期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 550, 期 -, 页码 225-230出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2016.01.088
关键词
Carbonate weathering; Eutrophic alkaline lake; Carbon burial; Calcite precipitation; Stable isotope analysis; Algal C-uptake
资金
- Estonian Ministry of Education and Research [IUT 21-02]
- Estonian Science Foundation [9102]
- MARS project (Managing Aquatic ecosystems and water Resources under multiple Stress) - 7th EU Framework Program [603378]
- Swiss Grant for Program Enhancing public environmental monitoring capacities
For a long time, lakes were considered unimportant in the global carbon (C) cycle because of their small total area compared to the ocean. Over the last two decades, a number of studies have highlighted the important role of lakes in both sequestering atmospheric C and modifying the C flux from the catchment by degassing CO2 and methane and burying calcite and organic matter in the sediment. Based on a full C mass balance, high frequency measurements of lake metabolism and stable isotope analysis of a large shallow eutrophic lake in Estonia, we assess the role alkaline lakes play in augmenting the strength of terrestrial carbonate weathering as a temporary CO2 sink. We show that a large part of organic C buried in the sediments in this type of lakes originates from the catchment although a direct uptake from the atmosphere during periods of intensive phytoplankton growth in eutrophic conditions contributes to the carbon sink. (C) 2016 Elsevier B.V. All rights reserved.
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