干旱区生态环境知识资源中心(Arid): 中亚阿尔泰山南坡表土和泥炭沉积物GDGTs综合研究

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	中亚阿尔泰山南坡表土和泥炭沉积物GDGTs综合研究
其他题名	INTEGRATED INVESTIGATION OF GDGTs IN SURFACE SOILS AND PEAT SEDIMENTS IN THE SOUTHERN ALTAI MOUNTAINS IN ARID CENTRAL ASIA
	郭海春; 曹建涛; 魏士凯; 石福习; 贾国东; 卞昊昆; 顾兆炎; 饶志国
来源期刊	第四纪研究
ISSN	1001-7410
出版年	2021
卷号	41 期号:4 页码:1001-7410
中文摘要	相对于我国季风区,西北内陆地区表土和泥炭沉积物的甘油二烷基甘油四醚化合物(GDGTs)现代过程研究结果报道较少。对中亚干旱区阿尔泰山南坡海拔梯度表土、高山泥炭地哈拉沙子和那仁夏周边坡地表土以及哈拉沙子表层泥炭沉积物进行了GDGTs分析,结果表明:1)其海拔梯度表土当中细菌来源支链结构GDGTs(brGDGTs)的分子分布特征主要响应于湿度的变化;2)同样主要由于湿度变化的影响,奇古菌的影响和贡献在相对低海拔地区更为明显,产甲烷古菌的影响和贡献在相对高海拔地区上升,导致古菌来源的类异戊二烯结构GDGTs(isoGDGTs)的TEX_(86)参数随海拔上升具有显著的降低趋势;3)哈拉沙子和那仁夏泥炭地泥炭沉积物当中的brGDGTs和isoGDGTs都并非主要来自周边坡地土壤的异源输入,而主要都是泥炭地原地自生来源。这些研究结果,一方面为在该区域利用GDGTs开展古环境、古气候重建提供基础性参考;另一方面,也对其他区域相应研究结果形成有益补充。
英文摘要	Glycerol Dialkyl Glycerol Tetraethers(GDGTs)are considered to paly an important role in reconstructing paleoclimate in both continental and marine environments.Previous studies of GDGTs in the terrestrial environments focus primarily on the surface soil from the monsoonal humid China.However,the equivalent studies in arid inland China are rarely reported,especially on the sources of GDGTs in peat sediments.In order to further understand the main climate control factors of the molecular distribution characteristics of GDGTs in surface soils,as well as the major source(s)of GDGTs in peat sediments,we investigated the distribution of GDGTs of surface soils and surface peat sediments in the southern Altai Mountains in arid Central China(47°56' ~ 48°48'N,86°55' ~ 88°23'E).This region belongs to the typical temperate continental climate,with long cold winters and short summers.We collected 42 samples,including 13 surface soils along an altitudinal transect(ca.1100 ~ 2500 m a.s.l.),11 surface soils from surrounding slopes of the alpine Sahara sand peatland(SSP;48°06'N,88°21'E;2446 m a.s.l.),4 surface soils from surrounding slopes of the Narenxia peatland(NRX;48°48'N,86°55'E;1763 m a.s.l.)and 14 surface peat sediments in the SSP.GDGTs in above samples were analyed by using the high performance liquid chromatography-atmospheric pressure chemical ionization-mass spectrometry(HPLC-APCI-MS).The results show that:(1)The molecular distributions of the branched GDGTs(brGDGTs)in altitudinal surface soils in southern Altai Mountains are primarily responded to the changes of humidity,resulting in no significant correlation between MBT'_(5ME) and altitude.This implies it should be cautious to use the soil brGDGTs for paleotemperature reconstructions in cold regions.(2)TEX_(86) of the isoprenoid GDGTs(isoGDGTs)in altitudinal surface soils have a significant decreasing trend with the increasing altitudes.It is also mainly in response to changes in humidity,demonstrating that the influence and contribution of Thaumarchaeota and Methanogens to isoGDGTs are relatively more obvious in relatively lower and higher altitudes,respectively.(3)Both the brGDGTs and isoGDGTs in the peat sediments of SSP and NRX are not mainly sourced from the surface soils in the uplands,but are mainly sourced from in situ origins.This means that the GDGTs results from regional surface soils are not suitable modern references for the paleoclimatic interpretations of the peat GDGTsrelated records from the Altai Mountains.That is,the regional peat-specific modern GDGTs investigations are needed for the reliable paleoclimatic interpretations of the peat GDGTs-related records from the Altai Mountains.In general,all the results provide fundamental references for the applications of GDGTs in paleoclimatic studies in arid Central Asia.From another aspect,all the results are beneficial complements to the study results of GDGTs from other regions.
中文关键词	表土 ; 泥炭沉积物 ; 现代过程研究 ; 阿尔泰山地
英文关键词	GDGTs GDGTs surface soils surface peat sediments modern-process studies Altai Mountains
类型	Article
语种	中文
国家	中国
收录类别	CSCD
WOS类目	Geology
CSCD记录号	CSCD:7011085
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/364998
作者单位	郭海春, 湖南师范大学地理科学学院, 长沙, 湖南 410081, 中国.; 魏士凯, 湖南师范大学地理科学学院, 长沙, 湖南 410081, 中国.; 饶志国, 湖南师范大学地理科学学院, 长沙, 湖南 410081, 中国.; 曹建涛, 同济大学, 海洋地质国家重点实验室, 上海 200092, 中国.; 贾国东, 同济大学, 海洋地质国家重点实验室, 上海 200092, 中国.; 石福习, 江西农业大学林学院, 鄱阳湖流域森林生态系统保护与修复国家林业和草原局重点实验室, 南昌, 江西 330045, 中国.; 卞昊昆, 中国科学院大学生命科学学院, 北京 100049, 中国.; 顾兆炎, 中国科学院地质与地球物理研究所, 中国科学院新生代地质与环境重点实验室, 北京 100029, 中国.
推荐引用方式 GB/T 7714	郭海春,曹建涛,魏士凯,等. 中亚阿尔泰山南坡表土和泥炭沉积物GDGTs综合研究[J],2021,41(4):1001-7410.
APA	郭海春.,曹建涛.,魏士凯.,石福习.,贾国东.,...&饶志国.(2021).中亚阿尔泰山南坡表土和泥炭沉积物GDGTs综合研究.第四纪研究,41(4),1001-7410.
MLA	郭海春,et al."中亚阿尔泰山南坡表土和泥炭沉积物GDGTs综合研究".第四纪研究 41.4(2021):1001-7410.