自然生态系统土壤甲烷吸收对全球变化的响应及其机制研究进展

Soil Methane Uptake and Its Response and Mechanism to Global Change in Natural Ecosystems: A Review

  • 摘要: 自然生态系统土壤是大气甲烷 (CH4) 重要的汇。在全球变化背景下,深入研究土壤CH4吸收对全球变化的响应及其机制是准确预测未来自然生态系统土壤CH4汇变化趋势的基础。本文综述了土壤CH4吸收及其对全球变暖、降水格局改变、大气二氧化碳 (CO2) 浓度升高和大气活性氮沉降增加等全球变化因子的响应及内在机制的研究进展,分析了当前研究的不足,并尝试提出未来的研究方向。全球变化可通过影响植物生长和微生物的繁殖以及土壤环境因子调控甲烷氧化菌和产甲烷菌的生长和生理过程,从而影响CH4吸收。由于全球变化因子控制试验的时空分布不均匀性和全球变化因子之间交互作用的复杂性导致其对土壤CH4吸收的调控机制也存在着较大的不确定性,未来研究应注重探讨全球变化因子的交互作用对土壤CH4吸收的影响,更多关注全球变化对土壤CH4吸收的长期影响。

     

    Abstract: Soil in natural ecosystems has the ability to oxidized methane (CH4) and serves as an important sink for atmospheric CH4. In the context of global change, it is crucial to study how soil CH4 uptake responds to global change and the underlying mechanisms, as this forms the basis for accurately predicting future trends in soil CH4 sinks in natural ecosystems. This paper reviewed the research progress on soil CH4 uptake, focusing on its response to and impact mechanisms related to global change factors such as global warming, altering precipitation patterns, rising atmospheric CO2 concentrations, and increasing nitrogen deposition. It also identified gaps in current research and suggested potential future directions. Global change could affect the growth of plants, microorganisms and soil environmental factors, which in turn influences the growth and physiological processes of methanotrophs and methanogens of regulating CH4 uptake. However, due to the uneven spatial and temporal distribution of global change factor controlled experiments and the complexity of interactions between these factors, there was significant uncertainty in the regulatory mechanisms of soil CH4 uptake. Future researched should focus on investigating the combined effects of multiple global change factors on soil CH4 uptake with a greater emphasis on the long-term impacts of global change on this process.

     

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