Study On The Resources Variety Track And Ecological Carrying Capacity On Lan Tian Area In The Last 30 Years

With the development of economy and the increasing of population, problems of resources shortage and environment deterioration have around the global concern and attention. Therefore, how to achieve and keep the balance and harmony between the Ecological Carrying Capacity and social economy development is focus,which plays an important role in understanding the effects of local and global resources exploitation on ecological environment. For instance,in the last 30 years,the phenomenon of destroying ecological environment also existed in the north slope of Qin Ling Mountains, because of unreasonable using of natural resources. Thus ,based on the research on resources exploitation to the ecosystem environment in the north slope of Qin Ling Mountains during the last 30 years, Lan Tian County is selected as the research object. In this thesis,the change course of natural resources and Ecological Carrying Capacity are deeply discussed in order to give an useful reference to the local government.First of all, focusing on the whole area of Lan Tian County and subareas around it, which the check of ground reference and field study. We've carried on the indoors analysis by using the mathematics system. We made the space-time course line of the land resources, water resources and forest resources. And then ,we've carried on their trend analysis and related analysis.Secondly, we've applied for some mathematics assistance and calculator software (such as Excel, the Arcview and MATLAB) to establish mathematical model according to the Ecological Carrying Capacity theories.Thirdly, we've calculated and analyzed each kind of Ecological Carrying Capacity of various resources in these districts.Fourthly, using the comprehensive evaluation method of Ecological Carrying Capacity, we've gotten the comprehensive system resilience degree of each district, the resource carrying index and the resource pressing index of each district;Finally, according to the classification standards of Ecological Carrying Capacity, we've gotten comprehensive evaluation result and put forward some suggestions about resources exploitation in Lan Tian County.The results are as follows:1. In the last 30 years, the cultivated area in Lan Tian County was decreasing year after year, the lawn area was decreasing too, the woodland area and the garden area were increasing, the other land such as residential area, industrial and mining area, crude land area were rising steadily, the natural land area kept on ascending. The annual runoff of the Bahe river descended continuously. At the same time, the water resource of per capita was declining. The consumption of water in industry, agriculture and households-use water were increasing in the subarea of Lan Tian County, and the supply and demand was unbalanced. The area of artificial forestation, forest cover rate and forestry land were increasing steadily, but trees along the road and field were reducing greatly.2. During the last 30 years, the Pressure Degree of land resources in Lan Tian County showed a decreasing trend year by year;Resources Carrying Capacity of land in most of villages and towns belonged to medium carrying;The Pressure Degree of water resources in subarea of Lan tian County were increasing. Water shortage occurred in Qin Ling Mountains, loess tableland district and the mound hills area. Moreover, the Pressure Degree of forestry resources and tourism resources were descending and turned to benign development gradually.3. According to the comprehensive evaluation of the Ecological Carrying Capacity, we got the following conclusion that Lan Tian county as well as Xi'an city belongs to the medium stable, medium carrying and high pressing district. Drainage district belongs to the medium stable, superior carrying and strong pressing district. Loess tableland district belongs to the medium stable, low carrying and high pressing district. Hills district belongs to the medium stable, weak carrying and high pressing district. Qin Ling Mountains in Lan Tian area belongs to the medium stable, superior carrying and high pressing districts.