DSpace Repository

Global change accelerates carbon assimilation by a wetland ecosystem engineer

Show simple item record

dc.contributor.author Caplan, Joshua S. en
dc.contributor.author Hager, Rachel N. en
dc.contributor.author Megonigal, J. Patrick en
dc.contributor.author Mozdzer, Thomas J. en
dc.date.accessioned 2016-01-11T16:25:33Z
dc.date.available 2016-01-11T16:25:33Z
dc.date.issued 2015
dc.identifier.citation Caplan, Joshua S., Hager, Rachel N., Megonigal, J. Patrick, and Mozdzer, Thomas J. 2015. "<a href="https%3A%2F%2Frepository.si.edu%2Fhandle%2F10088%2F27852">Global change accelerates carbon assimilation by a wetland ecosystem engineer</a>." <em>Environmental Research Letters</em>. 10 (11):115006. <a href="https://doi.org/10.1088/1748-9326/10/11/115006">https://doi.org/10.1088/1748-9326/10/11/115006</a> en
dc.identifier.issn 1748-9326
dc.identifier.uri http://hdl.handle.net/10088/27852
dc.description.abstract The primary productivity of coastal wetlands is changing dramatically in response to rising atmospheric carbon dioxide (CO 2 ) concentrations, nitrogen (N) enrichment, and invasions by novel species, potentially altering their ecosystem services and resilience to sea level rise. In order to determine how these interacting global change factors will affect coastal wetland productivity, we quantified growing-season carbon assimilation (?gross primary productivity, or GPP) and carbon retained in living plant biomass (?net primary productivity, or NPP) of North American mid-Atlantic saltmarshes invaded by Phragmites australis (common reed) under four treatment conditions: two levels of CO 2 (ambient and +300 ppm) crossed with two levels of N (0 and 25 g N added m -2 yr -1 ). For GPP, we combined descriptions of canopy structure and leaf-level photosynthesis in a simulation model, using empirical data from an open-top chamber field study. Under ambient CO 2 and low N loading (i.e., the Control), we determined GPP to be 1.66 ± 0.05 kg C m -2 yr -1 at a typical Phragmites stand density. Individually, elevated CO 2 and N enrichment increased GPP by 44 and 60%, respectively. Changes under N enrichment came largely from stimulation to carbon assimilation early and late in the growing season, while changes from CO 2 came from stimulation during the early and mid-growing season. In combination, elevated CO 2 and N enrichment increased GPP by 95% over the Control, yielding 3.24 ± 0.08 kg C m -2 yr -1 . We used biomass data to calculate NPP, and determined that it represented 44%-60% of GPP, with global change conditions decreasing carbon retention compared to the Control. Our results indicate that Phragmites invasions in eutrophied saltmarshes are driven, in part, by extended phenology yielding 3.1× greater NPP than native marsh. Further, we can expect elevated CO 2 to amplify Phragmites productivity throughout the growing season, with potential implications including accelerated spread and greater carbon storage belowground. en
dc.relation.ispartof Environmental Research Letters en
dc.title Global change accelerates carbon assimilation by a wetland ecosystem engineer en
dc.type Journal Article en
dc.identifier.srbnumber 138347
dc.identifier.doi 10.1088/1748-9326/10/11/115006
rft.jtitle Environmental Research Letters
rft.volume 10
rft.issue 11
rft.spage 115006
dc.description.SIUnit SERC en
dc.description.SIUnit Peer-reviewed en
dc.citation.spage 115006

Files in this item

This item appears in the following Collection(s)

Show simple item record

Search DSpace


My Account