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Static chamber fluxes of carbon dioxide and methane from Phragmites wetlands and supporting data collected across a salinity gradient on Cape Cod, Massachusetts


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Sanders-DeMott, R., Eagle, M.J., Kroeger, K.D., Wang, F., Brooks, T.W., O'Keefe Suttles, J.A., Nick, S.K., Mann, A.G., and Tang, J. 2022, Carbon dioxide and methane fluxes with supporting environmental data from coastal wetlands across Cape Cod, Massachusetts (ver 2.0, June 2022): U.S. Geological Survey data release,


Saline tidal wetlands are important sites of carbon sequestration and produce negligible methane (CH4) emissions due to regular inundation with sulfate-rich seawater. Yet, widespread management of coastal hydrology has restricted vast areas of coastal wetlands to tidal exchange. These ecosystems often undergo impoundment and freshening, which in turn cause vegetation shifts like invasion by Phragmites, that affect ecosystem carbon balance. Understanding controls of carbon exchange in these understudied ecosystems is critical for informing climate consequences of blue carbon restoration and/or management interventions. Here we present measurements of net ecosystem exchange of carbon dioxide (CO2) and methane, along with ancillary meteorological [...]


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“Data on methane and carbon dioxide fluxes.”
20.75 KB text/csv
“Data on phragmites biomass.”
4.81 KB text/csv
“Meteorological data.”
1.63 MB text/csv
“Photo of a chamber sampling platform in a Phragmites wetland, Sage Lot Pond, MA.”
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“Data on soil and air temperature.”
14.22 MB text/csv


Measurements of carbon dioxide and methane fluxes from static chambers were collected to assess carbon exchange at four coastal Phragmites wetland sites across a salinity gradient(4 to 25 psu) in impounded and natural, tidally unrestricted Phragmites wetlands at the Herring River in Wellfleet, MA, USA and at Sage Lot Pond in Falmouth, MA from July through November 2020. Environmental and biologic metrics that could inform carbon exchange, including biomass, air and soil temperature, relative humidity, and photosynthetically active radiation were also collected to support data interpretation. This dataset can help evaluate the effect of salinity on carbon dioxide and methane exchange in coastal wetlands. Data were collected to inform predictive models of carbon fluxes across coastal wetlands of varying salinity and to facilitate National Park Service restoration planning and future blue carbon project assessments.

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