四川冕宁地区一万年来的植被与环境演变  

VEGETATION AND ENVIRONMENTAL VARIATIONS SINCE HOLOCENE IN MIANNING AREA, SICHUAN PROVINCE

作　　者：童国榜 吴瑞金[2] 吴艳宏[2] 石英 刘志明 李月丛[3] 

机构地区：[1]中国地质科学研究院水文地质环境地质研究所,石家庄050061 [2]中国科学院南京地理与湖泊研究所湖泊与环境开放实验室,南京210008 [3]河北省文物研究所,石家庄050031

出　　处：《微体古生物学报》2000年第4期470-477,共8页Acta Micropalaeontologica Sinica

基　　金：国家自然科学基金!(编号 :4 9672 1 32 )资助项目

摘　　要：依据彝海洼地钻孔高分辨率的孢粉时间序列 ,探讨了安宁河谷近 1 0 Ka来的古植被及古环境变迁。本区全新世大暖期以山毛榉科花粉连续的大量出现为标志 ,时间为 8.8- 2 .6Ka BP,前期温暖湿润 ,后期温热半湿 ,且冬季干旱化。气候波动明显存在 3.5Ka,1 Ka及 0 .2 5Ka的准周期。近 3Ka年来气候经历了两次大的干湿冷暖变化 ,可划分为四个气候期 ,基本为凉湿暖干的组合型式 ,降水量的变化与南极有可比性。Based on the pollen assemblage of the Yihai bog, Sichuan Province, Paleovegetation and paleoenvironmental variations in Anning River Valley since Holocene were discussed in this paper. In this area, Megathermal began at about 8.8KaBP indicated by continuously emerging pollen of Fagaceae, and ended around 2.6KaBP. In the early stage of Megathermal the paleoclimate was warm and humid, and hot and slightly humid in the later stage. There were obvious para cycles of 3.5Ka, 1Ka and 0.25Ka for paleoclimate variation. In recent 3Ka, paleoclimate has undergone two violent changes and can be divided into four climate stages basically of cool and humid or warm and arid. Precipitation can be compared with that of Antarctica.

关 键 词：孢粉序列 高分辨率 全新世 彝海 四川 

分 类 号：Q91[天文地球—古生物学与地层学]