The vegetation and climate change during Neocene and Early Quaternary in Jiuxi Basin,China |
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| Authors: | Email author" target="_blank">Yuzhen?MaEmail author Xiaomin?Fang Jijun?Li Fuli?Wu Jun?Zhang |
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| Institution: | 1. Key Laboratory of Western China's Environmental Systems and College of Resources and Environment, Lanzhou University, Lanzhou 730000, China
2. Key Laboratory of Western China's Environmental Systems and College of Resources and Environment, Lanzhou University, Lanzhou 730000, China;State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China |
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| Abstract: | 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. |
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| Keywords: | Tibetan Plateau Hexi Corridor sporopollen record ecological environment vegetation evolution aridific-ation |
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