A high-resolution record of Holocene primary productivity and water-column mixing from the varved sediments of Lake Zabinskie, Poland

被引:0
|
作者
Zander, Paul D. [1 ,2 ]
Zarczynski, Maurycy [3 ]
Vogel, Hendrik [2 ,4 ]
Tylmann, Wojciech [3 ]
Wacnik, Agnieszka [5 ]
Sanchini, Andrea [1 ,2 ]
Grosjean, Martin [1 ,2 ]
机构
[1] Univ Bern, Inst Geog, Bern, Switzerland
[2] Univ Bern, Oeschger Ctr Climate Change Res, Bern, Switzerland
[3] Univ Gdansk, Fac Oceanog & Geog, Gdansk, Poland
[4] Univ Bern, Inst Geol Sci, Bern, Switzerland
[5] Polish Acad Sci, W Szafer Inst Bot, Krakow, Poland
基金
瑞士国家科学基金会;
关键词
Hyperspectral imaging; Pigments; Varves; Anoxia; Eutrophication; Holocene; NORTH-EASTERN POLAND; ENVIRONMENTAL-CHANGES; NE POLAND; VEGETATION DEVELOPMENT; LEVEL FLUCTUATIONS; ORGANIC-MATTER; CLIMATE-CHANGE; POLLEN; TEMPERATURE; PIGMENTS;
D O I
10.1016/j.scitotenv.2020.143713
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Eutrophication and anoxia are increasing in lakes worldwide. However, our understanding of variations of primary productivity and anoxia in lakes over thousands of years is limited. Long-term records are needed to understand the natural variability of lake ecosystems and to improve our understanding of drivers of productivity and anoxia. In this study, we used the varved sediment record of Lake Zabinskie, Poland to answer the following research questions: 1) How have primary production and water column oxygen concentrations varied during the past 10,800 years?; 2) what role did natural and anthropogenic forces have in driving changes in primary production or lake mixing regime? Recently developed hyperspectral imaging (HSI) techniques were used to quantify sedimentary chloropigments-a and bacteriopheopigments-a (Bphe-a) at sub-annual resolution. These data, combined with elemental data from micro X-ray fluorescence (mu-XRF) and pigment assemblage data from high-performance liquid chromatography (HPLC) measurements, were used to reconstruct paleolimnological conditions. Bphe-a was used as an indicator of anoxia, and its presence suggests that an extensive anoxic zone was present nearly continuously from 10.8 to 2.8 ka BP. Anoxic conditions, driven by thermal stratification, were promoted by closed forest cover during that time, which limited wind-driven mixing of the water column. After 2.8 ka BP, water column oxygenation occurred more frequently, particularly during periods of increased human agricultural activity and forest opening. Pronounced anoxia was again present continuously from similar to 610 to 1470 CE, concurrent with a period of reforestation. After similar to 1610 CE, deforestation caused increases in erosion rates, algal production, and water column oxygenation. Pigment assemblages indicate that the algal community during the past 150 years was different from any other time during theHolocene. This study demonstrates a clear link between lake biogeochemical processes and forest cover and shows the potential of HSI to produce extremely high-resolution records of past productivity and redox conditions from varved lake sediments. (c) 2020 The Author(s). Published by Elsevier B.V.
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页数:16
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