塔克拉玛干沙漠腹地晚冰期以来的环境与气候变化

通过对塔克拉玛干沙漠腹地地层剖面的沉积类型、孢粉、ｐＨ值、有机质、ＣａＣＯ＿３和地球化学气候指标Ｃ等分析，认为本区晚冰期以来一直处于荒漠环境，气候变化可划出四个阶段：１３－１０ｋａＢ．Ｐ．气候寒冷。温凉，干旱，湿度相对后期较大；１０－８ｋａＢ．Ｐ．气候温暖干旱，湿度相对减小；８－３ｋａＢ．Ｐ．气候炎热干旱，湿度最小；３ｋａＢ．Ｐ．至今气候温暖干旱，湿度较前增大，气候及环境与今相似。

ENVIRONMENTAL AND CLIMATIC CHANGES IN THE INTERIOR OF TAKLIMAKAN DESERT SINCE LATE GLACIAL AGE

The enviromental and climatic changes have been discussed based on the studied resultsof strata, pollen analysis,pH,organic matters, CaCO3 and climatic index of geochemistry in thestratum section in the hinterland of Taklimakan Desert.It show clearly that plants such as Ephedra,Chen owtiaccae and Artemiseaetc,are dominant and pH is more than 8. The content of organ icmatters is low but that of CaCO_3 is high.The information indicate that there are four phrases ofclimatic change since late glacial age:cold to cool arid,warm arid,hot arid and warm arid phasesbeing similar to today's conditions in late glacial age and early,middle and late Holocenerespectively,Mean-while,the humidity reduced slowly from late glacial age to middle Holocene andreached the lowest piont in middle Holocene,then returned to the today's conditions.