A 94-10 ka pollen record of vegetation change in Qaidam Basin, northeastern Tibetan Plateau
文献类型：SCI/SSCI论文
| 作者 | Wei H. C.; Fan, Q. S.; Zhao, Y.; Ma, H. Z.; Shan, F. S.; an, F. Y.; Yuan, Q. |
| 发表日期 | 2015 |
| 关键词 | Pollen record Climate change Qaidam Basin Late Pleistocene Tibetan Plateau (TP) east-asian monsoon qarhan salt lake late quaternary surface pollen inner-mongolia western china northwest china climate-change qinghai lake bolivian altiplano |
| 英文摘要 | Drill core (ISL1A) was obtained from the Qarhan Salt Lake in central eastern Qaidam Basin, northeastern Tibetan Plateau (NE TP). Fossil pollen and the lithology of the core sediment were analyzed in conjunction with AMS C-14 and Th-230 dating. The results indicated that Artemisia and Chenopodiaceae dominated the steppe/desert steppe vegetation developed around the lake between 94 and 51.2 ka, corresponding with the organic-rich silty clay deposited in the core sediments. Pediastrum continuously appeared in the core sediments between 94 and 51.2 ka, indicating freshwater to oligohaline conditions of the paleo-Qarhan Lake during the late marine isotope stage (MIS) 5, MIS 4, and early MIS 3. During the 51.2 to 32.5 ka period, Ephedra dominated shrub-desert vegetation expanded in the basin, while, Pediastrum disappeared in the core sediments. The core sediments consisted of interbedded layers of halite silt and clay-rich halite between 51.2 and 32.5 ka, signifying a shift toward drier hydrologic conditions. Thus, the paleo-Qarhan Lake experienced periods of desiccation and shallow water levels. Artemisia and Chenopodiaceae dominated steppe/desert steppe vegetation appeared again from 32.5 to 253 ka, with clay-rich sediments in the core, thereby suggesting an increase of runoff from the lake under relatively wetter climatic conditions. Since 253 ka, however, pollen concentrations declined, corresponding with the amount of halite deposited in the core sediment and, suggesting a cold, dry climatic condition during MIS2. Our findings have important implications for understanding complex regional vegetation and climatic responses to large-scale forcings in the Qaidam Basin. (C) 2015 Elsevier B.V. All rights reserved. |
| 出处 | Palaeogeography Palaeoclimatology Palaeoecology |
| 卷 | 431 |
| 页 | 43-52 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0031-0182 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/38941]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Wei H. C.,Fan, Q. S.,Zhao, Y.,et al. A 94-10 ka pollen record of vegetation change in Qaidam Basin, northeastern Tibetan Plateau. 2015. |
入库方式： OAI收割
来源：地理科学与资源研究所
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