The vegetation and climate change during Neocene and Early Quaternary in Jiuxi Basin, China

  • Yuzhen MaEmail author
  • Xiaomin Fang
  • Jijun Li
  • Fuli Wu
  • Jun Zhang


Sporopollen record in the Laojunmiao Section at Yumen in the Hexi Corridor foreland depression at the northern margin of the Tibetan Plateau revealed that during the period of 13.0–11.15 Ma the ecological environment of the Jiuxi Basin is characterized by steppe vegetation and a semi-moist climate. During 11.16–8.60 Ma prevailed forests of cypress and a still warmer, moister climate; steppe vegetation and dry climate began probably at about 8.6 Ma. Although aridification had been relaxed time and again during 8.40–6.93 Ma (forest-steppe, warm-semi-moist), 6.64–5.67 Ma (open-forest and steppe, warmer-semi-moist) and 5.42–4.96 Ma (steppe, semi-arid), the climate in the region became drier and drier in response to the fre-quent occurrence of aridity during 6.93–6.64 Ma (steppe, semi-arid), 5.67–5.42 Ma (de-sert-steppe, arid), 3.66–3.30 Ma (desert-steppe, arid) and 2.56–2.21 Ma (desert, arid). Perhaps the important findings of our study are the notable expansion of drought-enduring plants during 3.66–3.30 Ma and about 2.56 Ma and the replacement of vegetation by vast arid desert.


Tibetan Plateau Hexi Corridor sporopollen record ecological environment vegetation evolution aridification 


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Copyright information

© Science in China Press 2005

Authors and Affiliations

  • Yuzhen Ma
    • 1
    Email author
  • Xiaomin Fang
    • 1
    • 2
  • Jijun Li
    • 1
  • Fuli Wu
    • 1
  • Jun Zhang
    • 1
  1. 1.Key Laboratory of Western China’s Environmental Systems and College of Resources and EnvironmentLanzhou UniversityLanzhouChina
  2. 2.State Key Laboratory of Loess and Quaternary GeologyInstitute of Earth Environment, Chinese Academy of SciencesXi’anChina

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