赵琳^1,,
鹿化煜^1,,,
唐领余²
1. 南京大学地理与海洋科学学院, 江苏省气候变化协同创新中心, 江苏 南京 210023
2. 中国科学院南京地质古生物研究所, 江苏 南京 210008

基金项目: 国家重点研究发展计划——全球变化及应对项目（批准号：2016YFA0600503和2016YFE0109500）和中央高校基本科研业务费专项资金资助（批准号：020914380066）共同资助


详细信息

作者简介: 赵琳, 女, 31岁, 助理研究员, 自然地理学专业, E-mail:linzhao@nju.edu.cn

通讯作者: 鹿化煜, E-mail:huayulu@nju.edu.cn

中图分类号: P534.6;P56;Q913.84

收稿日期:2018-06-11
修回日期:2018-07-31
刊出日期:2018-09-30

Cenozoic palynological records and vegetation evolution in the Weihe Basin, Central China

Zhao Lin^1,,
Lu Huayu^1,,,
Tang Lingyu²
1. School of Geography and Ocean Science, Jiangsu Provincial Collaborative Innovation Center of Climate Change, Nanjing University, Nanjing 210023, Jiangsu
2. Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, Jiangsu


More Information

Corresponding author: Lu Huayu,E-mail:huayulu@nju.edu.cn

MSC: P534.6;P56;Q913.84

--> Received Date: 11 June 2018
Revised Date: 31 July 2018
Publish Date: 30 September 2018


摘要
摘要:在新生代全球变冷的背景下，亚洲环境变化的主要特征之一是季风气候的形成和演化。渭河盆地具有连续的新生代沉积序列，为研究新生代植被演化历史，探究季风的阶段性变化特征提供了良好材料。文章通过分析和综合集成渭河盆地新生代的孢粉记录，初步重建了新生代以来的古植被和古气候变化序列。始新世植被以含热带亚热带乔木成分的落叶阔叶林为主，气候暖湿；渐新世植被类型为含常绿树种的落叶阔叶林，气候相对暖热湿润；早中新世植被以落叶阔叶树为主，气候温暖湿润，晚中新世植被以森林草原为主，气温和降水比早中新世略有降低；上新世植被为落叶阔叶林和针叶林交替出现，后期变为森林草原，气候向干凉方向发展；第四纪以来，植被向森林草原—稀疏的森林草原—草原发展，气候变化趋于凉干。新生代以来降水阶段性减少，与全球变冷趋势基本一致，可能揭示了全球变冷对构造时间尺度亚洲季风降水和植被演替的影响。
关键词: 新生代/
孢粉/
渭河盆地/
气候变化/
植被演替

Abstract:Under the background of global cooling during Cenozoic, the main feature of Asian environmental change is the formation and evolution of Asian Monsoon. The Weihe Basin, known as the Weihe graben Basin or Guanzhong Plain, is located in the middle of Shaanxi Province and between Qinling Mountains and the Weibei Mountains. The Weihe Basin has a continuous Cenozoic sedimentary sequence, which provides an excellent archive for studying history of vegetation evolution and exploring the characteristics of the Asian monsoon variation in Cenozoic. Tertiary strata of the Weihe Basin are composed of Honghe, Bailuyuan, Lengshuigou, Koujiacun, Bahe, Lantian and Sanmen formations. We use the pollen data of Xiangcheng Formation in Lushi Basin as an equivalent of Honghe Formation to reconstruct vegatation of Middle to Late Eocene. The data of Xiangcheng Formation, Bailuyuan Formation, Lengshuigou Formation, Lantian Formation and Sanmen Formation are from previous studies and data of Bahe Formation is from our study. By analyzing and integrating the pollen data, this paper reconstructs the paleovegetation and paleoclimate change of the Weihe Basin in Cenozoic.
The vegetation was deciduous broad-leaved forest containing tropical and subtropical trees in Middle to Late Eocene, which indicate the climate was very warm and wet. During the Oligocene, vegetation was a deciduous broadleaf forest containing some evergreen tree species, the climate was warm and wet. The vegetation was mainly deciduous broad-leaved tree and the climate was warm and humid during the Early Miocene. In the Late Miocene, vegetation was mainly forest and grassland, and the temperature and precipitation were slightly lower than the Early Miocene. The vegetation was deciduous broad-leaved forest and coniferous mixed forest during the Pliocene. In the Late Pliocene, the climate shifted to dry and cool. Since the Early Pleistocene, the vegetation was replaced by the forest and grassland, the steppe and forest, and the grassland. During the Eocene, tropical plant species were grown in the Weihe Basin. The tropical and subtropical trees decreased slightly during the Oligocene, and the temperature and precipitation decrease compared with the Eocene. The vegetation in Miocene was non-tropical, containing a small number of subtropical trees, and the climate was warm and wet. The vegetation of the Pliocene contains a very small number of subtropical heat-loving trees, which indicate the climate was warm and humid, and the climate was dry at the end of the Pliocene. In the Quaternary, the climate was general dry, and accompanied by significant changes in temperature during glacial-interglacial alternations. In the Cenozoic era, the monsoon precipitation decreased gradually, which was consistent with the global cooling trend. All of these observation reveal the global cooling might be a major driver for the phase weakening of Asian monsoon at tectonic time scale.
Key words:Cenozoic era/
pollen/
Weihe Basin/
climate change/
vegetation succession



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