柴达木盆地东缘晚更新世气候变化的(古)土壤发生记录  

THE CHARACTERISTICS OF CLIMATICFLUCTUATION RECORDED BY SOIL FORMATION SINCE LATE PLEISTOCENE IN EAST REGION OF QAIDAM BASIN

作　　者：郝永萍[1] 方小敏[2] 胡双熙[2] 管东红 奚晓霞[3] 

机构地区：[1]中国科学院地理研究所,北京100101 [2]兰州大学地理科学系,兰州730000 [3]兰州大学大气科学系,兰州730000

出　　处：《地理科学》1998年第3期249-254,共6页Scientia Geographica Sinica

基　　金：国家教委博士点基金;国家自然科学基金资助项目之一

摘　　要：柴达木盆地东缘典型剖面(古)土壤及其黄土母质的宏观特征和理化分析表明,本区晚更新世以来气候曾有几次较大的波动,反映了全球冰量影响的气候波动以及东亚季风气候的强弱变化特征.揭示出气候变化过程中温度和降水并不同步,温度主要受地球轨道变化引起的太阳辐射的影响;降水则主要取决于冬、夏季风的强弱对比关系.夏季风盛行时,降水丰沛.间冰段古土壤S_m的土壤发生特征和强度,揭示了除低温引起的蒸发减少外,降水丰沛也是导致5～3万a左右气候相当湿润的重要原因.Based on TL-dating, 14C-dating, soil macro-structure and physical-chemical analyses of samples from the Angutan section, the east region of Qaidam Basin, the following conclusions are proved. Since the Late Pleisto-cence, the climate has fluctuated several times, revealing the intensity of East Asia moonsoon system. Temperature and precipitation in the climate system didn't coincide with each other. When summer moonsoon was relatively strong, the precipitation increased; the pedogenic properties of Sm indicated that precipitation was also an important factor in the humid climate episode from 50 to 30 ka. B. P., except for the factor of low temperature.

关 键 词：柴达木盆地 晚更新世 气候变化 古气候 古土壤 

分 类 号：P532[天文地球—古生物学与地层学] P534.631[天文地球—地质学]