Long-term dynamics of soil, tree stem and ecosystem methane fluxes in a riparian forest

Mander, Ülo; Krasnova, Alisa; Schindler, Thomas; Megonigal, J. Patrick; Escuer-Gatius, Jordi; Espenberg, Mikk; Machacova, Katerina; Maddison, Martin; Pärn, Jaan; Ranniku, Reti; Pihlatie, Mari; Kasak, Kuno; Niinemets, Ülo; Soosaar, Kaido

doi:10.1016/j.scitotenv.2021.151723

Title: Long-term dynamics of soil, tree stem and ecosystem methane fluxes in a riparian forest

Journal Article · Thu Nov 18 00:00:00 EST 2021 · Science of the Total Environment

DOI:https://doi.org/10.1016/j.scitotenv.2021.151723· OSTI ID:1977627

Mander, Ülo ^[1]; Krasnova, Alisa ^[2]; Schindler, Thomas ^[1]; Megonigal, J. Patrick ^[3]; Escuer-Gatius, Jordi ^[4]; Espenberg, Mikk ^[5]; Machacova, Katerina ^[1]; Maddison, Martin ^[5]; Pärn, Jaan ^[5]; Ranniku, Reti ^[5]; Pihlatie, Mari ^[6]; Kasak, Kuno ^[5]; Niinemets, Ülo ^[4]; Soosaar, Kaido ^[1]

University of Tartu (Estonia); Czech Academy of Sciences (CAS), Prague (Czech Republic)
University of Tartu (Estonia); Estonian University of Life Sciences (Estonia)
Smithsonian Environmental Institute, Edgewater, MD (United States)
Estonian University of Life Sciences (Estonia)
University of Tartu (Estonia)
Univ. of Helsinki (Finland)

The carbon (C) budgets of riparian forests are sensitive to climatic variability. Therefore, riparian forests are hot spots of C cycling in landscapes. Only a limited number of studies on continuous measurements of methane (CH₄) fluxes from riparian forests is available. Here, in this work, we report continuous high-frequency soil and ecosystem (eddy-covariance; EC) measurements of CH₄ fluxes with a quantum cascade laser absorption spectrometer for a 2.5-year period and measurements of CH₄ fluxes from tree stems using manual chambers for a 1.5 year period from a temperate riparian Alnus incana forest. The results demonstrate that the riparian forest is a minor net annual sink of CH₄ consuming 0.24 kg CH₄-C ha^–1 y^–1. Soil water content is the most important determinant of soil, stem, and EC fluxes, followed by soil temperature. There were significant differences in CH₄ fluxes between the wet and dry periods. During the wet period, 83% of CH₄ was emitted from the tree stems while the ecosystem-level emission was equal to the sum of soil and stem emissions. During the dry period, CH₄ was substantially consumed in the soil whereas stem emissions were very low. A significant difference between the EC fluxes and the sum of soil and stem fluxes during the dry period is most likely caused by emission from the canopy whereas at the ecosystem level the forest was a clear CH₄ sink. Our results together with past measurements of CH₄ fluxes in other riparian forests suggest that temperate riparian forests can be long-term CH₄ sinks.

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Research Organization:: Smithsonian Institute, Washington, DC (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0008165

OSTI ID:: 1977627

Alternate ID(s):: OSTI ID: 1839484

Journal Information:: Science of the Total Environment, Vol. 809; ISSN 0048-9697

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Long-term dynamics of soil, tree stem and ecosystem methane fluxes in a riparian forest

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