Pollen-inferred vegetation and environmental changes since 16.7 ka BP at Balikun Lake, Xinjiang

Shi Chen Tao, Chen Bang An, Fa Hu Chen, Ling Yu Tang, Zong Li Wang, Yan Bin Lü, Zhi Fei Li, Tong Ming Zheng, Jia Ju Zhao

Research output: Contribution to journalArticlepeer-review

59 Scopus citations

Abstract

A high-resolution fossil pollen record from the sedimentary cores of Balikun Lake, northwestern China, combined with modern surface pollen data, is used to reconstruct the history of vegetation and climatic change since 16.7 cal. ka BP. Fossil pollen assemblages and lithology indicate that the study area was dominated by desert. The desert had extremely arid climate and lower effective moisture during 16.7-7.9 cal. ka BP, especially from 16.7 to 8.9 cal. ka BP when the lake maybe dried up. During 8.9-7.9 cal. ka BP, the environment gradually recovered in this area. It was then followed by the optimum period from 7.9 to 4.3 cal. Ka BP, when the effective moisture obviously increased. It was characterized by the typical desert-steppe/steppe vegetation and was accompanied with several patch-birch woodlands around the lake. After that, a short but extremely arid climatic event occurred during 4.3-3.8 cal. ka BP, and the vegetation quickly changed from desert-steppe/steppe to desert. It was a relatively optimum period from 3.8 to 0.53 cal. ka BP showing typical desert-steppe/meadow-steppe landscape. Since 0.53 cal. ka BP, the climate has shown signs of deteriorating again. Furthermore, regional comparison shows that the characteristics of climatic and environmental evolution in this area were clearly different from East Asia monsoonal area during the last 16.7 cal. ka BP. It was characterized by the arid climate during the late-glacial and early Holocene, and relatively wet during the mid-late Holocene.

Original languageEnglish (US)
Pages (from-to)2449-2457
Number of pages9
JournalChinese Science Bulletin
Volume55
Issue number22
DOIs
StatePublished - 2010

Bibliographical note

Funding Information:
The authors thank Prof. Cao Jixiu, Dr. Jin Ming, Wei Haitao for field work and the conventional dating, Wan Hewen for pollen identification and Dr. Zhang Ke for pollen treatment, Dr. Huang Xiaozhong, Dr. Huang Changqing and Prof. Yan Zhao for polishing English. This work was supported by the National Natural Science Foundation of China (90502008, 40871006 and 40721061) and the Program for New Century Excellent Talents in University.

Keywords

  • Balikun Lake
  • Holocene
  • Xinjiang
  • climate
  • pollen
  • vegetation

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