摘要
通过总结我国不同区域现有孢粉资料，发现第四纪孢粉植物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件。归纳起来有三种类型：延续时间约万年的孢粉植物群突变事件；延续时间数千年的孢粉植物群贫乏事件和延续时间几百年的孢粉植物群颤动事件。突变事件有４起：Ｂｅｔｕｌａ－Ａｒｔｅｍｉｓｉａ事件（２．５ＭａＢ．Ｐ．）；Ａｒｔｅｍｉｓｉａ－Ｇｒａｍｉｎｅａｅ事件（１．４ＭａＢ．Ｐ．）；Ｅｐｈｅｄｒａ－Ｃｈｅｎｏｐｏｄｉａｃｅａｅ事件（０．８ＭａＢ．Ｐ．）以及Ｐｉｎｕｓ－Ｂｅｔｕｌａ事件（０．２ＭａＢ．Ｐ．）。它们是第四纪气候旋回和地层划分的重要依据之一。贫乏事件有１１起，首次发现于陕西黄陵剖面，故称为ＨＬ１～１１事件。该事件位于黄土古土壤界面处的黄土中，记录了冬夏季风强烈交替的过程。颤动事件有６起，以湖泊和海洋沉积物中记录较完整，黄海ＱＣ２孔具代表性，故称为ＨＨ１～６事件。其孢粉序列表现为大幅度的摆动，处于全新世环境变化阶段的界面附近。
According to available sporopollen data from different regions in China,we conclude that there exist palynoflora events which don’t conform to the trend and cycles of Quaternary palynoflora evolution.To sum up,there are three types of the events:abrupt change events lasting about 10000 years,palynoflora poor events lasting several thousand years and oscillation events lasting hundreds of years.There are four abrupt change events which serve as a significant basis for climatic cycles and stratigraphic division in Quaternary,namely, Betula Artemisia event(2 5MaB.P.), Artemisia Gramineae event(1 4MaB.P.), Ephedra Chenopodiaceae event(0 8MaB.P.)and Pinus Betula event(0 2MaB.P.).There are eleven poor events which were first found in the section of Huanling,Shannxi,and we thus call them HL 1 11 events.All the events are located in loess strata and near the boundry between loess and palaeosol,and have recorded winter and summer monsoon exchanges.Six oscillation events are well recorded in lake and marine sediments.We call them HH 1 6 events because Huanghai QC2 core is the very typical one.The sporopollen assemblages have changed greatly,and all the events occur near the boundry between two environmental changes in Holocene.
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
1998年第3期13-22,共10页
Marine Geology & Quaternary Geology
