| With the deepening of global changes research, as an important part of it, land use / cover change(LUCC) has becoming a hot research topic. However, most previous research focused on economically developed plains and hilly areas, to less developed areas of the mountain, researches are extremely less. The mountain areas is one of the most sensitive regions of response to global change, and their ecological environment is increasingly subjected to human activity, to which LUCC is closely linked. Study area is located in the transition zone of the first and the second step of terrain, and its unique natural geographical pattern provides an excellent material to LUCC research. As important ecological barrier of the Yangtze River, look into its LUCC mechanism, providing reference for the regional environmental protection and sustainable utilization of land resources is of great significance.This paper based on remote sensing and GIS to extract land use / cover information of Erlang region in 1994, 2000 and 2009, based on which, LUCC Tupu was built. With LUCC Tupu, it analyzed the potential law of spatial and temporal change of land use and then explored changes'driving factors. The main conclusions are as follows:(1) Land use patterns: Woodland is widely distributed, but it's lack of arable land resources, contradiction between people and land is obvious. Land for urban, village and industrial and traffic land constitutes small proportion of the total land, which reflects less developed economies in this region. Other land's area is large, but most of which is distributed in high altitude, hard to be used(2) The amplitude of LUCC: From 1994 to 2009, garden plot changes the most among the eight land use types, whose amplitude is up to 97.49%; this is followed by traffic land and land for urban, village and industry, 43.04% and 36.70% respectively. Arable land and other land continued decreasing during the 15 years, the amplitude was -28.77% and -19.72. Amplitude of woodland and grassland is extremely small, only 2.52% and 2.16%. In the secondary land type of land for water and water facilities, the changes are very complex.(3) The direction of LUCC: Arable land mainly converts to woodland, garden plot, grassland and land for urban, village and industry; woodland mostly flows to other land and grassland; woodland and other land are in the main flow of grassland; land for urban, village and industry mainly flows of woodland; land for water and water facilities mainly changes to other land; other land mainly flows to woodland, land for water and water facilities, and grassland. During the 15 years, the main conversion types of this region are: conversions between other land and woodland, grassland, land for water and water facilities; flows from arable land to woodland, garden plot, grassland, and land for urban, village and industry.(4) Aspect differences of LUCC: It's of the same change trend between the eastern and western slope (except grassland), but there are some differences in change speed. The change speed of garden plot, grassland, land for urban, village and industry, and traffic land is faster in western slope than in eastern Slope, the rest land types'slower. The main conversion types are almost of the same in east and west slope, the difference is: arable land - grassland and arable land - land for urban, village and industry are the main conversion types only in east slope, while the conversion of other land to land for water and water facilities only in west slope; in addition, the percentage orders of main conversion types are different in different slope: in east slope, the largest type is arable land - woodland, while other land– woodland in western slope, which, to some extent, reflects that there are differences in the role of climatic conditions and human activities on LUCC between east and west slope.(5) The natural and human driving factors: The driving role of climate on the LUCC is more significant in the high altitude: the area of conversion between grassland, bare land, and shrub land, between bare land and permanent snow and glaciers is large. Terrain factor determines basic distribution pattern of land use, and limits the development of certain land type to some extent. Natural disasters and serious soil erosion brings sudden changes for land use. Population growth and socio-economic development are the root causes of construction land's growth. The government's macroeconomic policies made a great deal of arable land into woodland, the area of forest coverage increased. More economic benefits is the main reason for changing from arable land to garden plot.(6) Sustainable development strategy of land resources in study area: ecology should be developed first; intensive land conservation mechanism should be established and arable land resources should be strictly protected; in order to spur economic development in this region, competitive industries should be developed. |
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