Vegetation and climate change during Marine Isotope Stage 3 in China  

作　　者：Yan Zhao Zicheng Yu Ulrike Herzschuh Bao Yang Hui Zhao Keyan Fang Huan Li Quan Li 

机构地区：[1]Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences [2]Department of Earth and Environmental Sciences, Lehigh University [3]Alfred Wegner Institute for Polar and Marine Research [4]Cold and Arid Regions Environment and Engineering Research Institute, Chinese Academy of Sciences [5]Fujian Normal University [6]Research School of Arid Environment and Climate Change,Lanzhou University

出　　处：《Chinese Science Bulletin》2014年第33期4444-4455,共12页

基　　金：supported by the Hundred Talents Programme of the Chinese Academy of Sciences;the National Natural Science Foundation of China(41125006,41330105);Humboldt Research Fellowship for Experienced Researchers

摘　　要：Fossil pollen records from 45 sites across China were evaluated and synthesized to document vegetation and climate change during Marine Isotope Stage 3(MIS 3)at 60–27 ka and to understand the large-scale controls.During MIS3, vegetation type was dominantly forest in eastern China, forest steppe/meadow in the north and Tibetan Plateau, and steppe desert in northwestern arid China. We developed a semi-quantitative vegetation index to reflect change in plant abundance(by inferring the general climate conditions), with a vegetation score from 1to 3 based on the different vegetation types inferred from pollen data at individual sites at intervals of 2,000 years.The reconstructed vegetation index shows higher values during MIS 3, especially during the period 53–40 ka, than at the Last Glacial Maximum. Our results also suggest that climate on the basis of vegetation change was cooler and drier during MIS 3 than during the Holocene optimum;however, MIS 3 vegetation was probably similar to modern vegetation. The close relationship between vegetation change, insolation and Asian summer monsoon strength suggests that climate variations, probably in both temperature and precipitation, are the primary drivers of regional vegetation change. Additional well-dated, high-resolution palaeoclimate records from many locations across China will be needed to understand the vegetation change and climate forcings on millennial and centennial scales within MIS 3.Fossil pollen records from 45 sites across China were evaluated and synthesized to document Vegetation and climate change during Marine Isotope Stage 3 （MIS 3） at 60-27 ka and to understand the large-scale controls. During MIS3, vegetation type was dominantly forest in eastern China, forest steppe/meadow in the north and Tibetan Plateau, and steppe desert in northwestern arid China. We developed a semi-quantitative vegetation index to reflect change in plant abundance （by inferring the general climate conditions）, with a vegetation score from 1 to 3 based on the different vegetation types inferred from pollen data at individual sites at intervals of 2,000 years.The reconstructed vegetation index shows higher values during MIS 3, especially during the period 53-40 ka, than at the Last Glacial Maximum. Our results also suggest that climate on the basis of vegetation change was cooler and drier during MIS 3 than during the Holocene optimum; however, MIS 3 vegetation was probably similar to modern vegetation. The close relationship between vegetation change, insolation and Asian summer monsoon strength suggests that climate variations, probably in both temper- ature and precipitation, are the primary drivers of regional vegetation change. Additional well-dated, high-resolution palaeoclimate records from many locations across China will be needed to understand the vegetation change and climate forcings on millennial and centennial scales within MIS 3.

关 键 词：深海氧同位素 植被类型 气候变化 中国海洋 草原化荒漠 植被变化 中国东部地区 森林草原 

分 类 号：P532[天文地球—古生物学与地层学] Q914[天文地球—地质学]