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.

Kathryn Wigley

Charlotte Armstrong

Simeon J. Smaill

Nicki M. Reid

Laura Kiely

Steve A. Wakelin

Carbon Balance and Management

碳平衡与管理是一本开放获取、同行评议的在线期刊，涵盖研究的各个方面，旨在制定与理解全球碳循环相关的综合政策。全球碳循环涉及气候、大气二氧化碳和碳循环之间的重要耦合。陆地和海洋生物圈。由于气候和大气成分的变化而导致的当前碳循环转变被广泛认为对生物圈和人类福祉具有潜在危险，因此监测、理解和预测碳循环的演变整个生物圈（陆地和海洋）都是对科学界的挑战。这需要跨学科研究和新方法来研究碳库和通量的地理和时间分布、碳气候系统的控制和反馈机制、干预点和管理碳 - 气候 - 人类系统的机会之窗。碳平衡和管理是该领域研究人员跨学科界限传达其研究结果的媒介。通过传播研究，该期刊旨在支持政府间气候变化专门委员会 (IPCC) 的工作，并为政府和非政府组织提供即时获取不断涌现的知识的途径，包括范式转变和共识观点。

Carbon Balance and Management is an open-access, peer-reviewed online journal that covers all aspects of research related to the global carbon cycle, aiming to formulate and understand comprehensive policies. The global carbon cycle involves significant couplings between climate, atmospheric carbon dioxide, and the terrestrial and marine biospheres. The current transformations in the carbon cycle, driven by changes in climate and atmospheric composition, are widely regarded as posing potential threats to the biosphere and human well-being. Therefore, monitoring, understanding, and predicting the evolution of the carbon cycle across the entire biosphere (land and ocean) presents a major challenge for the scientific community. This requires interdisciplinary research and new methodologies to investigate the geographical and temporal distribution of carbon stocks and fluxes, the controls and feedback mechanisms of the carbon-climate system, as well as intervention points and windows of opportunity for managing the carbon-climate-human system. Carbon Balance and Management serves as a medium for researchers in this field to communicate their findings across disciplinary boundaries. By disseminating research, the journal aims to support the work of the Intergovernmental Panel on Climate Change (IPCC) and provide governments and non-governmental organizations with immediate access to emerging knowledge, including paradigm shifts and consensus viewpoints.

《Carbon Balance and Management》是一本开放获取、同行评审的在线期刊，涵盖与全球碳循环相关的各个研究领域，旨在制定和理解综合政策。全球碳循环涉及气候、大气二氧化碳和陆地与海洋生物圈之间的重要耦合。由于气候变化和大气成分的变化，当前碳循环的转变被广泛认为对生物圈和人类福祉构成潜在威胁。因此，监测、理解和预测碳循环在整个生物圈（包括陆地和海洋）的演变，成为科学界面临的一项重大挑战。这需要跨学科的研究和新方法，以研究碳库和通量的地理和时间分布、碳气候系统的控制与反馈机制，以及管理碳-气候-人类系统的干预点和机会窗口。《Carbon Balance and Management》为该领域的研究人员提供了一个跨学科交流研究成果的平台。通过传播研究成果，该期刊旨在支持政府间气候变化专门委员会（IPCC）的工作，并为政府和非政府组织提供获取不断涌现的知识的途径，包括范式转变和共识观点。

Category	Quartile
环境科学与生态学	3
环境科学与生态学, 环境科学	3

Methane cycling in temperate forests

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Journal Info

Category	Quartile
ENVIRONMENTAL SCIENCES	2