LI Yan-li 1, 2 , XU Zong-xue 1 , LI Yan-fen3
(1. College of Water Sciences, Beijing Normal University, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100875, China;
2. Institute of Resources & Environment, Henan Polytechnic University, Jiaozuo 454000 ,China；
3. Institute of Chemical and Environment Engineering, Jiaozuo College, Jiaozuo 454000, China)
Abstract: On the basis of TM remote sensing images in 1990, 2000 and 2005, the landscape pattern changes of four aquatic ecoregions (level I)in the Liao River Basin from 1990 to 2005 were analyzed by using GIS technology, as well as the methods of transfer matrix, and landscape metrics. The results indicated that the area decreasing most significantly is cropland in aquatic ecoregions I and Ⅱ, and most of the croplands were changed to woodland and grassland from 1990 to 2000, the area decreasing most significantly is grassland, and most of the grasslands were changed to cropland from 2000 to 2005 in the same region. The area decreasing most significantly is cropland in aquatic ecoregion Ⅲ, Most of the croplands were changed to woodland from 1990 to 2000, and most of the woodlands were changed to cropland and construction land from 2000 to 2005. The Hun and Tai River basins are included in aquatic ecoregion Ⅳ, the area decreasing most significantly is cropland in the Hun River and Tai River basins. Most of the croplands were changed to woodland and construction land in the Hun River Basin and to woodland from 1990 to 2000, the area decreasing most significantly is woodland, and most of the woodlands were changed to cropland. The landscape shape, heterogeneity and fragmentation in the Liao River Basin were enhanced to some extent, the fragmentation of the land for construction was largest and increased from 1990 to 2005, Cohension and AI tended to be improved from 1990 to 2005 in ecoregionsⅠand Ⅱ, Patch Cohesion Index(COHESION) and Aggregation Index(AI) in 2000 were largest in ecoregions Ⅲ and Ⅳ, SHDI and SHEI did not change obviously from 1990 to 2000 and increased from 2000 to 2005 in ecoregionsⅠ,Ⅱand Ⅳ, Shannon’s Diversity Index(SHDI) and Shannon’s Evenness Index(SHEI) in 2000 were largest, there were not obvious difference in SHDI and SHEI between 1990 and 2005.
Key words: land use; landscape pattern; transfer matrix; aquatic ecoregion; Liao River Basin
EARTH AND ENVIRONMENT Vol. 40, No.3, Tot No.289, 2012, Page 375-384