策勒绿洲塔格勒剖面孢粉分析的初步结果

根据位于策勒绿洲与荒漠交错带的塔格勒剖面孢粉记录的初步研究表明,近７００ａＢ,Ｐ,来此地区气候的干旱状况持续未变,但期间仍有几次相对湿润期,即在剖面距顶２．７－２．０ｍ段,１．８－１．９ｍ段和０．８－０．６ｍ段孢粉组合特征显示出当时植被生长条件较好,生长环境相对湿润的特征,地层沉积物特征也有相应体现。

The Preliminary Study on the Spore-pollen Combination of the Tagele Section in Cele Oasis

?The spore - pollen study of the Tagle section, which locates in the inner Cele oasisshow that since about 700aBP, the dry regiem consectively existed, but three revealed relative wet periodspunctuated in the period, which appearred from about 630 to 3(X)aB - P., 200 to l70aB. P. and from 70- 30aB. P., imposed on the general desertification. Two important tindng boundaries of paleoclimaicevolution can be identified, i. e. at about 630aB. P., the wetting environmental transition was identicalwith the phase of "Abrupt climaic change"took place at about l230A. D., which was deduced from thehistoric references since 2000aB. P. obtained in eastem China; Another short climatic shift perhaps ap-Pearred at about 200aB. P., aller which desertification agglavated intensively.