Journal
SCIENCE IN CHINA SERIES D-EARTH SCIENCES
Volume 48, Issue 5, Pages 676-688Publisher
SCIENCE PRESS
DOI: 10.1360/03yd0110
Keywords
Tibetan Plateau; Hexi Corridor; sporopollen record; ecological environment; vegetation evolution; aridification
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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 frequent occurrence of aridity during 6.93-6.64 Ma (steppe, semi-arid), 5.67-5.42 Ma (desert-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 and desert.
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