乌兰布和沙漠钻孔WL10ZK-1孢粉记录的末次冰期以来的植被变化  

THE VEGETATION CHENGES IN ULAN BUH DESERT SINCE THE LAST GLACIAL:POLLEN EVIDENCE FROM CORE WL10ZK-1

作　　者：陈雪梅[1,2] 李国强[1,2] 黄小忠[1,2] 赵晖[1,2] 

机构地区：[1]兰州大学西部环境教育部重点实验室,西部环境与气候变化研究院,兰州730000 [2]中国科学院寒区旱区工程研究所沙漠与沙漠化重点实验室,兰州730000

出　　处：《海洋地质与第四纪地质》2013年第4期169-174,共6页Marine Geology & Quaternary Geology

基　　金：国家自然科学基金项目(41171168,40972116);国家自然科学基金重点项目(41130102);兰州大学中央高校基本科研业务费专项资金项目(lzujbky-2013-210);西部环境教育部重点实验室2012年度开放基金联合资助

摘　　要：根据乌兰布和沙漠北部25m钻孔(WL10ZK-1)岩心的孢粉记录,结合OSL测年结果,初步讨论了乌兰布和沙漠地区的植被变化。结果表明,90kaBP以前,钻孔岩心为粉砂质泥,孢粉中出现香蒲花粉(最高达12%),并有较高的云杉(最高为22.5%)、禾本科和莎草科花粉,说明当时属于湖泊状态,以草原植被为主;90kaBP以来,乌兰布和沙漠以藜科,蒿属及柽柳和蒺藜科等旱生/盐生灌木为主,属于典型荒漠植被;8kaBP前后,孢粉谱中出现较高松属花粉,形成以蒿属花粉为主的草原植被。结合岩心信息,孢粉记录说明,90kaBP之前和8kaBP前后,乌兰布和沙漠主要为草原植被,周围山地生长有针叶树,末次冰期则主要为荒漠植被。The paleo-vegetation changes of the Ulan Buh Desert since last Glacial are discussed according to the lithology,chronology and pollen analyses of the drill core WL10ZK-1.The high content of Typha pollen（up to 12%）,and a quantity of Picea（up to 22.5%）,Poaceae and Cyperaceae pollen from the bottom of drill core indicate that there was a lacustrine environment with steppe vegetation in the Ulan Buh Desert before 90 ka.Since 90 ka,xerophytic/halophyte herbs or shrubs such as Chenopodiaceae,Artemisia coupled with Tamaricaceae and Zygophyllaceae dominated the pollen from the middle of the drill core which indicates a desert vegetation environment occurred during the last glacial.During the phase of 8~7 ka,the UBD is dune-pond environment with steppe vegetation characterized by high percentage of Pinus and Artemisia.

关 键 词：钻孔岩心 末次冰期 全新世 植被变化 乌兰布和沙漠 

分 类 号：P532[天文地球—古生物学与地层学]