云南鹤庆盆地末次盛冰期的孢粉记录与古季风  

THE LAST GLACIER MAXIMAL POLLEN RECORD IN THE LAKE SEDIMENTS FROM ANCIENT HEQING LAKE AND ITS SIGNIFICANCE FOR PALAEOMONSOON

作　　者：蒋雪中[1] 羊向东[2] 王苏民[2] 童国榜[3] 

机构地区：[1]南京大学城市与资源学系,南京210093 [2]中国科学院南京地理与湖泊研究所,南京210008 [3]国土资源部水文地质工程地质研究所,河北正定050803

出　　处：《微体古生物学报》2001年第3期263-267,共5页Acta Micropalaeontologica Sinica

基　　金：中国科学院创新项目 ( KZCX1-10 -0 1) ;自然科学基金 ( 95 72 131)

摘　　要：通过研究相当于末次盛冰期鹤庆古湖泊沉积物 4 .6- 9.0 m段的孢粉记录 ,对该区末次盛冰期阶段的植被与古季风变迁模式进行了恢复。该区末次盛冰期冷湿的气候特点与同时期东部干旱的草原植被、青藏高原的荒漠植被和黄土高原区风尘堆积存在明显差异 ,而与滇池的气候记录有较好的一致性。冰期内部的气候波动与深海氧同位素记录也有较好的可比性。冰期冷锋强度的增加 。The palaeovegetation succession and palaeomonsoon of the last glacier maximal(LGM) have been reconstructed from the pollen record of the lake sediments from ancient Heqing Lake. In LGM, the winter hardiness and hydrophilous coniferous species and deciduous broadleaved species increased, suggesting the distinct descent of temperature in winter or increase of front precipitation in summer. It may suggest that the weakening or regression of the south branch of westlie and the enhancement of the albedo of Tibet Plateau and a stable cold high pressure can give rise to the intrusion of the cold airmass matched with the precipitation. The comparative study of the climate data from different monsoon regions show that the increased humidity is associated well with decreased temperature. This kind of regional climate features could have resulted from the complexity of atmospheric circulation in the southwest monsoon area, the plateau geomorphology and the change in the albedo of Qinghai Xizang Plateau.

关 键 词：末次盛冰期 孢粉记录 古季风气候 云南鹤庆盆地 

分 类 号：Q913.84[天文地球—古生物学与地层学]