RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2017, Vol. 26 >> Issue (02): 227-237.doi: 10.11870/cjlyzyyhj201702008

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LAND USE FUNCTIONS DYNAMICS PATTERN OF CAOTANGXI WATERSHED IN THE THREE GORGES RESERVOIR AREA

YING Hong1,2, LI Yang-bing1,2   

  1. 1. College of Geography and Tourism, Chongqing Normal University, Chongqing 401331, China;
    2. Chongqing Key Laboratory of Earth Surface Processes and Environmental Remote Sensing in Three Gorges Reservoir Area, Chongqing 401331, China
  • Received:2016-07-21 Revised:2016-11-07 Online:2017-02-20
  • Supported by:
    Scientific and Technological Research Projects of Chongqing, China (No.cstc2015jcyjB0439)

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Abstract: The center of the Three Gorges Reservoir is a sensitive ecological environmental area, and red zone of reservoir water environment protection. The process of the Three Gorges Project, water impoundment operations and urbanization is always accompanied by land use changes in the center of Three Gorges Reservoir, including land use structure, land use function structure and ecological, economic, social attributes. Therefore, to explore the dynamics of land use functions in the center of Three Gorges Reservoir is one of the important approaches to promote the optimization of land use functions and sustainable land use development. Attempts have been made in Caotangxi watershed which has been selected as the study area. According to the difference of providing services by the land, the land use functions is divided into three classes and five second-class in this paper. Based on four period data and the 1:50 000 DEM, this paper analyzed the spatial and temporal dynamics of land use functions pattern of study area, by some means of the theory of GIS and landscape ecology, such as ArcGIS 10.2, Fragstats 4.2. The results showed that:In recent 25 years, ecological land which occupied the largest proportion of the whole area increased 1 541.96 hm2, while industrial land decreased 1 844.19 hm2 and living land increased 302.24 hm2. The land use functions change and relationships of biomass production function land and artificial/natural ecological function land played key roles in the whole network of land use functions change, and thus determined the characteristics of land use functions change in the study area. The spatial features of land use functions varied at different scales. From the perspective of spatial analysis, the regions near biomass production function land and artificial/natural ecological function land were hot spots of land use functions change. From 1990s to 2015s, the hot spot of land use functions change gradually transferred from east to west region. Biomass production function land, traffic function land and residential function land were mainly distributed in the area with low-medium terrain niche index, non-biological production land were mainly distributed in the area with medium-high terrain niche index, while artificial/natural ecological function land in high terrain niche index area. At a 25-year scale, landscape shape was complicated and landscape diversity was relatively high in the lower terrain niche index area. Conversely, the higher terrain niche index area has the characters of simplex, larger patches and less fragmentation.

Key words: land use functions, Three Gorges Reservoir Area, Caotangxi watershed

CLC Number: 

  • P209
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