华北上新世−更新世过渡期植被、气候与大气CO2研究进展
收稿日期: 2015-05-18
录用日期: 2015-08-04
网络出版日期: 2016-03-31
基金资助
国家重大科学研究计划(2014CB954201);国家自然科学基金(41271222);国家自然科学基金(30770148);国家自然科学基金(30990241);国家自然科学基金(41102017);中国博士后科学基金(2014M550822);中国科学院植物研究所系统与进化植物学国家重点实验室项目(LSEB2012-09)
Research Highlights of the Vegetation, Climate and Atmospheric CO2 in Yushe Basin, Shanxi, North China During the Plio-Pleistocene Transition
Received date: 2015-05-18
Accepted date: 2015-08-04
Online published: 2016-03-31
上新世−更新世过渡期是新生代全球气候变化的重要拐点之一, 此期气候经历了由“暖室”向“冰室”的转变。研究该气候转型期的特征可为科学界和国家层面应对现在和未来的全球气候变暖提供理论基础和实践指导。通过深入研究中国华北山西榆社盆地张村组上新世−更新世过渡期地层中保存的植物大化石、孢粉以及硅藻组合, 为重建该时段陆地生态系统中植被演替和气候变化提供坚实的生物学证据。在综合回顾张村组化石植物研究历史的基础上, 侧重介绍最近5年在古植被、古气候、古环境以及古大气CO2浓度重建等方面的最新进展。这些新成果定性及定量地刻画了第三纪−第四纪之交中国北方黄土高原东南缘气候变干、变凉的转型过程及其陆地生态系统中大气CO2浓度先升后降的变化趋势。
白云俊 , 魏雪苹 , 秦锋 , 李亚蒙 , 李金锋 , Parminder S. Ranhotra , 王宇飞 . 华北上新世−更新世过渡期植被、气候与大气CO2研究进展[J]. 植物学报, 2016 , 51(2) : 257 -264 . DOI: 10.11983/CBB15086
The Plio-Pleistocene transition is a key time interval with a remarkable climate switch from “greenhouse” to “icehouse” conditions across the Tertiary-Quaternary boundary. The plant megafossils, pollen-spores and diatom assemblages found in Plio-Pleistocene deposits of Zhangcun Lake, Yushe Basin, on the eastern edge of the Chinese Loess Plateau, provide a chance to reconstruct and interpret the vegetation, climate and environmental changes in North China. Here we briefly review the discoveries and research history of fossil plants and introduce the recent 5 years’ research highlights of the reconstruction of paleovegetation, paleoclimate, paleoatmospheric CO2 level and paleolake evolution. Those findings during the transition qualitatively and quantitatively (1) reflect a turning point towards cool and dry climate; (2) reveal a high peak of [CO2]atm with a new terrestrial-based proxy of stomatal index on leaves of Typha orientalis, thereby indicating transient interstadial phase; and (3) show a remarkable salinity shift from carbonate to sulfate in Yushe Basin based on the change in diatom assemblages, which indicates a significant aridification about 2.6 Ma on the east Loess Plateau of China.
Key words： climate changes; North China; paleo-CO2; Plio-Pleistocene transition; vegetation; Yushe basin
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