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Title: Methane production and emissions in trees and forests

Journal Article · · New Phytologist
DOI:https://doi.org/10.1111/nph.15624· OSTI ID:1611021

Contents Summary 35 I. Introduction 36 II. Tree CH 4 fluxes 36 III. Tree emissions of soil‐produced CH 4 40 IV. Tree‐produced CH 4 42 V. Trees in forest CH 4 budgets 44 VI. Conclusions 46 Acknowledgements 48 Author contributions 48 References 48 Summary Forest ecosystem methane ( CH 4 ) research has focused on soils, but trees are also important sources and sinks in forest CH 4 budgets. Living and dead trees transport and emit CH 4 produced in soils; living trees and dead wood emit CH 4 produced inside trees by microorganisms; and trees produce CH 4 through an abiotic photochemical process. Here, we review the state of the science on the production, consumption, transport, and emission of CH 4 by living and dead trees, and the spatial and temporal dynamics of these processes across hydrologic gradients inclusive of wetland and upland ecosystems. Emerging research demonstrates that tree CH 4 emissions can significantly increase the source strength of wetland forests, and modestly decrease the sink strength of upland forests. Scaling from stem or leaf measurements to trees or forests is limited by knowledge of the mechanisms by which trees transport soil‐produced CH 4 , microbial processes produce and oxidize CH 4 inside trees, a lack of mechanistic models, the diffuse nature of forest CH 4 fluxes, complex overlap between sources and sinks, and extreme variation across individuals. Understanding the complex processes that regulate CH 4 source–sink dynamics in trees and forests requires cross‐disciplinary research and new conceptual models that transcend the traditional binary classification of wetland vs upland forest.

Research Organization:
Smithsonian Institute, Washington, DC (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0008165
OSTI ID:
1611021
Alternate ID(s):
OSTI ID: 1490554
Journal Information:
New Phytologist, Vol. 222, Issue 1; ISSN 0028-646X
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 118 works
Citation information provided by
Web of Science

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Are methane emissions from mangrove stems a cryptic carbon loss pathway? Insights from a catastrophic forest mortality journal June 2019
Methane emissions from tree stems in neotropical peatlands journal October 2019
Radon as a natural tracer of gas transport through trees journal November 2019
Technical note: Interferences of volatile organic compounds (VOCs) on methane concentration measurements journal January 2019
Interacting effects of vegetation components and water level on methane dynamics in a boreal fen journal January 2020
Reviews and syntheses: Greenhouse gas exchange data from drained organic forest soils – a review of current approaches and recommendations for future research journal January 2019
Short-term flooding increases CH4 and N2O emissions from trees in a riparian forest soil-stem continuum journal February 2020