【摘要】 根据腾格里沙漠断头梁人工开挖剖面距今约４２０００～２３０００ａＢＰ（晚更新世）的孢粉分析结果，可将该期植被和气候演化划分为５个阶段（组合带）：阶段Ⅰ，约４２０００～３８０００ａＢＰ，此段孢粉组合特征显示出，在现今为戈壁荒漠的山地丘陵上，当时发育着针阔混交林，在古湖边缘上发育着杨柳林和草原，气候较温暖湿润；阶段Ⅱ，约３８０００～３１０００ａＢＰ，气候温暖湿润，地带性植被为以温带、暖温带阔叶林为主的针阔混交林，湖畔河边发育着草甸植被；阶段Ⅲ，约３１０００～３００００ａＢＰ，为针叶林和寒温性高山柳丛大发展时期，气候寒温，为一冷期；阶段Ⅳ，约３００００～２８０００ａＢＰ，为冷期过后的升温期，也是湖面扩大期，孢粉组合中藻类含量高，为草甸和沼泽植被；阶段Ⅴ，２８０００～２３０００ａＢＰ，孢粉组合显示出丘陵山地上发育温带柏和桦为主的针阔混交林，平原上生长着草原植被，湖畔、河边有柳林分布，气候较温暖湿润，但较阶段Ⅰ略干。此剖面孢粉组合所反映的气候变化特征与古里雅及格陵兰冰芯δ１８Ｏ所记录的同期气候变化特征具有良好的可比性。更多还原

【Abstract】 Palynoflora studies on the Duantouliang section, located at 39°40′N, 103°55′E in Northwestern Tengger Desert, China showed that, based on the spore pollen assemblages, the major vegetation and climatic environment between 42000 to 23000 a BP could be divided into the following different periods:Ⅰ. From 42000 to 38000 a BP, the spore pollen assemblages displayed that the mixed conifer/deciduous broad leaved forests developed on the mountain and its foothill regions where the bare Gobi desert are at present; At that time, Populus and Salix forests and grassland surrounded the Paleaolake, the climate condition was much warmer and humid than today;Ⅱ. From 38000 to 37000 a BP, the climate was warm and moist, it was the most suitable period for the plant growth, the studied area was dominated by the temperate and warm temperate mixed broad leaf deciduous and needleleaf forest, there was meadow spreaded on the river sides and lake beaches;Ⅲ. From 31000 to 30000 a BP, the needleleaf forests and cold temperate Salix oritrepha shrubs were flourishing, and the climate at that time was relatively cold;Ⅳ. From 30000 to 28000 a BP, the temperatures began increasing, the high lake levels was formed during this time, and the vegetations were meadows and swamps;Ⅴ. From 28000 to 23000 a BP, temperate Cupressaceae and Betula mixed conifer/deciduous forests grew on mountain and foothill region, grassland developed on plain areas, Salix was on lake and river sides. This indicates a warm and moist climate condition but it was drier than the earliest period.更多还原