The importance of plants for methane emission at the ecosystem scale
The importance of plants for methane emission at the ecosystem scale
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DOI：
10.1016/j.aquabot.2022.103596
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发表时间：
2022-11-18
期刊：
影响因子：
1.8
通讯作者：
Sawakuchi, Henrique Oliveira
中科院分区：
文献类型：
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作者：
Bastviken, David;Treat, Claire C.;Sawakuchi, Henrique Oliveira
甲烷（CH4）是大气中主要的长寿命温室气体之一，主要由有机物质产生。因此，有机物的净初级生产确定了甲烷排放量的界限。植物是主要的初级生产者，因此间接地维持了全球大部分的甲烷排放，尽管在时间上有延迟，植物初级生产与随后的甲烷排放之间也有空间上的抵消。此外，植物群落可以以多种方式增强或阻碍生态系统的CH4生产、氧化和运输，例如，通过塑造碳、营养和氧化还原梯度，并通过代表缺氧沉积物或土壤中大量产生CH4的区域与大气之间的物理联系。本综述着重于植物和其他初级生产者如何影响CH4排放，并在生态系统尺度上产生后果。我们概述了相互作用的机制，并讨论了通量调节，量化和知识差距在多个生态系统的例子。最近提出的一些植物相关的生态系统CH4通量是难以调和的全球大气CH4的预算和谜有关这些通量的突出。总体而言，生态系统甲烷排放量与初级生产者社区直接或间接密切相关，适当量化这些联系的数量和监管是在迅速变化的世界中预测未来甲烷排放量的关键。
Methane (CH4), one of the key long-lived atmospheric greenhouse gases, is primarily produced from organic matter. Accordingly, net primary production of organic matter sets the boundaries for CH4 emissions. Plants, being dominant primary producers, are thereby indirectly sustaining most global CH4 emissions, albeit with delays in time and with spatial offsets between plant primary production and subsequent CH4 emission. In addition, plant communities can enhance or hamper ecosystem production, oxidation, and transport of CH4 in multiple ways, e.g., by shaping carbon, nutrient, and redox gradients, and by representing a physical link be-tween zones with extensive CH4 production in anoxic sediments or soils and the atmosphere. This review focuses on how plants and other primary producers influence CH4 emissions with the consequences at ecosystem scales. We outline mechanisms of interactions and discuss flux regulation, quantification, and knowledge gaps across multiple ecosystem examples. Some recently proposed plant-related ecosystem CH4 fluxes are difficult to reconcile with the global atmospheric CH4 budget and the enigmas related to these fluxes are highlighted. Overall, ecosystem CH4 emissions are strongly linked to primary producer communities, directly or indirectly, and properly quantifying magnitudes and regulation of these links are key to predicting future CH4 emissions in a rapidly changing world.