Abstract:

Based on three sets of Landsat TM/ETM data(1990,2000 and 2008), and by techniques of remote sensing, geographical information system (GIS) and landscape ecology, this paper studied changes of land use and landscape pattern from 1990 to 2008 in Hongze Lake Basin. It revealed the spatiotemporal changes of land use in this basin, and drew the landscape type distribution, trends and features of landscape pattern change in the three periods. Results show that: (1) In past 18 years, land use in this basin changed significantly, which mainly manifested by farmland continuous decreases and the builtup areas rapid increases, secondly, woodland decreases after increasing, grassland and water slight increase, which were in an unbalanced state overall. (2) The landscape structure and landscape heterogeneity in Hongze Lake Basin changed greatly in this period. With increasing the degree of landscape fragmentation, diversity between landscape types is reduced and landscape structure tends to be uniform and reciprocal through increases of patch number, decreases of mean patch area, increases of Landscape diversity index and landscape evenness index totally. At last, the paper indicated that main driving force of land use and landscape pattern changes was human activities, especially economic construction, and put forward some suggestions on the ecological sustainable development of the basin