Methane cycling in temperate forests

IF 3.9 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Carbon Balance and Management Pub Date : 2024-10-22 DOI:10.1186/s13021-024-00283-z
Kathryn Wigley, Charlotte Armstrong, Simeon J. Smaill, Nicki M. Reid, Laura Kiely, Steve A. Wakelin
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Abstract

Temperate forest soils are considered significant methane (CH4) sinks, but other methane sources and sinks within these forests, such as trees, litter, deadwood, and the production of volatile organic compounds are not well understood. Improved understanding of all CH4 fluxes in temperate forests could help mitigate CH4 emissions from other sources and improve the accuracy of global greenhouse gas budgets. This review highlights the characteristics of temperate forests that influence CH4 flux and assesses the current understanding of the CH4 cycle in temperate forests, with a focus on those managed for specific purposes. Methane fluxes from trees, litter, deadwood, and soil, as well as the interaction of canopy-released volatile organic compounds on atmospheric methane chemistry are quantified, the processes involved and factors (biological, climatic, management) affecting the magnitude and variance of these fluxes are discussed. Temperate forests are unique in that they are extremely variable due to strong seasonality and significant human intervention. These features control CH4 flux and need to be considered in CH4 budgets. The literature confirmed that temperate planted forest soils are a significant CH4 sink, but tree stems are a small CH4 source. CH4 fluxes from foliage and deadwood vary, and litter fluxes are negligible. The production of volatile organic compounds could increase CH4’s lifetime in the atmosphere, but current in-forest measurements are insufficient to determine the magnitude of any effect. For all sources and sinks more research is required into the mechanisms and microbial community driving CH4 fluxes. The variability in CH4 fluxes within each component of the forest, is also not well understood and has led to overestimation of CH4 fluxes when scaling up measurements to a forest or global scale. A roadmap for sampling and scaling is required to ensure that all CH4 sinks and sources within temperate forests are accurately accounted for and able to be included in CH4 budgets and models to ensure accurate estimates of the contribution of temperate planted forests to the global CH4 cycle.

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温带森林的甲烷循环。
温带森林土壤被认为是重要的甲烷(CH4)汇,但人们对这些森林中的其他甲烷源和汇(如树木、枯枝落叶、枯木和挥发性有机化合物的产生)还不甚了解。加深对温带森林中所有甲烷通量的了解有助于减少其他来源的甲烷排放,并提高全球温室气体预算的准确性。本综述强调了影响甲烷通量的温带森林特征,并评估了目前对温带森林甲烷循环的了解,重点关注那些为特定目的而管理的森林。对来自树木、枯枝落叶、枯死木和土壤的甲烷通量以及树冠释放的挥发性有机化合物与大气甲烷化学的相互作用进行了量化,并讨论了影响这些通量的大小和差异的相关过程和因素(生物、气候、管理)。温带森林的独特之处在于,由于强烈的季节性和大量的人为干预,它们的变化非常大。这些特点控制着甲烷通量,需要在甲烷预算中加以考虑。文献证实,温带人工林土壤是一个重要的甲烷汇,但树茎是一个很小的甲烷源。树叶和枯木的甲烷通量各不相同,而枯枝落叶的通量可以忽略不计。挥发性有机化合物的产生可能会延长 CH4 在大气中的停留时间,但目前的森林测量不足以确定任何影响的大小。对于所有源和汇,都需要对驱动 CH4 通量的机制和微生物群落进行更多研究。人们对森林各组成部分内 CH4 通量的变化也不甚了解,这导致在将测量结果放大到森林或全球范围时高估了 CH4 通量。需要制定一个采样和放大路线图,以确保温带森林中的所有甲烷汇和源都得到准确计算,并能够纳入甲烷预算和模型中,从而确保准确估算温带人工林对全球甲烷循环的贡献。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Carbon Balance and Management
Carbon Balance and Management Environmental Science-Management, Monitoring, Policy and Law
CiteScore
7.60
自引率
0.00%
发文量
17
审稿时长
14 weeks
期刊介绍: Carbon Balance and Management is an open access, peer-reviewed online journal that encompasses all aspects of research aimed at developing a comprehensive policy relevant to the understanding of the global carbon cycle. The global carbon cycle involves important couplings between climate, atmospheric CO2 and the terrestrial and oceanic biospheres. The current transformation of the carbon cycle due to changes in climate and atmospheric composition is widely recognized as potentially dangerous for the biosphere and for the well-being of humankind, and therefore monitoring, understanding and predicting the evolution of the carbon cycle in the context of the whole biosphere (both terrestrial and marine) is a challenge to the scientific community. This demands interdisciplinary research and new approaches for studying geographical and temporal distributions of carbon pools and fluxes, control and feedback mechanisms of the carbon-climate system, points of intervention and windows of opportunity for managing the carbon-climate-human system. Carbon Balance and Management is a medium for researchers in the field to convey the results of their research across disciplinary boundaries. Through this dissemination of research, the journal aims to support the work of the Intergovernmental Panel for Climate Change (IPCC) and to provide governmental and non-governmental organizations with instantaneous access to continually emerging knowledge, including paradigm shifts and consensual views.
期刊最新文献
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