Study On Comparison Between Vulnerabilization And Vulnerable Degree Of Environment Over Northernand Southern To Qinling Mount

The study on environmental vulnerability is one of the key fields of the study on global environment change. To this day, there has been so few studies on Degree and Process of environmental vulnerability. Studies both at home and abroad pay much more attentions to conceptual definition, while case studies are seldom involved. Although there are some means to measure vulnerable degree of environment, no model, as yet, has been established that is of accuracy and can be generally accepted. As a result, models and simulations of Degree and Process of environmental vulnerability remain to be studied further from different space-time scales.The climate system is changing across the globe. In response to climate change, many environmental systems are also likely to change. The question remains: how much, where, and whether the effect would be positive or negative. How do we aim at evaluated areas so as to assess the degree and the trend of the effect quantitatively or semi-quantitatively? The above-mentioned problems are pressing in the study on environmental vulnerability.This paper elaborates the background of the study on vulnerabilization and vulnerable degree of environment, and then sums up the methods of assessing vulnerable degree of environment quantitatively or semi-quantitatively. Two models are put forward to assess vulnerable degree of environment. One is the method of secondary fuzzy comprehensive evaluation and the other is the method of weighting score. Model of assessing vulnerabilization is established by rate of change of the time-developing slope of vulnerable degree. This paper takes the Southern Shaanxi and the Central Shaanxi Plain as the object of the study. leased on the data from hydroclimatological departments, this paper makes further analysis on the space-time structure of vulnerabilization and vulnerable degree of environment over northern and southern to Qinling Mountains by usmg the methods of geographical-information-system spatial analysis and mathematical statistics.By analysis, this paper makes some important conclusions. In east Asia Qinling is the highestmountains concerning altitude and of great importance in environmental change worldwide. It is of typicality to single out the Southern Shaanxi and the Central Shaanxi Plain, which lie separately in the south and the north to Qinling, as the object of this study so as to make a comparison between the vulnerable degree of environment. This paper is an important part of the study of the response of regional environment change to globe change. The vulnerable degree of environment over the two regions has been increasing in recent 50 years. It shows an outstanding geographical implication in terms of spatial distribution. The Central Shaanxi Plain is more vulnerable than the Southern Shaanxi, in general. In particular, the decadal amplitude of vulnerable degree of environment over the Plain is bigger than that over the South. The spatial distribution of vulnerable degree of environment over the Plain is more complicated. This spatial pattern of vulnerable regions reflects different characteristics of the landforms between the two regions. Forthermore, it also indicates that the environment over the Plain tends to be more strongly affected by the humanized activities. The dividing function is as follows. The static dividing function decreases and the dynamic dividing function seems to be striking. In recent 50 years, there exists a increasing trend of the vulnerable degree of environment over the two regions. Since the decadal amplitude of the vulnerable degree of environment over the Plain is bigger than that over the South, the environment over the two regions has a tendency of bipolar differentiation. This paper analyses the phenomena of environmental vulnerability change over northern and southern to Qinling Mountains. The causes of the change remains to be made a further study.