Holocene Climate Change In The Ebinur Lake Wetland, Xinjiang, China

At present, the global environmental change has become the focus of common concern in all fields.Due to the deterioration of the global environment in recent years, it is urgent for us to study the law of environmental change.Pollen as an important indicator of the restoration of palaeovegetation and palaeoclimate,for us to understand environmental evolution process, solutions to today’s environmental problems has important significance,can effectively guide the future of human activities.On the bisis of stratigraphic section in northern Xinjiang, Ebinur Lake Wetland,combining with the data of pollen assemblages of 33 modern pollen samples,where were collected Charles Hilary Nature Reserve,that is the results of the study on different altitude profile of pollen,and the multi index analysis,such as size characteristics and chronologic datings,the climate changes and paleovegetation since Holocene can be reconstructed.As the result,the surface samples is divided into three pollen zones,mountain forest belt,mountain steppe zone and mountainous steppe desert belt.Our data feature display that the ancient climate evolution since Holocene in Ebinur Lake Wetland. During 14.3-12.6ka B.P., Ebinur Lake Wetland showed veld vegetations for the pollen assemblages of large trees and herbs.This stage of Pinus and Betula pollen and fern spore percent content was higher,characterized by warm and wet climate during warm events in global intermittent.During 12.6-8.3ka B.P., Pollen assemblages including herbs,trees was second, showed the grassland landscape. The early stages of decreasing trees,a small amount of Picea,increased Chenopodiaceae and reduced ferns is cold and drought in the period of Younger Dryas.At the last of this stage reflected cold climate,but the rise in temperature lead to an increase in the mountains of snowmelt and lake water increased to lake level.The climate suddenly became cold in 8.26 ka B.P.,which predecessorshave documented in many studies. 8.3-3.1ka B.P., The climate evolution from warm-humid to warm-dry,corresponded to the Holocene warm period.Late in the 3.1-0.9ka B.P., warm climate and increased ferns, corresponded to the Medieval Warm Period.At this stage,we thought Ebinur lake water level rose.Since 0.9ka B.P, Plant small and bad weather.Due to the low profile resolution,the "Little Ice Age" reflected not obviously.But the ferns was rising in this period,roughly consisted with the matter that the Ebinur lake water level rose in the "Little Ice Age",mentioned in previous studies.During the last 200 years, the climate was relatively dry, which is similar to the modern climate.Ebinur Lake as a sensitive area of climate, sediment can more complete record of the evolution of the global climate characteristics, so understanding the evolution process of the environment of the area will help us in the future know how to respect nature, protect nature, in harmony with nature, and common development to sylvosteppe.