Modern carbon burial in Lake Qinghai,China |
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| Institution: | 1. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing Normal University, Nanjing 210023, China;2. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210023, China;3. Key Laboratory of Virtual Geographic Environment (Nanjing Normal University), Ministry of Education, Nanjing 210023, China;4. School of Geography Science, Nanjing Normal University, Nanjing 210023, China;5. State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, China;6. Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210023, China;7. Department of Geography, University of Wisconsin, Madison, WI 53706, USA;1. School of Environment Science and Spatial Information, Suzhou University, Suzhou 234000, PR China;2. School of Geography Science, Nanjing Normal University, Nanjing 210023, PR China;3. State Key Laboratory of Environment Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;4. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing Normal University, Nanjing 210023, PR China;5. Key Laboratory of Virtual Geographic Environment (Nanjing Normal University), Ministry of Education, Nanjing 210023, PR China;6. State Key Laboratory Cultivation Base of Geographical Environment Evolution (Jiangsu Province), Nanjing 210023, PR China;7. Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, PR China;8. School of Earth System Science, Tianjin University, Tianjin 300072, PR China;1. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing Normal University, Nanjing 210023, China;2. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210023, China;3. Key Laboratory of Virtual Geographic Environment (Nanjing Normal University), Ministry of Education, Nanjing 210023, China;4. School of geography science, Nanjing Normal University, Nanjing 210023, China;5. Department of Geography, University of Wisconsin, Madison, Wisconsin 53706, USA;6. School of Biochemical and Environmental Engineering, Nanjing Xiao Zhuang University, Nanjing 210046, China;1. College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China;2. State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;3. Advanced Interdisciplinary Institute of Environment and Ecology, Beijing Normal University, Zhuhai 519087, China;1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, CAS, Guiyang 550081, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Puding Karst Ecosystem Research Station, Chinese Ecosystem Research Network, CAS, Puding 562100, Guizhou, China;4. CAS Center for Excellence in Quaternary Science and Global Change, 710061 Xi''an, China;5. School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China;6. Resources and Environmental Engineering, Guizhou Institute of Technology, Guiyang 550008, Guizhou, China |
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| Abstract: | The quantification of carbon burial in lake sediments, and carbon fluxes derived from different origins are crucial to understand modern lacustrine carbon budgets, and to assess the role of lakes in the global carbon cycle. In this study, we estimated carbon burial in the sediment of Lake Qinghai, the largest inland lake in China, and the carbon fluxes derived from different origins. We find that: (1) The organic carbon burial rate in lake sediment is approximately 7.23 g m?2 a?1, which is comparable to rates documented in many large lakes worldwide. We determined that the flux of riverine particulate organic carbon (POC) is approximately 10 times higher than that of dissolved organic carbon (DOC). Organic matter in lake sediments is primarily derived from POC in lake water, of which approximately 80% is of terrestrial origin. (2) The inorganic carbon burial rate in lake sediment is slightly higher than that of organic carbon. The flux of riverine dissolved inorganic carbon (DIC) is approximately 20 times that of DOC, and more than 70% of the riverine DIC is drawn directly and/or indirectly from atmospheric CO2. (3) Both DIC and DOC are concentrated in lake water, suggesting that the lake serves as a sink for both organic and inorganic carbon over long term timescales. (4) Our analysis suggests that the carbon burial rates in Lake Qinghai would be much higher in warmer climatic periods than in cold ones, implying a growing role in the global carbon cycle under a continued global warming scenario. |
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