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Variation of energy and carbon fluxes from a restored temperate freshwater wetland and implications for carbon market verification protocols
Author(s) -
Anderson Frank E.,
Bergamaschi Brian,
Sturtevant Cove,
Knox Sara,
Hastings Lauren,
WindhamMyers Lisamarie,
Detto Matteo,
Hestir Erin L.,
Drexler Judith,
Miller Robin L.,
Matthes Jaclyn Hatala,
Verfaillie Joseph,
Baldocchi Dennis,
Snyder Richard L.,
Fujii Roger
Publication year - 2016
Publication title -
journal of geophysical research: biogeosciences
Language(s) - English
Resource type - Journals
eISSN - 2169-8961
pISSN - 2169-8953
DOI - 10.1002/2015jg003083
Subject(s) - eddy covariance , environmental science , wetland , ecosystem , temperate climate , growing season , atmospheric sciences , carbon cycle , biomass (ecology) , greenhouse gas , biogeochemical cycle , carbon sequestration , carbon sink , productivity , terrestrial ecosystem , carbon dioxide , primary production , flux (metallurgy) , hydrology (agriculture) , ecology , chemistry , biology , geotechnical engineering , engineering , geology , macroeconomics , organic chemistry , economics
Temperate freshwater wetlands are among the most productive terrestrial ecosystems, stimulating interest in using restored wetlands as biological carbon sequestration projects for greenhouse gas reduction programs. In this study, we used the eddy covariance technique to measure surface energy carbon fluxes from a constructed, impounded freshwater wetland during two annual periods that were 8 years apart: 2002–2003 and 2010–2011. During 2010–2011, we measured methane (CH 4 ) fluxes to quantify the annual atmospheric carbon mass balance and its concomitant influence on global warming potential (GWP). Peak growing season fluxes of latent heat and carbon dioxide (CO 2 ) were greater in 2002–2003 compared to 2010–2011. In 2002, the daily net ecosystem exchange reached as low as −10.6 g C m −2 d −1 , which was greater than 3 times the magnitude observed in 2010 (−2.9 g C m −2 d −1 ). CH 4 fluxes during 2010–2011 were positive throughout the year and followed a strong seasonal pattern, ranging from 38.1 mg C m −2 d −1 in the winter to 375.9 mg C m −2 d −1 during the summer. The results of this study suggest that the wetland had reduced gross ecosystem productivity in 2010–2011, likely due to the increase in dead plant biomass (standing litter) that inhibited the generation of new vegetation growth. In 2010–2011, there was a net positive GWP (675.3 g C m −2 yr −1 ), and when these values are evaluated as a sustained flux, the wetland will not reach radiative balance even after 500 years.