摘要
通过江汉平原钻孔的孢粉分析,并结合^(14)C测年,推测该区晚冰期以来植被发展经历了寒温性常绿针叶林→针叶落叶阔叶林→常绿阔叶落叶阔叶林→落叶阔叶林→常绿阔叶落叶阔叶林五个阶段。与其相应的气候变化过程是:冷湿→干凉→暖湿→凉湿→温湿。文中对晚冰期的植被与气候以及冰期后温暖期的起始年代、植被和气候进行了详细的讨论。
Pollen percentage and influx diagrams were prepared from two cores in Jianghan Plain,and studied by means of Fuzzy cluster and radiocarbon dating. This paper reports that there was a cool-temperate evergreen coniferous forest in late-glacial epoch, representing that the climate was cold and wet. In Holocene, the hypsithermal interval took place about 9100—3500 year B. P. and the maximum was about 8000 year ago. At that time, the vegetation was that of an evergreen and deciduous broad-leaf mixed forest, and the climate was warmer and damper than that of present. It also shows that the history of vagetational development and climate chenges in this area in the past 21900 years can be divided into five stages: (1) During 21000—10000 year B. P., the vegetation was one of the cool-temperate evergreen coniferous forest, dominated by Abies. The climate was cold and wet. (2) During 10000—9100 year B. P., the vegetation was that of the coniferous and deciduous broad-leaf mixed forest, consisting of Pinus. Quercus, Ulmus and Liquidambar, with a mild and cool climate. (3) During 9100—3500 year B. P., the mixed forest of evergreen and deciduous broad-leaf was predominant, consisting of Cyclobalanopsis, Fagus, Castanopsis, Castanea, Pterocarya, Quercus and Ulmus. The palaeoecological environment was warm and damp. (4) During 3500—2400 year B. P., there was deciduous broad-leaf, consisting of Quercus. Pterocarya,Liquidambar. and Pinus. The climate was droughter and cooler than that of stage(3). (5)During 2400 year B. P. to present, the broad-leaf forest, consisting of Quercus, Fagus, Liquidambar and Castanea, was dominant. The climate was warm and damp.
基金
中国科学院科学基金资助课题
关键词
植被
环境
冰期
江汉平原
Jianghan Plain
Late glacial
Postglacial
Vegetation and environment
