Study on the Variation of Landscape Pattern under the Influence of Hydroelectric Development: A Case Study of Madushan Hydropower Station, China

Based on 3S Technology, this paper mainly focuses on studying temporal dynamic changes of landscape pattern in the upper reaches of the Madushan of Yunnan Province before and after the construction of Madushan hydropower station. From 2006 to 2011, the woodland area showed a downward trend, while those of some savanna, cropland, bench land, residential land, transportation land and industrial land were in adverse circumstances. The woodland area dropped from 1374.37km 2 to 1230.88 km2 by 10.4% compared to 2006. The water area increased from 6.99 km2 in 2006 to 11.72 km2 in 2011. What's more, some inter-transitions between different landscape types were also frequent, especially for woodland, cropland and savanna. Actually, the integrated variation of landscape degree was 6.2%. And all the landscape types presented a growing trend except for woodland. The fastest trend was 26.3% in industrial land, the slowest trend was 0.4% in cropland. In conclusion, there was an apparent change in the landscape pattern for the study area before and after the hydropower station construction, and this study could be significant for better understanding of the landscape ecological effects of hydropower exploitation.