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  • Holocene carbon accumulation in lakes of the current east Asian monsoonal margin: Implications under a changing climate

    Author(s)
    Hao, Qian
    Yang, Shilei
    Song, Zhaoliang
    Ran, Xiangbin
    Yu, Changxun
    Chen, Chunmei
    Van Zwieten, Lukas
    Quine, Timothy A
    Liu, Hongyan
    Wang, Zhengang
    Wang, Hailong
    Griffith University Author(s)
    Van Zwieten, Lukas
    Year published
    2020
    Metadata
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    Abstract
    Carbon (C) present in lake sediments is an important global sink for CO2; however, an in-depth understanding of the impact of climate variability and the associated changes in vegetation on sediment C dynamics is still lacking. A total of 13 lakes were studied to quantify the influence of climate and vegetation on the reconstructed Holocene C accumulation rate (CAR) in lake sediments of the modern East Asian monsoonal margin. The corresponding paleoclimate information was assessed, including the temperature (30-90°N in the Northern Hemisphere) and precipitation (indicated by the δ18O of the Sanbao, Dongge, and Hulu caves). ...
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    Carbon (C) present in lake sediments is an important global sink for CO2; however, an in-depth understanding of the impact of climate variability and the associated changes in vegetation on sediment C dynamics is still lacking. A total of 13 lakes were studied to quantify the influence of climate and vegetation on the reconstructed Holocene C accumulation rate (CAR) in lake sediments of the modern East Asian monsoonal margin. The corresponding paleoclimate information was assessed, including the temperature (30-90°N in the Northern Hemisphere) and precipitation (indicated by the δ18O of the Sanbao, Dongge, and Hulu caves). The Holocene vegetation conditions were inferred by pollen records, including arboreal pollen/non-arboreal pollen and pollen percentages. The results showed that the peak CAR occurred during the mid-Holocene, coinciding with the strongest period of the East Asian summer monsoon and expansion of forests. Lakes in the temperate steppe (TS) regions had a mean CAR of 13.41 ± 0.88 g C m-2 yr-1, which was significantly greater than the CARs of temperate desert (TD) and highland meadow/steppe (HMS; 6.76 ± 0.29 and 7.39 ± 0.73 g C m-2 yr-1, respectively). The major influencing factor for the TS sub-region was vegetation dynamics, especially the proportion of arboreal vegetation, while temperature and vegetation coverage were more important for the HMS. These findings indicate that C accumulation in lake sediments is linked with climate and vegetation changes over long timescales; however, there was notable spatial heterogeneity in the CARs, such as opposing temporal changes and different major influencing factors among the three sub-regions during the mid-Holocene. Aridification and forest loss would decrease C storage. However, prediction of C accumulation remains difficult because of the spatial heterogeneity in CARs and the interaction between the CAR and various factors under future climate change conditions.
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    Journal Title
    Science of The Total Environment
    Volume
    737
    DOI
    https://doi.org/10.1016/j.scitotenv.2020.139723
    Subject
    Environmental Sciences
    Science & Technology
    Life Sciences & Biomedicine
    Carbon sequestration
    Ecology
    Publication URI
    http://hdl.handle.net/10072/400528
    Collection
    • Journal articles

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