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首页> 外文期刊>Science of the total environment >Soil microbial CO_2 fixation plays a significant role in terrestrial carbon sink in a dryland ecosystem: A four-year small-scale field-plot observation on the Tibetan Plateau
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Soil microbial CO_2 fixation plays a significant role in terrestrial carbon sink in a dryland ecosystem: A four-year small-scale field-plot observation on the Tibetan Plateau

机译：土壤微生物CO_2固定在旱地生态系统中对陆地碳汇发挥着重要作用：对藏高原的四年小规模的场 - 地图观察

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摘要

Assessment of the global terrestrial carbon (C) sink remains uncertain, and the uncertainty is largely derived from dryland ecosystems. Here we investigated the uncertainty and dynamics of gross primary productivity (GPP) by distinguishing the contributions of soil microbial primary producers and plants to CO_2 fixation during four sequential growing seasons in a fragile dry grassland on the Tibetan Plateau. The results demonstrated that soil microbial GPP consistently accounted for a high proportion of plant GPP (18.2%), and both exhibited similar seasonal patterns during the four-year observation. Soil microbial GPP demonstrated a much greater interannual variation (76.1%) than plant GPP (15.1%), indicating that the interannual GPP uncertainty could be largely from microbial primary producers. Regression analysis indicated that plant GPP had higher sensitivity (demonstrated by slope) than soil microbial GPP to both soil water content and temperature. The GPP ratio of soil microbes to plants also demonstrated a clear seasonal change, and peaked in July in the four-year observation, with a minimum interannual variation (6.8%). The GPP ratio enhanced with increasing soil water content (P < 0.001), but did not correlate with soil temperature. Our findings suggest the great potential of soil microbial GPP, and challenge the plant-oriented models of terrestrial C estimation, which account for plant GPP but ignore soil microbial GPP. Thus, a more robust framework needs to incorporate both soil microbial and plant GPPs for accurately assessing C balance.
机译：评估全球陆地碳（C）汇仍然不确定，不确定性主要来自旱地生态系统。在这里，我们通过将土壤微生物初级生产者和植物在藏长草原上的四个顺序生长季节中区分土壤微生物初级生产者和植物对CO_2固定的贡献来调查了总初级生产力（GPP）的不确定性和动态。结果表明，土壤微生物GPP始终占植物GPP的高比例（18.2％），并且在四年观察期间两者都表现出类似的季节性模式。土壤微生物GPP比植物GPP（15.1％）展示了更高的持续变化（76.1％），表明续年的GPP不确定性可能主要来自微生物初级生产商。回归分析表明，植物GPP比土壤微生物含量和温度较高的敏感性（斜坡展示）具有更高的敏感性（斜坡）。土壤微生物与植物的GPP比例也表明了清晰的季节变化，7月份在四年观察中达到了峰值，最小持续变化（6.8％）。随着土壤含水量增加（P <0.001）而增强了GPP比率，但与土壤温度无关。我们的研究结果表明土壤微生物GPP的巨大潜力，并挑战植物导向的陆地C估计模型，其占植物GPP但忽略了土壤微生物GPP。因此，更强大的框架需要纳入土壤微生物和植物GPP，以准确评估C平衡。

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  • 来源
    《Science of the total environment》 |2021年第20期|143282.1-143282.7|共7页
  • 作者

    Hao Chen; Fei Wang; Weidong Kong; Hongzeng Jia; Tianqi Zhou; Ri Xu; Guangjian Wu; Junbo Wang; Jinshui Wu;

  • 作者单位

    Key Laboratory of Alpine Ecology Institute of Tibetan Plateau Research Chinese Academy of Sciences (CAS) Beijing 100101 China;

    Key Laboratory of Alpine Ecology Institute of Tibetan Plateau Research Chinese Academy of Sciences (CAS) Beijing 100101 China College of Resources and Environment University of Chinese Academy of Sciences Beijing 100049 China;

    Key Laboratory of Alpine Ecology Institute of Tibetan Plateau Research Chinese Academy of Sciences (CAS) Beijing 100101 China CAS Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of Sciences Beijing 100101 China College of Resources and Environment University of Chinese Academy of Sciences Beijing 100049 China;

    Key Laboratory of Alpine Ecology Institute of Tibetan Plateau Research Chinese Academy of Sciences (CAS) Beijing 100101 China College of Resources and Environment University of Chinese Academy of Sciences Beijing 100049 China;

    Key Laboratory of Alpine Ecology Institute of Tibetan Plateau Research Chinese Academy of Sciences (CAS) Beijing 100101 China College of Resources and Environment University of Chinese Academy of Sciences Beijing 100049 China;

    Key Laboratory of Alpine Ecology Institute of Tibetan Plateau Research Chinese Academy of Sciences (CAS) Beijing 100101 China CAS Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of Sciences Beijing 100101 China;

    CAS Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of Sciences Beijing 100101 China Key Laboratory of Tibetan Environment Changes and Land Surface Processes Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing 100101 China;

    CAS Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of Sciences Beijing 100101 China Key Laboratory of Tibetan Environment Changes and Land Surface Processes Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing 100101 China;

    Key Laboratory of Agro-ecological Processes in Subtropical Region Institute of Subtropical Agriculture Chinese Academy of Sciences Changsha 410125 China;

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  • 正文语种 eng
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  • 关键词

    Dry grassland; Gross primary productivity; Microbial primary producers; CO_2 fixation; Soil carbon; Tibetan Plateau;

    机译：干草草;初级生产力;微生物初级生产者;co_2固定;土壤碳;西藏高原;

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