Abstract: With the supports of RS and GIS, this paper studied the temporal dynamic changes of landscape pattern in Manwan Reservoir area of Yunnan Province before and after the construction of Manwan hydropower station. In the 30 years of 1974-2004, the areas of forest land and shrub land in the Reservoir area presented a decreasing trend, while those of grassland, farmland, constructive land, and water body were in adverse. Under the background of an overall landscape fragmentation and discrete distribution, there was a slight decrease in the landscape diversity and evenness after the construction of the hydropower station, but the landscape became more fragmented and more discrete. The inter-transitions between different landscape types were frequent, especially for forest land, shrub land, and grassland. The integrated landscape dynamic change degree decreased after the construction of the hydropower station, but a high degree of landscape dynamic change was observed for grassland, cropland, and constructive land. In sum, there was an obvious change in the landscape pattern in Manwan Reservoir area before and after the hydropower station construction, and this study could be meaningful for better understanding of the landscape ecological effects of hydropower exploitation.

Key words: Regeneration, Spatial heterogeneity, Forest dynamics