Methane emissions from tree stems: a new frontier in the global carbon cycle
Methane emissions from tree stems: a new frontier in the global carbon cycle
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DOI：
10.1111/nph.15582
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发表时间：
2019-04-01
期刊：
影响因子：
9.4
通讯作者：
Vargas, Rodrigo
中科院分区：
文献类型：
--
作者：
Barba, Josep;Bradford, Mark A.;Vargas, Rodrigo
湿地、河漫滩和高地森林的树干可以产生和排放甲烷。树木CH 4茎排放具有很高的空间和时间变异性，但没有共识的生物物理机制，驱动茎CH 4的生产和排放。在这里，我们总结了干甲烷排放研究的30个机遇和挑战，这些机遇和挑战一旦得到解决，将改善对甲烷排放量、模式和驱动因素的估计，并追踪其潜在来源。我们确定了以下需求：（1）对树干甲烷排放量进行长期、高频率的测量，以了解精细尺度的过程，同时进行快速的大尺度测量，以了解个体、物种和生态系统之间的变异性;（2）查明与甲烷产生有关的微生物和生物地球化学途径;（3）建立了土壤-树木-大气连续体中CH 4被动和主动输运的机理模型。应对这些挑战将有助于限制甲烷排放的规模和格局，并将甲烷生产和排放的途径和机制纳入基于过程的模型。这些进展将促进将干甲烷排放量扩大到生态系统一级，并量化干甲烷排放量对地方到全球甲烷预算的作用。
Tree stems from wetland, floodplain and upland forests can produce and emit methane (CH4). Tree CH4 stem emissions have high spatial and temporal variability, but there is no consensus on the biophysical mechanisms that drive stem CH4 production and emissions. Here, we summarize up to 30 opportunities and challenges for stem CH4 emissions research, which, when addressed, will improve estimates of the magnitudes, patterns and drivers of CH4 emissions and trace their potential origin. We identified the need: (1) for both long-term, high-frequency measurements of stem CH4 emissions to understand the fine-scale processes, alongside rapid large-scale measurements designed to understand the variability across individuals, species and ecosystems; (2) to identify microorganisms and biogeochemical pathways associated with CH4 production; and (3) to develop a mechanistic model including passive and active transport of CH4 from the soil-tree-atmosphere continuum. Addressing these challenges will help to constrain the magnitudes and patterns of CH4 emissions, and allow for the integration of pathways and mechanisms of CH4 production and emissions into process-based models. These advances will facilitate the upscaling of stem CH4 emissions to the ecosystem level and quantify the role of stem CH4 emissions for the local to global CH4 budget.