There is a the strong correlation of major land use transformation patterns with the timing and strength of subjectivity projects and their hysteresis effects when large-scale water conservancy projects (especially extra-large reservoir) constructed. The construction phase of Three Gorges Project in this paper was divided into five time points, considering the impacts of strong cloudy and foggy on image quality and its availability. The objectives of this paper was to comparatively understand the characteristics and trajectories of land use change the different project construction stages in the Three Gorges Reservoir Area through single land use dynamic degree, land use composite index, land use degree change, using five-term TM/ ETM image data. The results showed: (1) The transformation of cultivation land and forest-grass land, building land occupied cultivation land and forest land, interchange between forest and grassland, and cultivation land, forest land and grassland water flooded by water body were the main ways of land use conversion throughout the construction phase of the Three Gorges Reservoir Area. (2) Land use change and its drivers presented significant detailed trajectory with the stage under the framework of the overall pattern, due to the drivers occurring at different times, and the differences of their role strengthen degree during various construction stages. (3) The composite index of land use degree was relatively stable, and it was more than in the middle level throughout the construction phase. However, the change in land use composite index took overall on decreasing tendency with a "W"-type dynamic pattern. (4) The distribution breadth and concentration degree of major land use conversion patterns possessed larger differences at spatial scale. Moreover, the effects of subjectivity projects on major land use conversion patterns showed strong heterogeneity with the deepening of project construction phase. The results of this paper will contribute to rich the people's understanding to land use under the stress of water conservancy, and provide a scientific basis and reliable support to arrange adaptive land use regulation policy in the future.
SHAO Jing'an, ZHANG Shichao, WEI Chaofu
. Remote sensing analysis of land use change in the Three Gorges Reservoir area, based on the construction phase of large-scale water conservancy project[J]. GEOGRAPHICAL RESEARCH, 2013
, 32(12)
: 2189
-2203
.
DOI: 10.11821/dlyj201312014
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