Distribution characteristic and its influencing factors of branched tetraether lipids in water columns of Lake Fuxian
TIAN Xiao-qing1, ZHANG Hu-cai2, SUN Hui-ling1
1. Yunnan Key Laboratory of Plateau Geographic Processes and Environment Change, Faculty of Geography, Yunnan Normal University, Kunming 650500, China; 2. Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Resources, Environment and Earth Sciences, Yunnan University, Kunming 650504, China
Abstract：Here we analyze an annual cycle of brGDGTs distribution and abundances in the water column (0~100m) of Lake Fuxian and its influencing factors, including water temperature (WT), dissolved oxygen (DO) and pH values, based on samples of soils, lacustrine surface sediments and suspended particulate matter (SPM) of water columns from an oligotrophic deep lake-Lake Fuxian in southwestern China. The aim of our research is to explore the response of brGDGTs distribution to the dynamic changes of environmental factors in Lake Fuxian from the perspective of real-time observation, to better discriminate the reliability of brGDGTs-based reconstructed palaeotemperatures. The results show that brGDGTs in water column are mainly in-situ production, while brGDGTs contributions from soil and river are quite weak. There is an obvious thermocline and oxycline at a water depth of 40m in Lake Fuxian.The total concentrations of brGDGTs covary with the phytoplankton biomass seasonally. The concentrations of brGDGTs compounds covary with vertical depth and time as well, especially 6-Methyl brGDGTs reaching its maximum in hypolimnion. There is a strong correlation between brⅢa’, MBT’, MBT’6ME and DO, indicating that DO influences the distribution of brGDGTs by influencing 6-methyl brGDGTs. The dynamic variations of DO in water column play an important role in the distribution of bacterial-derived brGDGTs in Lake Fuxian.
田小青, 张虎才, 孙惠玲. 抚仙湖水柱支链四醚膜脂化合物的分布特征及影响因素[J]. 中国环境科学, 2024, 44(10): 5766-5775.
TIAN Xiao-qing, ZHANG Hu-cai, SUN Hui-ling. Distribution characteristic and its influencing factors of branched tetraether lipids in water columns of Lake Fuxian. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(10): 5766-5775.
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