摘要
根据昆仑山阿什库勒盆地几个露头湖相沉积剖面的孢粉分析结果和^(14)C年龄数据,揭示出15 000年以来的气候、植被、环境发展曾经历了5个阶段。较低温度出现在13 000aB.P.前后,当时湖面较低,盆地边缘冰水平原区出现地面切割。大约在11 000 aB.P.前后,气候转暖,冰川大量消融,湖面上升,沉积速度加快,进入全新世。8 000 aB.P.前后的中全新世,曾出现高潮面期,但高温期却出现在后,故盆地内高潮面期与高温期并不同步。全新世后期,气候进一步转向干暖,蒸发增加,湖面逐渐缩小,生态环境日趋向荒漠草原发展。
According to the results of sporo-pollen analysis and ^(14)C dating from 3 outcrops of lacustrine deposition in Ashikule Basin, Kunlun Mountains, the climate, vegetation and environment have undergone 5 periocls. A low temperature period appeared in about 13 kaB. P. The lake level was low, stream dissecting process occurred at the outwash plain of the basin at that time. The climate became warm in adout 11 kaB. P. Large amount of melting water made the lake level rise up, and de—positional rate sped up. In adout 8 kaB. P., there was another high water level period. But high temperature period appeared later. That means the high water level period did not coincide with the high temperature period in the basin. Climate became dryer and warner than that before since late Holocene. Evaporation got strongly, the lake area reduced gradually, and the ecological environment began to develop toward the desert steppe.
出处
《干旱区地理》
CSCD
北大核心
1993年第3期59-63,共5页
Arid Land Geography
基金
国家自然科学基金
