Distribution characteristic and its influencing factors of branched tetraether lipids in water columns of Lake Fuxian
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.
lake FuxianbrGDGTsspatial and temporal distributiondissolved oxygeninflaencing factors
万方数据
维普
