中国第四纪孢粉植物群事件的记录

通过总结中国不同区域现有的孢粉资料，发现和民孢粉群的演化序列中明显地存在与演化趋势和周期不符的孢粉植物群事伯，归纳起来有三种类型，时间约万年的孢粉群突变事件，延续时间约千年的孢粉群贫乏事件和延时间几百年的孢粉群颤动，突变事件有４起，Ｂｅｔｕｌａ－Ａｅｍｉｓｉａ事件（２．５ＭａＢ．Ｐ）；Ａｒｔｅｍｉｓｉａ－Ｇｒａ，ｉｎｅａｅ事件（１．４Ｍａ．Ｂ．Ｐ．）；Ｅｐｈｅｄｒａ＝Ｃｈｅｎｏｐｏｄｉａｃｅａ事件

RECORDS OF QUATERNARY PALYNOFLORA EVENTS IN CHINA

Based on available sporopollen data from different regions in China, it has been concluded that there existed palynoflora events that were not consistent with the trend and cycles of Quaternary palynoflora evolution. To sum up, there are three types of the events: abrupt change events lasting about 10 000 years, palynoflora poor events lasting several thousand years and oscillation events lasting hundreds of years. There are four abrupt change events that constituted sequences for climatic cycles and can be used for stratigraphic division in Quaternary, namely the Butula Artemisia Event(2.5MaB.P.),the Artemisia Gramineae Event(1.2MaB.P. or 1.4MaB.P.), the Ephedra Chenopodiaceae Event (0.8MaB.P.) and Pinus Betula Event(0.2MaB.P.). There are eleven poor pollen events that were first found in the section of Huangling, Shanxi, and we thus call them HL 1-11 events respectively. All the events are found in Loess strata which were found near the boundary between loess and palaeosoil, and have recorded the alternation between winter and summer monsoon. Six oscillation events are recorded well in lacustrine and marine sediments. The Huanghai QC 2 core, typical of climate changes, are called HH 1-6 events respectively. The sporopollen assemblages in the core show great changes. All the pollen events occurred near the boundary between two environmental changes in Holocene.