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With the deepening and development of the global change research, land-use change and its impact on the environment has become the hot topics of global change research. Differences due to the natural environment and human way of life, different parts of the double stress and pressure of the environment and development, showed a certain degree of vulnerability. By the the LUCC plan, people focus on the research focus to ecologically fragile areas of land use change and environmental effects up. From five angles of the natural, social, economic, technical and environmental vulnerability background of the northeast grass Ecotone, geology, geomorphology, climate, soil, vegetation and other natural factors the ecologically fragile basis of the study area and the potential factors irrational human activity is the dominant factor; ecological vulnerability accelerated in the late 1980s, the mid-1990s and 2005, three TM images of the source of information, combined with other survey data in remote sensing image processing software and support of GIS, Northeast grass ecotone land use classification data; precipitation, DEM, soil texture, soil organic matter, land use cover, ≥ 0 ℃ years of accumulated temperature greater than 6m / s the number of windy days and NDVI vegetation data source data, according to the \The sexual pattern dynamic analysis, and finally reveal the northeast grass ecotone ecologically fragile land use effects. Study found that The Northeast grass staggered area of ??land use types to forest and grassland, accounting for more than 70% of the study area; followed by arable land, accounting for 17% of the study area; small area of ??the other land use types; from the 20th century 80 in the late 2005 arable land has been in a state of growth, growth area of ??10315.72km to 2, urban and rural, mining, residential land area also have a small increase, other land use types tended to decrease, the largest decrease in grassland area, reducing 6794.02 km ~~ 2, the decrease in woodland area 2386.51 km 2. Northeast grass ecotone mainly mild fragile areas and moderate vulnerability zone, Daxinganling of the northern region and the fragility of the Songliao Plain, Inner Mongolia, the eastern part of the High Plains and the high vulnerability of the Yanshan Mountain, in the late 1980s to 2005 regional ecological environment deteriorating performance for the the slightly fragile area of ??a large number of steering moderately vulnerable area and intensity of fragile areas, reduced slightly fragile area vulnerable area of ??moderate vulnerability and strength. The direction of the deterioration of ecological environment: from the western high plains of Inner Mongolia east of the eastern margin of the Songliao Plain, from the south of Yanshan Mountain to the north Daxinganling region deterioration. Through the use of ecologically fragile land on coupling analysis: distribution characteristics of the degree of vulnerability of different land use types in the late 1980s a variety of land use types in the fragile area of ??mild and moderate vulnerability zone from 20 the mid-1990s, a variety of land use types in moderate vulnerability, strength fragile area was significantly increased; analysis from different ecological vulnerability types of land use distribution characteristics of micro fragile area waters, slightly fragile area and moderate vulnerable area of ??woodland, grassland and arable land, fragile strength main land use types never land turned to grass; 2005, in the late 1980s, a variety of land use types in ecological vulnerability index overall upward trend, types of land use eco-environmental degradation, unused the land ecological vulnerability index of the highest waters minimum; From the changes, waters, urban and rural, mining, residential land and grassland deterioration of the fastest, woodland deterioration of the slowest.
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