关键词: 土地利用, 土地利用变化, 空间分布, 北京市

Abstract:

Land use change is a key component for global environment change, and a representation of the impact of human activities on physical environment Supported by the 1 km grid global database, IGBP, IHDP and other international organizations have implemented a series of researches including land cover dynamics, mechanism and global and regional models The 1 km grid data is an effective way of data integration, which can promote regional land use change monitoring, predication and driving forces analyses This paper, based on remote sensing,GIS and Landsat TM digital images, analyzed the structural features and spatial patterns of land use change in Beijing from 1985 to 2000 The primary findings show that conspicuous conversion, with a rate of 40 78% and 37 60% respectively, occurred for woodland and built up areas with internal conversion of woodland, conversion from woodland to grassland, internal conversion of built up areas and afforestation or grassland restoration in abandoned mining land as its main conversion categories At the same time, the net change of each kind of land use is characterized by conspicuous areal differentiation The decrease of dry land of central eastern and southern Beijing, 129,874 17 hm 2 in total, is dominant and conspicuous while that of northeastern by sparse distribution The increase of arable land, dominated by paddy field is sparsely distributed in northern and central western Beijing Forest area trends are enlarging in spatial distribution, especially in protection forest of Northeast, North and Northwest China and mountainous areas of southwestern Beijing The decreased area of grassland is almost 6 times of the increased. The former happened chiefly in mountainous areas while the latter in reused arable land or grassland areas For a long time series during 1985～2000, the trend of water body expansion obviously occurred in central western, southeastern mountainous areas and some reservoir areas of northern and eastern Beijing Above all, the most conspicuous feature of land use change in Beijing for the past 15 years is still urban expansion, undoubtedly affected by the macro social and economic conditions in China, which is densely distributed in central eastern and central southern Beijing and expanded around the downtown as well as around the towns of each county in Beijing These findings promote our understanding of land use change and contribute to the decision-making of local governments

Key words: land use, land use change, spatial distribution, Beijing