| The change on land-use is an important part and one of the main reasons of global environmental change. Since entering the new century, the research on land-use change has been the frontier and the hot topic of the researches on related geographical subjects. One of the important reasons of environmental change is land-use, and land-use has been dominated by many factors, so the study of the relationship between land-use change and its driving force reveales the need of its law becoming a reality.Choosing the western end of Horqin Sandy land--Wengniute Banner of Chifeng City as the study land, with the support of remote sensing, GIS technology and mathematical statistical methods, and using TM images and DEM data of Wengniute Banner in the year 1989,2000 and 2006 as the main data source, this paper made a status analysis on land-use of Wengniute Banner, and analyzed the dynamic changes of land-use in the years between 1989-2000 and 2000-2006. Based on the detailed analysis of changes in quantity and speed of DEM land-use, this paper also pointed out the main driving factors of land-use change in that area and provided important scientific evidence for puting forward reasonable countermeasures for the sake of sustainable use of land resources and sustainable economic and social development of that area(Banner).The main conclusion of the study in this paper are as follows:The status quo: a large area of arable land accountes for more than 30% of the total area for the study; more than 85% of the arable land distributes at slope land less than 8°; in 2006 there is still a part of cultivated land on steep slopes more than 25°, which should be returned to forests and grasslands; lawn is also a great area, accounting for more than 35% of the total study area; woodland area accountes for more than 10% of the total area for study; unused land area accountes for less than 20% of the total study area; waters and settling land are smaller, accounting for less than 5% of the total area for study. The distribution of land-use in > 3°of the ground is the most extensive and with the increase in slope the land-use is reduced; the distribution of construction land on sunny-slope is the largest, and the distribution of other land-use types is the most widely on shady-slope, reducing in the order of shady—sunny—semi-shady—semi-sunny; the distribution of farmland in the year 1989 and 2006 on the southern slope is greater than in the northern slope, while in 2000, the distribution on the northern slope is larger than on the southern slope; farmland, woodland and building sites are most widely distributed in the 585-885m high land, and the distribution of other land-use types increases with the height reduction.Dynamic Change: (1) During 1989-2000 years, the cultivated land, grassland and settling land increased, but woodland, water area and unused land reduced. Woodland changed into arable land or grassland; grassland turned into arable land; unused land altered to grassland; arable land and grassland alternation are mainly internal conversion; water land changed into arable land; the major source of construction land is from arable land; During 2000-2006 years, woodland, grassland and settling land increased, while arable land, water area and unused land reduced. Arable land mainly changed into woodland or grassland; grassland mainly turned into forest land; unused land changed into grassland or forest land; arable land and grassland alternation are mainly internal conversion; water land mainly changed into arable land; the major source of construction land is from arable land or grassland. (2) Rate of change on various land-use types between years 2000-2006 is greater than the rate of change (with the exception of arable land outside the small rate of change) between years 1989-2000, but these two phases of change on land-use types belong to extremely slow change type. (3) From the extent of changes on land-use, in the years between 1989-2000, the extent of land-use is strengthened and the years from 2000 to2006 are an adjustment period. (4) Overall , the land-use change of the years between 1989-2000 is not conducive to the study of environmental protection and ecological construction, while the land-use change between 2000-2006 is in favor of the restore and protection of the ecological environment, though still accompanied by part of the destruction.DEM-based land-use change: land-use change is reduced with the increase of gradient; more than 97% of land-use changes happen at the region where slope is less than 15°, which shows that this region belongs to the most active areas of human activity; during the years 2000-2006, there is also arable land at the steep slopes whose gradient is more than 25°, which shows that eco-environmental restoration and protection should be more strengthened. Change on the shady slope is greater than that on the sunny one, and change on the semi-shady slope is more than that on the semi-sunny one; except the water area which has the biggest changes on the sunny slope, other various types of land-use change reduces basically in the order of shady-sunny-semi shady-semi sunny slope; if the slope is divided into the southern slope and the northern slope area, the change on northern slope is greater than that on the southern slope. Cultivated land and forest land changes are the greatest at the 585-885m high area, while other types of land-use change increases with the height reduction, and land-use change mainly concentrates in the <1185m region. The speed of land-use change is reducing with the increase of gradient and height. The effect of the gradient on land-use change is not too much and the speed of land-use change has certain degree of particularity. when the research time is different.Impact factor: natural factors are climate, topography and soil; human factors include policy factors, population factors and economic factors. Land-use change is the result of combined effects of natural factors and human factors. Natural factors on land-use change have a long-termeffects and those are the background factors of land-use change, while human factors often have decisive impact on land-use change and those are the most important inducing factor. |
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