Distributions of bacterial branched tetraether lipids associated with bacterial communities in hummock and hollow soils from Southern Tibetan peatland

Tang，Xiaotong1; Zhang，Wan2; Chen，Yufei2; Lu，Peiqi1; Fan，Tongyu1; Zheng，Fengfeng2; Wang，Junyu3; Xia，Yu4; Zheng，Yanhong1

2024-08-20

10.1016/j.chemgeo.2024.122170

Chemical Geology   影响因子和分区

0009-2541

Branched glycerol dialkyl glycerol tetraethers (brGDGTs), special membrane-spanning lipids derived from some bacteria, are widely used as molecular tools in paleoenvironmental studies to reconstruct terrestrial temperature and pH conditions. However, the impact of microtopography discrepancies on the accuracy and applicability of brGDGT-based proxies remains unclear. Here we investigated the distributional patterns of brGDGTs and bacterial communities within the hummock-hollow microtopography in the mid-southern Tibetan peatlands. Our results show that the methylation index of C5-methyl brGDGTs (MBT′) values are significantly correlated with the local mean annual air temperature (MAAT). However, the peat-specific temperature calibration exhibits an underestimation of MAAT compared to the present MAAT. We find the MBT′ values are significantly lower in the moist hollows than that in the drier hummocks. This discrepancy could be primarily attributed to the shifts in bacterial communities and the physiological adaptation of brGDGT-producing bacteria driven by the high soil water content. These findings highlight the remarkable variability of MBT′ values at small spatial scales, which holds profound implications for paleotemperature reconstruction in alpine peatlands.

Bacterial community BrGDGTs MBT′5ME Microtopography Soil water content Tibetan peatlands

SCI ; EI

英语

其他

20242116138304

Alkylation ; Bacteria ; Lipids ; Soil moisture ; Wetlands

Soils and Soil Mechanics:483.1 ; Chemical Reactions:802.2 ; Organic Compounds:804.1

GEOSCIENCES

2-s2.0-85193775120

Scopus

1.State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi'an,China
2.Shenzhen Key Laboratory of Marine Archaea Geo-Omics,Department of Ocean Science and Engineering,Southern University of Science and Technology,Shenzhen,China
3.Xi'an Gaoxin No.1 High School,Xi'an,China
4.Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Tang，Xiaotong,Zhang，Wan,Chen，Yufei,et al. Distributions of bacterial branched tetraether lipids associated with bacterial communities in hummock and hollow soils from Southern Tibetan peatland[J]. Chemical Geology,2024,660.

Tang，Xiaotong.,Zhang，Wan.,Chen，Yufei.,Lu，Peiqi.,Fan，Tongyu.,...&Zheng，Yanhong.(2024).Distributions of bacterial branched tetraether lipids associated with bacterial communities in hummock and hollow soils from Southern Tibetan peatland.Chemical Geology,660.

Tang，Xiaotong,et al."Distributions of bacterial branched tetraether lipids associated with bacterial communities in hummock and hollow soils from Southern Tibetan peatland".Chemical Geology 660(2024).