Study On Driving Forces Of Different-scale Land Use Change In The Typical Karst Areas Of Guizhou

At present, the population-resource-environment problems of the world are increasingly outstanding, making the research on global environmental variation hotspot. And yet the research on land use and land cover change (LUCC) and its driving forces is important part of research on global environmental variation. The fragile karst environment and complex human-land ecosystem of Guizhou are the most typical in the world. With the rapid development of productivity and under population pressure and unreasonable economic activities, the fragile ecologic environment is deteriorating, along with many rigorous environmental and economic problems, in which, rocky desertification has become the most serious problem of ecosystem in karst areas.The former researches concentrating the present situation of rocky desertification, point out the basic reason of rocky desertification is unreasonable human activities. These researches lack further research on driving forces of land-use structure change in the areas with rocky desertification, so that it is hard to find out a common model of ecosystem rebuilding and sustainable utilization in the areas with rocky desertification.. On the basis of theories of human-land relation, and with systemic theory, land-use theory, and theories of sustainable development as the support, the paper, by means of hierarchy comparative analysis, integrating analysis and mathematical statistics, and based on the fieldwork, chooses three typical areas, Zhenfeng county, Beipanjiang town, Huajiang demonstration area as cases.Fromthe analysis and estimate of different land-use actualities and their characteristics and according to the model of land-use dynamic change, the paper, from different sides, analyses the dynamic laws of changes of quantity, structure and degree in different land-use states. Studying the factors of driving forces resulting in the change of land-use states (especially the infield). This paper tries to build a mathematics model of overall influence, and puts forward countermeasures to make a sustainable use of lands in special karst areas of Guizhou. This paper draws the following conclusions:Firstly, significant changes in the land-use have taken place during the period of research in the case sites. Change of quantity in the land-use, reflects mainly the increasing or decreasing changes between non-agricultural lands andagricultural lands, the range of which in Beipangjiang is the largest. From 1997 to 2000, the changing speed of land-use is faster than the one from 2000 to 2003, which reflects that the structure of agriculture is developing from the period of adjustment to the period of steadiness.In the change of land-use construction, in Beipangjiang, the increasing range of garden fields is the largest and the decreasing range of uncultivated lands is the largest. In Zhenfeng, the range of woodlands changes the biggest. The change of construction in Huajiang is similar to the one in Beipangjiang. In short, the changing range of index of land-use diversity in Huajiang is biggest, and the one in Zhenfeng is the second.In the change of land-use degree, the overall index of land-use degree is big,and the whole tend is in equilibrium. In short, the index in county class is bigger than the one in town class and the one in village class is the smallest. Beipangjiang is in the period of quick development, Huajiang in the period of common development and Zhenfeng in the period of slow development. The landscape deviation in three case sites has a trend of slow increase in regulation, which reflects the influence of land-use by human activities is being enhanced gradually.Secondly, driving factors in different dimensions are consistent on the macro level, which expresses land-use change is the result of them. But the main driving power of land-use changes, in different dimensions and in the different time, is different. The one in the dimension of county class is predominant in the developments of the second and third industries, and the one in the dimension of town cla...