A biomass burning record from the Lingtai Loess Section during the last 370 ka and implication for climate and environment

查看全文 作　　者：ZHOU [1,2]Bin;SHEN [1,3]Chengde;SUN [1]Yanmin;YANG [1]Ying;YI [1]Weixi 机构地区：[1]Guangzhou Institute of Geochemistry, Chinese Academy of Sciences,Guangzhou 510640, China;[2]Graduate School of the Chinese Academy of Sciences, Beijing 100039, China;[3]Institute of Earth Environment, Chinese Academy of Sciences, Xi'an710054, China 出　　处：《Chinese Science Bulletin》索引2006年第51卷第17期,共9页 基　　金：This work was supported by the National Natural Science Foundation of China (Grant Nos. 40231015, 40473002);Knowledge Innovation Project of the Chinese Academy of Sciences (Grant Nos. KZCX2-SW-118, GIGCX-03-06, GIGCX-04-05). 摘　　要：The history of natural fire and its rela- tionship with climate and vegetation are revealed from the content of elemental carbon and associated pollen data and paleoclimatic substitutive indicators for the loess of Lingtai Section in the last 370 ka BP. The study indicates that intense episodes of vegeta- tion fires occurred during the interim especially when the climate was changing from wet to drought. The average content of elemental carbon in the intergla- ciers is higher than that in the glaciers, which coin- cides with the biomass change locally (or globally). The content of elemental carbon increases in the stage around 130 ka BP, indicating that the vegeta- tion and climate pattern have changed, which may contribute to the variation of CO2. As a whole, the content of elemental carbon increasing with the time reflects the increasing aridity trend to some degree. In addition, the occurrence of the maximum peak and the highest average content of elemental carbon in the Holocene reflects the occurrence of a rapid cli- mate event in 5900 a BP and more frequent fires caused by anthropic activities. 关 键 词：碳元素 生物量 环境 气候