青藏高原东缘贡嘎山地区土地利用与景观格局演变

根据1995年和2000年土地利用数据，运用ArcGIS 8.1软件和景观生态学方法，研究了青藏高原东缘贡嘎山地区的土地利用变化和景观格局变化. 主要结果如下:①1995—2000年间，研究区土地利用变化显著，其中林地、水域和未利用土地面积下降，而草地、耕地和建设用地面积增加；②景观破碎化程度加剧，分维数、多样性指数和景观破碎度均增加；③建设用地和未利用土地优势度变化不大，耕地和林地的优势度减小，草地和水域优势度增加， 表明研究区景观格局由耕地、林地向草地和水域转变； ④交通干线（公路）附近的土地利用和景观格局变化显著，加强这些区域的生态环境保护与建设势在必行. 

Changes of land use and landscape patterns of the Gongga Mountain area on the eastern edge of Qinghai_Tibetan Plateau

Based on digital land use data from 1995 to 2000, the land use and landscape pattern changes of the Gongga Mountain area on the eastern edge of the Qinghai_Tibetan Plateau were studied on a macro_scale using ArcGIS 8 1 and landscape ecology methods. The results are as follows: 1) great changes have taken place in land use and landscape pattern from 1995 to 2000; the area of woodland, water and unused land has been reduced and that of grassland, cropland and construction land increased; 2) the advance of fractal dimensions, the diversity index and landscape fragmentation degree showed that landscape units became strongly fragmented; 3) the dominant degree of construction and unused land has changed little but that of meadow and water increased, and that of farmland and woodland decreased to some extent, which indicated that the trend of landscape pattern changed from cropland and woodland to meadow and water; 4) the changes of land use and landscape patterns near the road are obvious and it is urgent to strengthen eco_environment protection.