fish ponds is evident, it reflects some evolution law of the land use type in inland wetlands of subtropical China in a certain extent.(3) From the perspective of land use intensity index, the trend increased evidently, and it shows the land use is in a reasonable mode increasingly.(4) From the perspective of land use dynamic degree, the change of lake and tidal flats is more obvious according to the change of each class; From the general level, change is bigger in early term, medium-term changes steady and in minimum, and the change is moderate in late term.(5) From the total level of landscape, the degree of aggregation is increasing and boundary density is decreasing, the fragmentized degree of landscape is weakening, and the trend of diversity and complexity intensified.(6) From the perspective of the plaque index of landscape types, the acreage of unused land and the diversity of patch decrease, the lotus pond/fish ponds is tend to cluster and woodland tends to be concentrated, the patch shape of grass becomes more regular.(7) For the correlation analysis, it shows that the correlation between the land use intensity index and the comprehensive index of landscape pattern is in great differences among three wetlands.