Hexi Corridor Of National Change And Ecological Evolution

It is a complicated problem of the history of national vicissitudes in Hexi Corridor. A large number of nationalities rose in different times and they mingled with each other. No one can calculate how many nationalities exised in this place. On the other hand,the clue of national vicissitudinous tendency is clearly. At a long time before early stage of Ch'in dynasty, some nationalities existed one after another or coexisted. After Han Dynasty Emperor Liu che seized this area, large amounts of people in central plains of China were settled in while the former nations like Hun were forced to outmigrate. The Han nationality became the major part and the land was reclaimed for agriculture. And the tide of immigration extremely complicate the situation from later period of The Last Han Dynasy to Sui and Tang dynasty . The Han nationality were slaughtered or assimilated when they were invaded by nomad for lacking support of the government,and the population sharply declined. At the same time,one of the most remarkable change was the revival of the pastoral economy when the nation of Xianbei entered in from south and north. During the four hundren years, two of the most influential nations were Lushuihu and Xiutuge ,the descendants of the Hun. After the Sui and Tang dynasty set up,the central government recontroled Hexi Corridor and the Turkestan relying on its mighty power,and the Han nationality massively entered in once again,therefore the agricultural economy had been recovered and developed,and the social system we're rebuilded. After the mid-eighth century,for the powerful transform between and the got the domination,and this area entered a Tbetize era. The agricultural social system collapsed.Later,and other nomad took control one after another until late-fourteenth century. The Ming dynasty not only controled but also exploited its mid-easten part,and this operation lasted more than 600 years. From then on,the central government took the control all along,and made policy to encourage people to be there. Owing to their exploitability for 600 years,the Hexi Corridor has now been a paradise for agriculture nation..Any tribe or nationality who wants to exist and develop itself should find the proper way to use and exploit the local resources,such as the land and water In another words,a exploitable mode is up to a certain environment. All people'activity is controlled by the natural environment. When people are familiar with one mode,they tend to keep it in other different situations. The nomad would not farm at once when they came in the agriculture area, and vice versa. The contest between agriculture nationalities and nomad is for the special location and natural resoures in Hexi Corridor. For different nationalities carried out different usage modes,it inevitably caused the alternant exploitative model in its history. Though to a certain extent people can freely exploit natural resources for their own sake, the latitude depends on the ecological condition.The environment is weaker,the extent is narrower. People can not exploit to a great degree for its extreme friability. So the alternant exploitation brought by the varying nations would inevitablely caused the change of natural condition. The Hexi Corridor locates in the semiarid and arid region. People always thought it was suitable for agriculture as well as nomadism,it is totally wrong. The history experience illustrates that the usage of natural resource only can be graziery.