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The vegetation and cli{1.te change during Neocene and Early Quaternary in Jiuxi Basin, china

science china Earth sciences 2005年第5期 676-688页

作者： ma yuzhen 1 , fang xiaomin 1,2 , li jijun 1 , wu fuli 1 & zhang jun 1 1. key laboratory of western china’s environmental systems and college of resources and environment, lanzhou university, lanzhou 730000, china 2. state key laboratory of Loess and Quaternary Geology, Institute of Earth environment, Chinese Academy of sciences, Xi’an 710075, china

sporopollen record in the Laojunmiao section at Yumen in the Hexi Corridor foreland depression at the northern {1.rgin of the Tibetan Plateau revealed that during the period of 1..0―1..1. {1. the ecological environment... 详细信息

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.

关键词： Tibetan Plateau Hexi Corridor sporopollen record ecological environment vegetation evolution aridific-ation.

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