新疆塔克拉玛干沙漠中两个钻孔的孢粉分析及其意义

通过塔中1井和满西1井两个钻孔的孢粉特征.划分出7个组合带.上新世晚期.塔克拉玛干大部为草原和荒漠平原,河流沿岸生长着以榆为主的落叶阔叶林.第四纪以来气候干旱.北部以荒漠为主;南部以荒漠草原为主,平原河谷广泛分布着以扬、柳、榆为主的落叶阔叶林.根据古植被可以看出,上新古世有面积不大的沙漠出现,到第四纪北部沙漠发育,南部具阶段性发育.

ANALYSIS OF POLLEN FROM TWO DRILL HOLES IN TAKLIMAKAN DESERT OF XINJIANG AND ITS SIGNIFICANCE

Based on the characteristics of pollen from Tazhong No.1 drill hole and Manxi No.1 dill hole, seven assemblage zones are divided. In the later stage of Pliocene, most part of Taklimakan region was grassland or desert plain, with broadleaf forest, mainly elm, growing along river banks. Since Quarternary, the climate has been dry, and the northern part of the region is mainly desert and the southern part is desert and grassland, with broadleaf forest, dominated by poplar, willow and elm, being widespread in plain and river valley. Based on the ancient vegetation, it can be seen that smaller area of desert appearred in Pliocene, and in Quarternary desert was developed in the north part and also developed in stages in the southern part.