Tags

Type your tag names separated by a space and hit enter

Radiative forcing of methane fluxes offsets net carbon dioxide uptake for a tropical flooded forest.
Glob Chang Biol 2019; 25(6):1967-1981GC

Abstract

Wetlands are important sources of methane (CH4) and sinks of carbon dioxide (CO2). However, little is known about CH4 and CO2 fluxes and dynamics of seasonally flooded tropical forests of South America in relation to local carbon (C) balances and atmospheric exchange. We measured net ecosystem fluxes of CH4 and CO2 in the Pantanal over 2014-2017 using tower-based eddy covariance along with C measurements in soil, biomass and water. Our data indicate that seasonally flooded tropical forests are potentially large sinks for CO2 but strong sources of CH4 , particularly during inundation when reducing conditions in soils increase CH4 production and limit CO2 release. During inundation when soils were anaerobic, the flooded forest emitted 0.11 ± 0.002 g CH4 -C m-2 d-1 and absorbed 1.6 ± 0.2 g CO2 -C m-2 d-1 (mean ± 95% confidence interval for the entire study period). Following the recession of floodwaters, soils rapidly became aerobic and CH4 emissions decreased significantly (0.002 ± 0.001 g CH4 -C m-2 d-1) but remained a net source, while the net CO2 flux flipped from being a net sink during anaerobic periods to acting as a source during aerobic periods. CH4 fluxes were 50 times higher in the wet season; DOC was a minor component in the net ecosystem carbon balance. Daily fluxes of CO2 and CH4 were similar in all years for each season, but annual net fluxes varied primarily in relation to flood duration. While the ecosystem was a net C sink on an annual basis (absorbing 218 g C m-2 (as CH4 -C + CO2 -C) in anaerobic phases and emitting 76 g C m-2 in aerobic phases), high CH4 effluxes during the anaerobic flooded phase and modest CH4 effluxes during the aerobic phase indicate that seasonally flooded tropical forests can be a net source of radiative forcings on an annual basis, thus acting as an amplifying feedback on global warming.

Authors+Show Affiliations

Programa de Pós-Graduação em Ciências Ambiental, Universidade de Cuiabá (UNIC), Cuiabá, Brazil.Programa de Pós-Graduação em Física Ambiental, Universidade Federal de Mato Grosso (UFMT), Cuiabá, Brazil.Biological Sciences Department, California State University, San Marcos (CSUSM), California.Stockholm Environment Institute (SEI), Stockholm, Sweden.Programa de Pós-Graduação em Física Ambiental, Universidade Federal de Mato Grosso (UFMT), Cuiabá, Brazil.Departamento de Solos e Engenharia Rural, Universidade Federal de Mato Grosso (UFMT), Cuiabá, Brazil.Institute for Resources, Environment and Sustainability, University of British Columbia (UBC), Vancouver, British Columbia, Canada. Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia (UBC), Vancouver, British Columbia, Canada.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

30854765

Citation

Dalmagro, Higo J., et al. "Radiative Forcing of Methane Fluxes Offsets Net Carbon Dioxide Uptake for a Tropical Flooded Forest." Global Change Biology, vol. 25, no. 6, 2019, pp. 1967-1981.
Dalmagro HJ, Zanella de Arruda PH, Vourlitis GL, et al. Radiative forcing of methane fluxes offsets net carbon dioxide uptake for a tropical flooded forest. Glob Chang Biol. 2019;25(6):1967-1981.
Dalmagro, H. J., Zanella de Arruda, P. H., Vourlitis, G. L., Lathuillière, M. J., de S Nogueira, J., Couto, E. G., & Johnson, M. S. (2019). Radiative forcing of methane fluxes offsets net carbon dioxide uptake for a tropical flooded forest. Global Change Biology, 25(6), pp. 1967-1981. doi:10.1111/gcb.14615.
Dalmagro HJ, et al. Radiative Forcing of Methane Fluxes Offsets Net Carbon Dioxide Uptake for a Tropical Flooded Forest. Glob Chang Biol. 2019;25(6):1967-1981. PubMed PMID: 30854765.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Radiative forcing of methane fluxes offsets net carbon dioxide uptake for a tropical flooded forest. AU - Dalmagro,Higo J, AU - Zanella de Arruda,Paulo H, AU - Vourlitis,George L, AU - Lathuillière,Michael J, AU - de S Nogueira,José, AU - Couto,Eduardo G, AU - Johnson,Mark S, Y1 - 2019/04/11/ PY - 2018/10/21/received PY - 2019/01/13/revised PY - 2019/02/23/accepted PY - 2019/3/12/pubmed PY - 2019/3/12/medline PY - 2019/3/12/entrez KW - CH4 and CO2 fluxes KW - Eddy-covariance KW - global change KW - greenhouse gas balance KW - hyperseasonal savanna KW - net ecosystem carbon balance KW - tropical wetlands SP - 1967 EP - 1981 JF - Global change biology JO - Glob Chang Biol VL - 25 IS - 6 N2 - Wetlands are important sources of methane (CH4) and sinks of carbon dioxide (CO2). However, little is known about CH4 and CO2 fluxes and dynamics of seasonally flooded tropical forests of South America in relation to local carbon (C) balances and atmospheric exchange. We measured net ecosystem fluxes of CH4 and CO2 in the Pantanal over 2014-2017 using tower-based eddy covariance along with C measurements in soil, biomass and water. Our data indicate that seasonally flooded tropical forests are potentially large sinks for CO2 but strong sources of CH4 , particularly during inundation when reducing conditions in soils increase CH4 production and limit CO2 release. During inundation when soils were anaerobic, the flooded forest emitted 0.11 ± 0.002 g CH4 -C m-2 d-1 and absorbed 1.6 ± 0.2 g CO2 -C m-2 d-1 (mean ± 95% confidence interval for the entire study period). Following the recession of floodwaters, soils rapidly became aerobic and CH4 emissions decreased significantly (0.002 ± 0.001 g CH4 -C m-2 d-1) but remained a net source, while the net CO2 flux flipped from being a net sink during anaerobic periods to acting as a source during aerobic periods. CH4 fluxes were 50 times higher in the wet season; DOC was a minor component in the net ecosystem carbon balance. Daily fluxes of CO2 and CH4 were similar in all years for each season, but annual net fluxes varied primarily in relation to flood duration. While the ecosystem was a net C sink on an annual basis (absorbing 218 g C m-2 (as CH4 -C + CO2 -C) in anaerobic phases and emitting 76 g C m-2 in aerobic phases), high CH4 effluxes during the anaerobic flooded phase and modest CH4 effluxes during the aerobic phase indicate that seasonally flooded tropical forests can be a net source of radiative forcings on an annual basis, thus acting as an amplifying feedback on global warming. SN - 1365-2486 UR - https://www.unboundmedicine.com/medline/citation/30854765/Radiative_forcing_of_methane_fluxes_offsets_net_carbon_dioxide_uptake_for_a_tropical_flooded_forest_ L2 - https://doi.org/10.1111/gcb.14615 DB - PRIME DP - Unbound Medicine ER -