哈萨克斯坦Valikhanov剖面孢粉记录的28000年气候变化  

Palaeoclimate History Recorded by Pollen of Valikhanov Section During the Last 28000 Years in Kazakhstan

作　　者：黄昌庆 冉敏[3] 桑艳礼 Huang Changqing;Ran Min;Sang Yanli(Economy and Management department,Tongren University,Tongren Guizhou 554300,China;Department of Oceanography and Coastal Sciences,School of the Coast and Environment,Louisiana State University,1002Y Energy,Coast and Environment Building,Baton Rouge,LA 70803 USA;Geography School,Southwest University,Chongqing 400715,China;MOE Key Laboratory of Oasis Ecology,Central Asian Ecology-Environment-Evolution Research College of Xinjiang University,Urumqi Xinjiang 830046,China)

机构地区：[1]铜仁学院经济管理学院,贵州铜仁544300 [2]Department of Oceanography and Coastal Sciences,School of the Coast and Environment,Louisiana State University,1002Y Energy,Coast and Environment Building [3]西南大学地理科学学院,重庆400715 [4]新疆大学绿洲生态教育部重点实验室,乌鲁木齐830046

出　　处：《科技通报》2017年第9期54-58,167,共6页Bulletin of Science and Technology

基　　金：贵州省教育厅优秀科技创新人才项目:黔教合KY字2013-151号;美国国家自然科学基金项目(NSF-BCS-06-52304);贵州省科学技术基金项目(黔科合J字[2013]2273号);国家自然科学基金(40671190)

摘　　要：利用AMS14C测年,结合地层沉积物特点,对中亚哈萨克斯坦南部Valikhanov黄土-古土壤沉积剖面进行孢粉浓度分析。沉积地层自下而上分为4个孢粉带(V1~V4),V1带蒿属花粉浓度高于其它种属;V2带孢粉种类丰富多样而且稳定;V3带总孢粉浓度比前面带段增加,草原成分的草本植物花粉浓度变化剧烈;V4带总孢粉浓度尤其是藜科和麻黄花粉浓度迅速大幅增加。揭示了中亚干旱区28000年以来植被和气候演化历史:28~1814C ka B.P.,植被是以蒿为主的干草原,气候寒冷并且偏湿润;18~1014C ka B.P.,植被为蒿属植物占绝对优势的温带草原,气候偏湿润;10~514C ka B.P.,植被为蒿-藜沙漠草原,气候干旱;514C ka B.P.以后,植被为藜-蒿草原,气候湿润。Based on AMS14C age data,combined with Stratigraphy,we analyzed pollen record fromValikhanov section which is Loess-paleosol deposition in south Kazakhstan.Fossil pollen samples werecollected at intervals of^25cm and totally50samples were analyzed.The whole sediment is dividedinto4pollen zones(V1~V4)from bottom to top.Total pollen concentration is low with value20~30grains/g in zone V1and Atermisia pollen dominant this pollen assemblage.Pollen assemblage in zone V2is stable and diverse,total pollen concentration is low with average value^20grains/g.Total pollen concentration is25~1200grains/g in zone V3.Chenopodiaceae and Ephdra pollen increase withdramatically variety of Atermisia.Total pollen concentration is40~400grains/g in zone V4.Chenopodiaceae and Ephdra pollen increase sharply.This is high-resolution pollen data from Loesspaleosolsediment in Central Arid Asia.It is very helpful to comprehend the climate history in CentralArid Asia.It displays vegetation and climate history in central Asia during last2800014C ka B.P.asbelow:28~1814C ka B.P.,the vegetation probably was Artemisia arid steppe;Climate was cold andslightly wet.18~1014C ka B.P.,the vegetation was Artemisia steppe;Climate was slightly wet.10~514Cka B.P.,the vegetation was Atermisia-Chenopodiaceae desert steppe;Climate was dry and mild.After514C ka B.P.,the vegetation was Chenopodiaceae-Artemisia steppe;Climate was wet.During MIS2andHolocene,climate change in central arid Asia is mainly due to the northern hemisphere solar radiationand the corresponding changes in atmospheric circulation situation.

关 键 词：中亚干旱区 MIS2 全新世 孢粉 气候变化 

分 类 号：P532[天文地球—古生物学与地层学]