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依据彝海洼地钻孔高分辨率的孢粉时间序列 ,探讨了安宁河谷近 1 0 Ka来的古植被及古环境变迁。本区全新世大暖期以山毛榉科花粉连续的大量出现为标志 ,时间为 8.8- 2 .6Ka BP,前期温暖湿润 ,后期温热半湿 ,且冬季干旱化。气候波动明显存在 3.5Ka,1 Ka及 0 .2 5Ka的准周期。近 3Ka年来气候经历了两次大的干湿冷暖变化 ,可划分为四个气候期 ,基本为凉湿暖干的组合型式 ,降水量的变化与南极有可比性。
Based on the high-resolution sporopollen time series of the borehole in the Yihai depression, the paleo-vegetation and paleoenvironmental changes in the Anning River valley near 10 ka were discussed. During the Holocene Holocene, the continuous emergence of large beech family pollen marked a period of 8.8-2.6 kPa BP, with warm and humid early stage and late-warm and semi-humid late winter with aridification. There is a clear quasi-periodic 3.5Ka, 1Ka and 0.52Ka climatic fluctuations. In the recent 3 years, the climate experienced two major changes in wet and dry climate, which can be divided into four climate phases, the basic combination of cold and warm and dry, the change of precipitation is comparable with the Antarctic.