Quantitative Analysis on Spatial Distribution of Land Cover Pattern and Landscape Features in Poyang Lake Region
Poyang Lake is the largest freshwater lake in China. It plays an important role on ecosystem services, such as flood regulation and storage, water conservation, etc. It is important for the evaluation of its environmental protection and ecosystem services to grasp the spatial pattern and laws of land cover distribution in the Poyang Lake region. Based on HJ images and Poyang Lake land cover data in 2005, this paper obtained the Poyang Lake region land cover data in 2010 by using GIS, RS technology and quantitatively analyzed the land cover spatial distribution pattern of the Poyang Lake region in 2010. The results show that; (1) Base on HJ images and the existing land cover data, the regional land cover data can be updated dynamically. Using the HJ images in 2010 with the 2005 land cover data, the 2010 land cover data was obtained by artificial visual interpretation. Verified by the measured GPS points, the accuracy of the land cover data is 80. 4%; (2) Landscape ecology, G1S and statistical ideas and methods can support quantitative analysis on land cover spatial characteristics. The indices used in the patch area, patch shape index, adjacency index of different land cover types reflect the land cover spatial characteristics of the Poyang Lake region in different aspects; (3) Landscape indices can quantitatively explain the shape, size, number and space combination of the land cover and can reflect the characteristics of the ecological environment and the status of human activities and socio-economy. The area indices has showed that the rural settlement have the highest degree of fragmentation and dispersion. Shape indices have reflected the shape of the water body tend towards the regularization owing to the conversion from lake to land and the flood control projects; And (4) the adjacency indices of land cover types have quantitatively descripted the material exchange, interaction of the adjacent land cover types and have reflected the formation mechanism and succession process of land resources. The adjacent relationship of paddy fields and evergreen broadlcaf forests have reflected that the deforestation has influenced the succession of forest land and paddy field. The adjacency relationship of paddy fields and rural settlements has recommend that farmland protection and monitoring should be focused on farmland surrounding the towns and rural areas. The adjacency indices of urban construction have provided a scientific basis for the construction of the towns. Analyses have showed that Poyang Lake is an arable land-based agricultural area, which has abundant water resources and forests, therefore, we should pay high attention to intensification of rural land use, water conservation, farmland protection, and the rational development and utilization of natural resources.
land coverstatus patternlandscape analysisPoyang Lake region
NETL
NSTL
万方数据
维普
