Arid
DOI10.2343/geochemj.2.0412
Contrasting distributions of bacterial branched tetraethers along a soil-river-lake transect in the arid region of Northwestern China
Lu, Jiayi1,2; Yang, Huan1,2; Zheng, Fengfeng3; Dang, Xinyue2; Li, Yang4; Xie, Shucheng1
通讯作者Yang, Huan
来源期刊GEOCHEMICAL JOURNAL
ISSN0016-7002
EISSN1880-5973
出版年2016
卷号50期号:3页码:249-265
英文摘要

Understanding the transport of branched glycerol dialkyl glycerol tetraethers (brGDGTs) along the soil-river-lake transect is of vital importance, which helps discriminate the autochthonous from allochthonous contribution of brGDGTs in lake and river environment and favors the application of brGDGT-based proxies in paleo-reconstruction. We collected the sediment samples from the Qinghai Lake, the largest saline lake in China, as well as the river sediments and catchment soils, to examine the difference in the distribution of 5- vs. 6-methyl brGDGTs along the soil-river-lake transect. The brGDGT distributions were found to show a large variation along the transect, which can be reflected by the MBT’-derived indices and IR indices. There is a considerable difference in brGDGT distributions between soil and the river sediment. The inflowing rivers likely receive terrestrial brGDGT input to a variable degree. BrGDGTs in the Buha river are primarily of autochthonous origin whereas other ephemeral streams, like the Heima river, exhibit a similar brGDGT distribution to the surrounding soils, reflecting that these compounds are likely derived from soils. A higher quantity of 6-methyl brGDGTs and brGDGT-Ia was observed in the lake than in the river sediments, pointing to a preferential degradation of 5-methyl brGDGTs and/or an increase of in situ production of 6-methyl brGDGTs in the lake. In addition, in arid and alkaline soils, both CBT’ and IR indices have strong correlations with soil pH even within the narrow pH range. Furthermore, we find a clear relationship of CBT with water salinity in Buha river. The difference in soil and river leads to a complicated interpretation for the CBT (CBT’) index. In the lake, the MBT’ (specially represented by MBT’(5ME) and MBT’(6ME)), defined mainly by the fractional abundance of GDGT-Ia, increases with lake water depth, suggesting the maximum water depth is likely to impact the use of MBT’/CBT proxy in the Qinghai Lake.


英文关键词brGDGTs 6-methyl isomers saline and alkaline lake semi-arid region
类型Article
语种英语
国家Peoples R China
收录类别SCI-E
WOS记录号WOS:000383257800004
WOS关键词DIALKYL GLYCEROL TETRAETHERS ; SUSPENDED PARTICULATE MATTER ; MEMBRANE-LIPIDS ; QINGHAI LAKE ; ENVIRONMENTAL CONTROLS ; SURFACE SEDIMENTS ; YENISEI RIVER ; GDGTS ; CALIBRATION ; ABUNDANCE
WOS类目Geochemistry & Geophysics
WOS研究方向Geochemistry & Geophysics
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/193159
作者单位1.China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China;
2.China Univ Geosci, Sch Earth Sci, Wuhan 430074, Peoples R China;
3.Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China;
4.China Natl Petr Corp, Lanzhou Petrochem Co, Lanzhou 730000, Peoples R China
推荐引用方式
GB/T 7714
Lu, Jiayi,Yang, Huan,Zheng, Fengfeng,et al. Contrasting distributions of bacterial branched tetraethers along a soil-river-lake transect in the arid region of Northwestern China[J],2016,50(3):249-265.
APA Lu, Jiayi,Yang, Huan,Zheng, Fengfeng,Dang, Xinyue,Li, Yang,&Xie, Shucheng.(2016).Contrasting distributions of bacterial branched tetraethers along a soil-river-lake transect in the arid region of Northwestern China.GEOCHEMICAL JOURNAL,50(3),249-265.
MLA Lu, Jiayi,et al."Contrasting distributions of bacterial branched tetraethers along a soil-river-lake transect in the arid region of Northwestern China".GEOCHEMICAL JOURNAL 50.3(2016):249-265.
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