Skip to Main Content
Due to a lapse in federal funding, this USDA website will not be actively updated. Once funding has been reestablished, online operations will continue.
Hydrology and microtopography control carbon dynamics in wetlands: Implications in partitioning ecosystem respiration in a coastal plain forested wetlandAuthor(s): Guofang Miao; Asko Noormets; Jean-Christophe Domec; Montserrat Fuentes; Carl C. Trettin; Ge Sun; Steve G. McNulty; John S. King
Source: Agricultural and Forest Meteorology
Publication Series: Scientific Journal (JRNL)
Station: Southern Research Station
View PDF (1.0 MB)
DescriptionWetlands store a disproportionately large fraction of organic carbon relative to their areal coverage, and thus play an important role in global climate mitigation. As destabilization of these stores through land use or en- vironmental change represents a signi fi cant climate feedback, it is important to understand the functional regulation of respiratory processes that catabolize them. In this study, we established an eddy covariance fl ux tower project in a coastal plain forested wetland in North Carolina, USA, and measured total ecosystem re- spiration (R e ) over three years (2009 – 2011). We evaluated the magnitude and variability of three respiration components – belowground (R s ), coarse woody debris (R CWD ), and aboveground plant (R agp ) respiration at the ecosystem scale, by accounting microtopographic variation for upscaling and constraining the mass balance with R e . Strong hydrologic control was detected for R s and R CWD , whereas R agp and R e were relatively insensitive to water table fl uctuations. In a relatively dry year (2010), this forested wetland respired a total of about 2000 g CO 2 -C m -2 y -1 annually, 51% as Rs, 37% as R agp , and 12% as R CWD . During non- fl ooded periods R s contributed up to 57% of R e and during fl ooded periods R agp contributed up to 69%. The contribution of R s to R e increased by 2.4% for every cm of decrease in water level at intermediate water table level, and was nearly constant when fl ooded or when the water level more than 15 cm below ground. The contrasting sensitivity of di ff erent re- spiration components highlights the need for explicit consideration of this dynamic in ecosystem and Earth System Models.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationMiao, Guofang; Noormets, Asko; Domec, Jean-Christophe; Fuentes, Montserrat; Trettin, Carl C.; Sun, Ge; McNulty, Steve G.; King, John S. 2017.Hydrology and microtopography control carbon dynamics in wetlands: Implications in partitioning ecosystem respiration in a coastal plain forested wetland. Agricultural and Forest Meteorology. 247: 343-355. 13 p. https://doi.org/10.1016/j.agrformet.2017.08.022.
KeywordsForested wetland, Hydrology, Microtopography, Respiration, Eddy covariance, fl Forested wetland
- Effects of soil moisture and water depth on ERS SAR backscatter measurements from an Alaskan wetland complex
- Analyzing the ecosystem carbon and hydrologic characteristics of forested wetland using a biogeochemical process model
- Linkage of mike she to wetland-dndc for carbon budgeting and anaerobic biogeochemistry simulation
XML: View XML