摘要
高原全新世大暖期发生于９０～３５ｋａＢＰ，早于我国大陆其它地区，并且在高原内部存在区域差异，东北部、西部及南部地区较早，其它地区稍晚。大暖期时，高原植被景观表现在分布高度的上移及森林的扩大。在大暖期鼎盛期，高原年均温度高于现代３～５℃左右，夏季风增强，年降水量增加１００～４００ｍｍ。湖泊水面扩张并升高，湖水变淡，高原泥炭发育，冰川退缩。
Basic features of Holocence Megathermal environment in the Tibetan Plateau are discussed by using pollen-spore, paleobiological, paleosole, lake fluctuation, peat deposit, ice core, periglacial landforms and loess recordes from the plateau. Holocence Megathermal event took place about 9.0～3.5 ka BP. in the plateau, earier than other places of China. Starting and ending times of the Megathermal had a regional difference in inland of the plateau, in general, early in the northeastern, western and southern parts and late in the other parts. During the Megathermal, vegetation on the plateau was very different to present time, and altitude zonation of vegetation moved upforeward and forest extended. In the maximum megathermal stage, mean annual air temperature was 3～5℃ higher than that of the present, annual precipitation increased by 100～400 mm with strengthened summer monsoon, lakes extended and their levels rose with freshened water in them. In addition, highland peat formed, glaciers retreated and permafrost degraded during the Holocene Megathermal in the plateau.
出处
《冰川冻土》
CSCD
北大核心
1997年第2期114-123,共10页
Journal of Glaciology and Geocryology
基金
国家攀登计划项目
国家自然科学基金
