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Influence of the biological carbon pump effect on the sources and deposition of organic matter in Fuxian Lake, a deep oligotrophic lake in southwest China
Haibo He;  Zaihua Liu;  Chongying Chen;  Yu Wei;  Qian Bao;  Hailong Sun;  Yundi Hu;   Hao Yan
2019
Source PublicationActa Geochimica
Volume38Pages:613–626
Abstract

Biological carbon pumping (BCP) is a key process in which dissolved inorganic carbon in terrestrial aquatic ecosystems is utilized by aquatic autotrophs for photosynthesis and transformed into autochthonous organic matter (AOC). However, the mechanisms underlying BCP and the amount of generated AOC deposited effectively, are still poorly understood. Therefore, we conducted a systematic study combining modern hydrochemical monitoring and a sediment trap experiment in Fuxian Lake (Yunnan, SW China), the second-deepest plateau, oligotrophic freshwater lake in China. Temperature, pH, EC (electrical conductivity), DO (dissolved O2), [HCO3], [Ca2+], SIc, partial CO2 (pCO2) pressure, and carbon isotopic compositions of HCO3 (δ13CDIC) in water from Fuxian Lake all displayed distinct seasonal and vertical variations. This was especially apparent in an inverse correlation between pCO2 and DO, indicating that variations of hydrochemistry in the lake water were mainly controlled by the metabolism of the aquatic phototrophs. Furthermore, the lowest C/N ratios and highest δ13Corg were recorded in the trap sediments. Analyses of the C/N ratio demonstrated that the proportions of AOC ranged from 30% to 100% of all OC, indicating that AOC was an important contributor to sedimentary organic matter (OC). It was calculated that the AOC flux in Fuxian Lake was 20.43 t C km−2 in 2017. Therefore, AOC produced by carbonate weathering and aquatic photosynthesis could potentially be a significant carbon sink and may have an important contribution to solving the lack of carbon sinks in the global carbon cycle.

KeywordCarbonate Weathering hydrochemical Variation biological Carbon Pump Effect sediment Trap autochthonous Organic Carbon Carbon Sink
Indexed ByEI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/10503
Collection环境地球化学国家重点实验室
Affiliation1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, CAS, Guiyang 550081, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
3.CAS Center for Excellence in Quaternary Science and Global Change, Guiyang 550081, China
Recommended Citation
GB/T 7714
Haibo He;Zaihua Liu;Chongying Chen;Yu Wei;Qian Bao;Hailong Sun;Yundi Hu; Hao Yan. Influence of the biological carbon pump effect on the sources and deposition of organic matter in Fuxian Lake, a deep oligotrophic lake in southwest China[J]. Acta Geochimica,2019,38:613–626.
APA Haibo He;Zaihua Liu;Chongying Chen;Yu Wei;Qian Bao;Hailong Sun;Yundi Hu; Hao Yan.(2019).Influence of the biological carbon pump effect on the sources and deposition of organic matter in Fuxian Lake, a deep oligotrophic lake in southwest China.Acta Geochimica,38,613–626.
MLA Haibo He;Zaihua Liu;Chongying Chen;Yu Wei;Qian Bao;Hailong Sun;Yundi Hu; Hao Yan."Influence of the biological carbon pump effect on the sources and deposition of organic matter in Fuxian Lake, a deep oligotrophic lake in southwest China".Acta Geochimica 38(2019):613–626.
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