Chinese deserts and sand fields in Last Glacial Maximum and Holocene Optimum  

作　　者：LU HuaYu YI ShuangWen XU ZhiWei ZHOU YaLi ZENG Lin ZHU FangYing FENG Han DONG LiNa ZHUO HaiXin YU KaiFeng MASON Joseph WANG XiaoYong CHEN YingYong LU Qi WU Bo DONG ZhiBao QU JianJun WANG XunMing GUO ZhengTang 

机构地区：[1]School of Geographic and Oceanographic Sciences, Institute for Climate and Global Change Research, Nanjing University [2]College of Tourism and Environment, Shaanxi Normal University [3]Department of Geography, University of Wisconsin Madison [4]Institute of Desertification Studies, Chinese Academy of Forestry [5]Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences [6]Institute of Geology and Geophysics, Chinese Academy of Sciences

出　　处：《Chinese Science Bulletin》2013年第23期2775-2783,共9页

基　　金：supported by the Global Changes Program of Ministry of Science and Technology of China(2010CB950203);the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA05120704);the National Natural Science Foundation of China(40930103 and 41021002);China National Science and Technology Basic Work Program(2006FY110800 and 2012FY111700)

摘　　要：The Last Glacial Maximum (LGM, c. 26-16 ka) and the Holocene Optimum (HO, c. 9-5 ka) were characterized by cold-dry and warm-wet climates respectively in the recently geological Earth. How Chinese deserts and sand fields responded to these distinctive climatic changes is still not clear, however. To reconstruct environments of the deserts and sand fields during the LGM and HO is helpful to understand the forcing mechanisms of environment change in this arid region, and to test paleoclimatic modeling results. Through our long-term field and laboratory investigations, 400 optically stimulated luminescence (OSL) ages and more than 100 depositional records in the Chinese deserts and sand fields were obtained; on the basis of these data, we reconstruct spatial distributions of the deserts and sand fields during the LGM and HO. Our results show that the sand fields of Mu Us, Hunshandake, Horqin and Hulun Buir in northern and northeastern China had expanded 25%, 37%, 38% and 270%, respectively, during the LGM; the sand fields of Gonghe in the northeastern Qinghai-Tibetan Plateau had expanded 20%, and the deserts of Badain Jaran, Tengger in central northern China had expanded 39% and 29% separately during the LGM; the deserts of Taklimakan, Gurbantünggüt and Kumtag in northwestern China had expanded 10%-20% respectively, compared to their modern areas. On the other hand, all of the sand fields were nearly completely covered by vegetation during the HO; the deserts in northwestern and central northern China were reduced by around 5%-20% in area during this time. Lakes in this arid region were probably expanded during the HO but this conclusion needs more investigation. Compared with the geological distributions of deserts and sand fields, human activity has clearly changed (expanded) the area of active sand dunes at the present time. Our observations show that environmental conditions of Chinese deserts and sand fields are controlled by regional climate together with human activity.The Last Glacial Maximum （LGM, c. 26-16 ka） and the Holocene Optimum （HO, c. 9-5 ka） were characterized by cold-dry and warm-wet climates respectively in the recently geological Earth. How Chinese deserts and sand fields responded to these distinc- tive climatic changes is still not clear, however. To reconstruct environments of the deserts and sand fields during the LGM and HO is helpful to understand the forcing mechanisms of environment change in this arid region, and to test paleoclimatic modeling results. Through our long-term field and laboratory investigations, 400 optically stimulated luminescence （OSL） ages and more than 100 depositional records in the Chinese deserts and sand fields were obtained; on the basis of these data, we reconstruct spa- tial distributions of the deserts and sand fields during the LGM and HO. Our results show that the sand fields of Mu Us, Hun- shandake, Horqin and Hulun Buir in northern and northeastern China had expanded 25%, 37%, 38% and 270%, respectively, during the LGM; the sand fields of Gonghe in the northeastern Qinghai-Tibetan Plateau had expanded 20%, and the deserts of Badain Jaran, Tengger in central northern China had expanded 39% and 29% separately during the LGM; the deserts of Taklimakan, Gurbanttinggtit and Kumtag in northwestern China had expanded 10%-20% respectively, compared to their modem areas. On the other hand, all of the sand fields were nearly completely covered by vegetation during the HO; the deserts in north- western and central northern China were reduced by around 5%-20% in area during this time. Lakes in this arid region were probably expanded during the HO but this conclusion needs more investigation. Compared with the geological distributions of deserts and sand fields, human activity has clearly changed （expanded） the area of active sand dunes at the present time. Our ob- servations show that environmental conditions of Chinese deserts and sand fields are controlled by regional climate together with human activity.

关 键 词：沙漠环境 中国北部 适宜期 全新世 末次冰期 末次盛冰期 库姆塔格沙漠 干旱地区 

分 类 号：P534.632[天文地球—第四纪地质学] P532[天文地球—古生物学与地层学]