[关键词]
[摘要]
本文在鹤庆深钻孢粉分析的基础上,把各孢粉类型划分成不同的孢粉生态组,结合孢粉多样性指数,系统重建云南鹤庆地区2.78 Ma以来的占气候演化所经历的8个大的阶段,与西南季风在滇西北地区8次大的变化相对应:即在2.729-2.608Ma和0.118Ma-11.83ka BP期间,气候整体湿润,冬、夏季降水的季节性较强,反映西南季风相对较强盛;1.447-0.342Ma期间,气候整体逐渐变湿,冷暖、干湿变化幅度逐渐变大,气候组合特征逐渐变复杂,反映西南季风逐渐增强,其波动幅度也逐渐变大,并于0.991-0.342Ma期间达到最强盛,其波动幅度也最大;而在2.780-2.729Ma、2.608-1.447Ma和0.342-0.118Ma期间,气候普遍相对温暖干旱,西南季风相对较弱.
[Key word]
[Abstract]
Pollen types identified from the Heqing deep drilling core were divided into different pollen ecological groups in this paper. The changes of seven pollen ecological groups,two palynological diversity indices (D-total and H'-total) and several high percentage pollen taxa are used to reconstruct the palaeoclimatic evolution of the Heqing Basin of Yunnan Province. The palaeolcimate went through eight major stages since 2.780 Ma (late Pliocene to Holocene). Corresponding with the palaeoclimate,the southwest mo...
[中图分类号]
Q913
[基金项目]
国家自然科学基金，国家杰出青年科学基金，湖泊与环境国家重点实验室开放基金联合资助?
