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首页> 外文期刊>Environmental Science & Technology >Macroalgal Blooms Trigger the Breakdown of Seagrass Blue Carbon
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Macroalgal Blooms Trigger the Breakdown of Seagrass Blue Carbon

机译：Macroalgal Blooms触发海草蓝碳的细分

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摘要

Intensive macroalgal blooms, a source of labile organic carbon (LOC) induced by coastal nutrient loading in some seagrass ecosystems, create ideal conditions for enhanced recalcitrant organic carbon (ROC) loss via the cometabolism effect. Here, we carried out a 62-day laboratory experiment to see if density-dependent addition of macroalgal biomass can influence the seagrass decomposition process, including seagrass detritus carbon chemistry, greenhouse emissions, and bacterial communities. We found that higher density macroalgal addition stimulated microbes to decompose ～20% more of the seagrass biomass compared to other treatments, which was also reflected in enhanced (^twofold) greenhouse gas emissions. Although the composition of the seagrass-associated microbiome communities was unaffected by the addition of macroalgae, we showed that high macroalgal addition caused a relative depletion in the ROC as lignin and lipid compounds, as well as <513C depletion and <51SN enrichment of the seagrass detritus. These results suggest that macroalgal blooms may stimulate the remineralization of recalcitrant components of seagrass detritus via cometabolism, possibly through providing available energy or resources for the synthesis of ROC-degrading enzymes within the resident microbial population. This study provides evidence that cometabolism can be a mechanism for leading to reduced seagrass blue carbon sequestration and preservation.
机译：密集型大型绽放，在一些海草生态系统中沿海营养加载引起的不稳定有机碳（LOC）的源，通过Cometabolism效应创造了增强的顽抗有机碳（ROC）损失的理想条件。在这里，我们进行了62天的实验室实验，看看密度依赖性的大类生物量是否会影响海草分解过程，包括海草脱碳碳化学，温室排放和细菌社区。我们发现，与其他治疗相比，较高密度的大甲蛋白添加刺激的微生物以与其他处理相比分解〜20％的〜20％，其也反映在增强（^双重）温室气体排放中。虽然海草相关的微生物组群的组成不受加入大草种的影响，但我们表明高分子添加引起ROC作为木质素和脂质化合物的相对枯竭，以及<513C耗尽和<51℃的海草富集Detritus。这些结果表明，Macroalgal Blooms可以通过Cometabolism刺激海草乳剂的顽固组分，可能通过提供用于合成驻留微生物群体内的Roc降解酶的可用能量或资源。本研究提供了Cometabolism可以成为导致海草蓝碳封存和保存的机制。

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  • 来源
    《Environmental Science & Technology》 |2020年第22期|14750-14760|共11页
  • 作者

    Songlin Liu; Stacey M. Trevathan-Tackett; Carolyn J. Ewers Lewis; Xiaoping Huang; Peter I. Macreadie;

  • 作者单位

    Key Laboratory of Tropical Marine Bio-resources and Ecology South China Sea Institute of Oceanology and Innovation Academy of South China Sea Ecology and Environmental Engineering Chinese Academy of Sciences Guangzhou 510301 China School of Life and Environmental Sciences Centre for Integrative Ecology Deakin University Burwood Victoria 3125 Australia;

    School of Life and Environmental Sciences Centre for Integrative Ecology Deakin University Burwood Victoria 3I2S Australia;

    School of Life and Environmental Sciences Centre for Integrative Ecology Deakin University Burwood Victoria 3125 Australia Department of Environmental Sciences University of Virginia Charlottesville Virginia 22911 United States;

    Key Laboratory of Tropical Marine Bio-resources and Ecology South China Sea Institute of Oceanology and Innovation Academy of South China Sea Ecology and Environmental Engineering Chinese Academy of Sciences Guangzhou510301 China;

    School of Life and Environmental Sciences Centre for Integrative Ecology Deakin University Burwood Victoria 3125 Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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