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首页> 外文期刊>Journal of soils & sediments >Enhanced mineralization of sedimentary organic carbon induced by excess carbon from phytoplankton in a eutrophic plateau lake
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Enhanced mineralization of sedimentary organic carbon induced by excess carbon from phytoplankton in a eutrophic plateau lake

机译：来自富营养化高原湖中浮游植物的过量碳诱导的沉积有机碳的增强矿化

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摘要

Purpose Large additions of organic carbon (OC) have been introduced into the carbon cycle of lakes from algae during the process of lake eutrophication. The impact of eutrophication on OC burial and CO2 fixing has been widely studied; however, there is still a gap regarding the impact of excess OC from algae on sedimentary OC mineralization. In this study, we aim to fill this gap by analyzing in situ measurements.Materials and methods Three pairs of sediment cores collected from a plateau lake (Dianchi Lake) in 2006 and 2014 were used to estimate the accumulation loss rate (ALR) of OC (and thus the total mineralization rate) in the sediment. n-Alkanes, measured from the same sedimentary cores, were used to identify the source of OC. An OC mineralization experiment in a laboratory was used to confirm the enhanced effect of excess phytoplankton carbon on ALR and reveal the potential influence of microorganisms.Results and discussion The results indicate that the sedimentary core (core 3), with high excess OC from algae (located in an algal bloom area), possessed a higher ALR (85.66%) and a higher attenuation coefficient (0.078), indicating the low burial efficiency and short mineralization duration of OC. Sedimentary core 1, controlled by terrestrial OC, had a relatively lower ALR (64.60%) and lower attenuation coefficient (0.029), indicating a high burial efficiency and long period of OC mineralization. The mineralization of OC in core 2 was impacted by terrestrial and endogenous OC, with an ALR of 72.00% and attenuation coefficient of 0.064, which is between that of cores 1 and 3. Excess OC from algae corresponded to an increase in ALR by 32.60% when comparing core 1 to core 3. The increased ALR and attenuation coefficient could be caused by excess OC from algae.Conclusions Sedimentary OC mineralization indicates that the ALR with dominantly allochthonous OC (64.60%) is much lower than that controlled by autochthonous OC (85.66%). Excess OC from phytoplankton increases the mineralization of OC: not only via increased ALR but also increased mineralization speed. The laboratory experiment on the mixture of algae and sediment suggested that excess phytoplankton OC increased the emission of CO2 by 20-70% (mineralization rate).
机译：目的在富营养化湖过程中，已经引入了从藻类的湖泊的碳循环中加入了大量的有机碳（OC）。富营养化对OC墓葬和二氧化碳固定的影响已被广泛研究;然而，关于沉积oC矿化对藻类的过度抗体的影响仍然存在差距。在这项研究中，我们的目的是通过原位测量分析来填补这种差距。使用2006年和2014年从高原湖（滇池）收集的三对沉积物核心用于估计OC的累积损失率（ALR） （并因此是沉积物中的总矿化率）。从相同沉积芯中测量的N-烷烃用于鉴定OC的来源。实验室中的OC矿化实验用于确认过量的浮游植物碳在ALR上的增强效果，揭示微生物的潜在影响。结果和讨论结果表明，沉积核（核心3），来自藻类的高过量OC（位于藻类绽放区域，具有更高的ALR（85.66％）和更高的衰减系数（0.078），表明胚胎效率低，矿化持续时间短。由陆地oC控制的沉积核心1具有相对较低的ALR（64.60％）和较低的衰减系数（0.029），表明高埋藏效率和长期的OC矿化。核心2中OC的矿化受陆地和内源性OC的影响，ALL为72.00％和衰减系数为0.064，这在核1和3的核之间之间的含量与藻类过多的OC之间相当于32.60％的ALR增加当将核心1比较到核心3时。增加的AL和衰减系数可能是由于藻类过量的抗体引起的。结论沉积OC矿化表明ALR具有显着的表型oc（64.60％）远低于Autochthonous OC控制的ALR（85.66 ％）。来自浮游植物的过量的OC增加了OC的矿化：不仅通过增加的ALR，而且还增加了矿化速度。藻类和沉积物混合物的实验室实验表明，过量的浮游植物OC将二氧化碳的排放增加20-70％（矿化率）。

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  • 来源
    《Journal of soils & sediments》 |2019年第5期|2613-2623|共11页
  • 作者

    Huang Changchun; Chen Zhili; Gao Yan; Luo Yang; Huang Tao; Zhu Axing; Yang Hao; Yang Benjun;

  • 作者单位

    Nanjing Normal Univ Jiangsu Ctr Collaborat Innovat Geog Informat Reso Nanjing 210023 Jiangsu Peoples R China|Chinese Acad Sci Nanjing Inst Geog & Limnol State Key Lab Lake Sci & Environm Nanjing 210023 Jiangsu Peoples R China|Nanjing Normal Univ Minist Educ Key Lab Virtual Geog Environm Nanjing 210023 Jiangsu Peoples R China|Nanjing Normal Univ Sch Geog Sci Nanjing 210023 Jiangsu Peoples R China;

    Nanjing Normal Univ Sch Geog Sci Nanjing 210023 Jiangsu Peoples R China;

    Nanjing Normal Univ Sch Geog Sci Nanjing 210023 Jiangsu Peoples R China;

    Nanjing Normal Univ Sch Geog Sci Nanjing 210023 Jiangsu Peoples R China;

    Nanjing Normal Univ Jiangsu Ctr Collaborat Innovat Geog Informat Reso Nanjing 210023 Jiangsu Peoples R China|Nanjing Normal Univ Sch Geog Sci Nanjing 210023 Jiangsu Peoples R China;

    Nanjing Normal Univ Jiangsu Ctr Collaborat Innovat Geog Informat Reso Nanjing 210023 Jiangsu Peoples R China|Nanjing Normal Univ Minist Educ Key Lab Virtual Geog Environm Nanjing 210023 Jiangsu Peoples R China|Univ Wisconsin Dept Geog Madison WI 53706 USA;

    Nanjing Normal Univ Jiangsu Ctr Collaborat Innovat Geog Informat Reso Nanjing 210023 Jiangsu Peoples R China|Nanjing Normal Univ Sch Geog Sci Nanjing 210023 Jiangsu Peoples R China;

    West Anhui Univ Sch Environm & Tourism Luan 237000 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Algal blooms; Carbon cycling; Dianchi Lake; Sources of organic carbon;

    机译：藻类盛开;碳循环;滇池;有机碳的来源;

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