Hydrometeorological sensitivities of net ecosystem carbon dioxide and methane exchange of an Amazonian palm swamp peatland

Griffis, Tim J.; Roman, D. T.; Wood, J. D.; Deventer, J.; Fachin, L.; Rengifo, J.; Del Castillo, D.; Lilleskov, E.; Kolka, R.; Chimner, R. A.; del Aguila-Pasquel, J.; Wayson, C.; Hergoualc'h, K.; Baker, J. M.; Cadillo-Quiroz, H.; Ricciuto, D. M.

doi:10.1016/j.agrformet.2020.108167

Title: Hydrometeorological sensitivities of net ecosystem carbon dioxide and methane exchange of an Amazonian palm swamp peatland

Journal Article · Fri Sep 11 00:00:00 EDT 2020 · Agricultural and Forest Meteorology

DOI:https://doi.org/10.1016/j.agrformet.2020.108167· OSTI ID:1663238

^[1]; Roman, D. T. ^[2];

^[3];

^[4]; Fachin, L. ^[5];

^[5]; Del Castillo, D. ^[5];

^[6]; Kolka, R. ^[2];

^[7]; del Aguila-Pasquel, J. ^[5];

^[8];

^[9];

^[10]; Cadillo-Quiroz, H. ^[11]; Ricciuto, D. M. ^[12]

University of Minnesota, Saint Paul, MN (United States)
USDA Forest Service – Northern Research Station Grand Rapids, MN (United States)
University of Missouri, Columbia, MO (United States)
University of Minnesota, Saint Paul, MN (United States); University of Goettingen (Germany)
Instituto de Investigaciones de la Amazonia Peruana, Iquitos (Peru)
USDA Forest Service, Houghton, MI (United States)
Michigan Technological University, Houghton, MI (United States)
USDA Forest Service, Washington, DC (United States)
Center for International Forest Research, Situgede (Indonesia)
USDA-ARS and University of Minnesota, Saint Paul, MN (United States)
Arizona State University, Tempe, AZ (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Here, we report ecosystem-scale CO₂ and CH₄ flux observations for an Amazonian palm swamp peatland over a two-year period in relation to hydrometeorological forcings. Seasonal and short-term variations in hydrometeorological forcing had a strong effect on carbon dioxide and methane fluxes. High air temperature and vapor pressure deficit exerted an important limitation on photosynthesis during the dry season, while latent heat flux appeared to be insensitive to these climate drivers. Evidence from light-response analyses and flux partitioning support that photosynthetic activity was downregulated during dry conditions, while ecosystem respiration was either inhibited or enhanced depending on water table position. The cumulative net ecosystem carbon dioxide exchange indicated that the peatland was a significant carbon dioxide sink ranging from –465 (–279 to –651) g C m^-2 y^-1 in 2018 to –462 (–277 to –647) g C m^-2 y^-1 in 2019. The forest was a methane source of 22 (20 to 24) g C m^-2 y^-1, similar in magnitude to other tropical peatlands and larger than boreal and arctic peatlands. Furthermore, the annual carbon budget of this Amazonian palm swamp peatland appears to be a major carbon sink under current hydrometeorological conditions, but evidence indicates that the sink strength is vulnerable to future climate change.

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Research Organization:: Univ. of Minnesota, Minneapolis, MN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: SC0020167; AC05‐00OR22725; AC05-00OR22725

OSTI ID:: 1663238

Alternate ID(s):: OSTI ID: 1776489; OSTI ID: 1818676

Journal Information:: Agricultural and Forest Meteorology, Vol. 295; ISSN 0168-1923

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Hydrometeorological sensitivities of net ecosystem carbon dioxide and methane exchange of an Amazonian palm swamp peatland

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