Abstract
Microbial glycerol dialkyl glycerol tetraethers (GDGTs) in lacustrine sediments are widely used to reconstruct terrestrial paleoenvironments. However, lipids of diverse origin in lakes make it difficult to decipher environmental information, appealing for the necessity to evaluate the impact of terrigenous input on the distribution of GDGTs through long-term monitoring. In this study, we conducted two-year monitoring of GDGTs along the river, estuary, near shore, to the center of Lake Liangzi in central China. By comparing the spatiotemporal changes of GDGT distribution in suspended particulate matter (SPM) and surface sediments, we found that the archaeal isoprenoid GDGTs (isoGDGTs) were mainly produced in situ in the river-lake systems, and not affected by the soil input. In contrast, the bacterial branched GDGTs (brGDGTs) were affected, to some extent, by soil input, depending on the distance to the lakeshore. The soil input of brGDGTs was enhanced during an episode of abnormal rainfall (flood). Moreover, the large variation of isoGDGTs indicates the in situ production under the anoxic condition in lake water. The paired increase in the GDGT-0/Cren ratio and GDGT concentration might be diagnostic of flooding events in ancient times.
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Acknowledgments
We thank Shijin Zhao, Hongye Pei, Shi Qian, Miao Huang, and Zhenbo Yang for their aids during the fieldwork. We also have greatly benefited from the discussions with Dr. Yi Yang and Jie Wu from China University of Geosciences, Wuhan. This study was supported by the National Natural Science Foundation of China (Nos. 41830319, 42073072, 41821001, and 41807317), the State Key R&D Program of China (No. 2016YFA0601100), the Ministry of Education of China (No. 08030). The final publication is available at Springer via https://doi.org/10.1007/s12583-021-1552-6.
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Zhu, X., Wang, Y., Dang, X. et al. Spatiotemporal Distribution of Microbial Tetraether Lipids in a Lake and Its Inflowing River: Implications for the Identification of Flooding Events. J. Earth Sci. 33, 1601–1613 (2022). https://doi.org/10.1007/s12583-021-1552-6
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DOI: https://doi.org/10.1007/s12583-021-1552-6