Study On The Changes Of Historic Paleoclimate And Paleoenviroment And The Man-Land Relationship Of Southern Xinjiang

Study on the Changes of Historic Paleoclimate and Paleoenvironment and the Man-Land Relationship of Southern Xinjiang Study on the Changes of Historic Paleocliniate and Paleoenvironment and the Man-Land Relationship of Southern Xinjiang ABSTRACT Southern Xinjiang lies in the hinterland of Eurasia continent. Because of its special geographic surroundings and the bad natural environment, it is difficult to obtain the proxies indicating its environmental evolution. And there are difficulties in expounding the environmental evolution of southern Xinjiang and the characteristics of human activities comprehensively. During studying, we get the relatively pleasing sedimentary profile ?the Niya profile by many inspections on the spot. By the analyses of the different environment proxies (such as geochemical elements, sporo- pollen, susceptibility, stable carbonate isotope of sediments) and the archaeological document, records in history and the studying results in the near regions by other people, we draw the conclusions in several aspects about the study on the changes of historic paleoclimate and paleoenviroment and the man-land relationship of southern Xinjiang: (1) Because the climate and environment of southern Xinjiang is atrocious, the perfect object of study is scarce. But in the sediments in some lakes and rivers, the records of the environmental change are more integrity (such as Niya profile, Bosten lake profile), so the study of the environmental change in the south of Xinjiang could go on wheels. (2) Since the historic time (especially since 4000 aB.R), the climate and environment has experienced a series of cold-warm and dry-moisture changes. It was obvious that the climate and environment had the tendency of drought after the Maximum optimum period of Holocene. Under the background of it, there were still many fluctuations: 4.0 kaB.R 3.45 kaB.R, climate was generally inclined to be moisture with the passable water condition. There was the tendency of drought at the later stage; 3.45 kaB.R ?2.50 kaB.P., temperature rose, and the climate became dry. It appeared to be the characteristics of warm-dry climate; 2.50 kaB.P. ?1.90 kaB.P., it was cold-moisture with relatively optimal water condition, which was beneficial to the growth of crops. 1.90 kaB.P ?1.40 kaB.P., relative warm-dry, the conditions of iv the climate and environment relatively worsen. 1.40 kaB.P. ?1.00 kaB.P., temperature descent, and precipitation increased. There was a good combination of thermal and hydrological region. 1.00 kaB.P. ?0, it was dry in climate mainly, with several cold- warm fluctuations. (3) The study has revealed that since Holocene, in southern Xinjiang the pattern of environmental evolution was the alteration of relative cold-moisture and relative warm-dry on the millennial scale, differentiating from the region of eastern monsoon in China. And generally, the southern Xinjiang appeared to be relatively cold- moisture compared with the cold-dry in the eastern region of China, and relatively warm-dry compared with the warm-moisture in the eastern region of China. The main difference appeared to be the collocation pattern, which was the synchronism of cold and warmth and the different charac...