黄土高原晚更新世的植被与气候环境
收稿日期: 2003-12-25
修回日期: 2004-05-29
网络出版日期: 2004-10-15
基金资助
中科院西安黄土与第四纪地质开放研究实验室基金资助项目(9901611)
Vegetation and climate environment during the late Pleistocene in Loess Plateau, China
Received date: 2003-12-25
Revised date: 2004-05-29
Online published: 2004-10-15
李秉成, 孙建中 . 黄土高原晚更新世的植被与气候环境[J]. 地理研究, 2004 , 23(5) : 641 -648 . DOI: 10.11821/yj2004050008
We have worked out quite a few pollens and spores from the commonly sporopollen poor loess, and plotted some concentration sporopollen diagrams of the loess strata for the first time. The evolution of vegetation and corresponding climate in time and space in the region has been brought to light by an analysis of the variation of sporopollen assemblages in many sections. There are three interstadials, warmer than present and two cooler stadials in the last interglaciation. They are correlated with the substages 5a, 5b, 5c, 5d and 5e of the deep sea oxygen isotopic curves. The climate in the stadials was severely cold, with a mean annual temperature 14℃ lower than the present. The climate in the interstadials was relatively warmer, with a mean annual temperature 3-9℃ lower than the present. The temperature in the stadials of the last interglaciation was the same as that in the interstadials of the last glaciation. The temperature in the interstadials was 1-3℃ higher than the present. It is known by comparing the sporopollen dliagrams from ten sections in the Loess Plateau that the changes of vegetation in time are very similar, implying that they were controlled by the same global climatic change. But the vegetation may vary from place to place due to changes of local natural environment. Vegetation during the late Pleistocene in the Loess Plateau is familiar with vegetation types of the warm-belt generally. When in the case of stadials of the interglaciation and interstadials of the glaciation, the alpine vegetation was descended to the land level, and in the stadials of the last glaciation, steppe or desert steppe landscapes were commonly seen.
Key words： loess; late Pleistocene; sporopollen; paleoclimate; paleoenvironment
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