巴汗淖孢粉记录的全新世环境变化  

Holocene palaeoenvironment changes recorded by pollen of Baahar Nuur Lake

作　　者：黄昌庆[1] 冯兆东[1,2] 马玉贞[3] 郭兰兰[3] 王维[1] 

机构地区：[1]兰州大学西部环境教育部重点实验室,兰州730000 [2]Department of Geology, Baylor University, Waco, TX 76798, USA [3]北京师范大学资源学院,北京100875

出　　处：《兰州大学学报（自然科学版）》2009年第4期7-12,共6页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金委重点项目(NSFC-40331012);美国自然科学基金委项目(NSF-ESH04-02509)

摘　　要：利用AMS^(14)C测年,分析了鄂尔多斯高原中部巴汗淖湖泊沉积物孢粉,揭示了鄂尔多斯高原全新世植被和气候演化历史:8.696～7.847 kaBP植被以荒漠草原主导,气候寒冷干旱;7.847～7.130 kaBP植被转变为禾草草原,温湿条件得到改善,但区域气候很不稳定;7.130～4.780 kaBP植被演化为疏林草原,气候温暖湿润且稳定;4.780～4.207 kaBP为松-栎混交林,为温暖湿润且稳定的气候最宜期; 4.207～3.622 kaBP植被退化为松属-禾草森林草原,气候向干旱化方向发展;3.622 kaBP以来,植被进一步退化为荒漠草原,气候进一步变干.A pollen chrono-sequences was obtained from Baahar Nuur Lake cores in the Ordos Plateau, China. Based on AMS constraints, a detailed holocene history of vegetation and climate changes was reconstructed. 8.696-7.847 kaBP, a desert steppe occupied the landscape, cold and dry conditions sustained. 7.847-7.130 kaBP, grass steppe dominated the study area. Climate became warmer with increasing humidity, but it was unstable. 7.130-4.780 kaBP, regional forest steppe expanded. It suggested a warm and humid climate. 4.780-4.207 kaBP, Pinus-Quercus forest dominated the study area. It suggested an optimal warm and humid climate. 4.207-3.622 kaBP, regional forest steppe expanded. Climate became drier and cooler. A persistent deterioration of vegetation indicated that climate continued to become drier and cooler from 3.622 kaBP.

关 键 词：全新世 孢粉 气候变化 巴汗淖 鄂尔多斯高原 

分 类 号：P532[天文地球—古生物学与地层学]