Water and organic carbon fluxes from an irregularly flooded brackish marsh on the upper Texas Coast, U.S.A.

dc.acquisition-srcen_US
dc.call-noen_US
dc.contract-noen_US
dc.contributor.authorBorey, R.B.en_US
dc.contributor.authorHarcombe, P.A.en_US
dc.contributor.authorFisher, F.M.en_US
dc.contributor.otherEstuarine, Coastal and Shelf Scienceen_US
dc.date.accessioned2010-02-15T16:52:24Z
dc.date.available2010-02-15T16:52:24Z
dc.date.issued1983en_US
dc.degreeen_US
dc.descriptionp. 379-402.en_US
dc.description-otheren_US
dc.description.abstractWater flows, concentrations of total(TOC), dissolved(DOC), and particulate(POC) organic carbon and seston were monitored for 52 diel periods in the single creek draining a 270 ha Spartina patens-Distichlis spicata marsh on the upper Texas coast. Rainfall, creek water flows, and water levels in the creek and on the marsh were measured by recording instruments. Rainfall accounted for most marsh flooding, and water outflow was significantly correlated with both rainfall and marsh water level. Creek flows were predominantly outward because microtopographic features and dense vegetation restricted overmarsh water flows and thereby reduced tidal flooding while extending the time of precipitation runoff. Concentrations of organic carbon in water leaving the marsh were highest in spring and summer and averaged 25.62, 21.41, and 3.35 mg 1^-1 of TOC, DOC, and POC, respectively. These were 9.34, 9.93, and 0.04 mg 1^-1, respectively, higher than bay water. Most POC was 0.3-28 micrometers in diameter. Seston >28 microns leaving the marsh was 95% amorphous material; the rest was plankton, grass particles, and fecal pellets. Loss of organic carbon was directly correlated with net water flux, and thus rainfall accounted for most carbon loss. Net carbon loss averaged 196kg TOC, 150 kg DOC, and 32 kg of POC per day. Net annual loss was 2.4-5.5% of net aerial primary productivity (NAPP), or 21.55-30.09 g TOC m^-2 year^-1. Export from this marsh falls within the range found for other marshes and the data collectively indicate that coastal marshes are not losing as much organic carbon as has been suggested by indirect measurements. The discrepancy between potential and realized export is explained by the fact that export is not a simple removal of excess detritus by tidal action but is a more complicated process mediated by the interaction of additional factors such as rainfall, vegetation structure, microtopographic varition and decomposition, which can serve to reduce the amount and quality of NAPP exported.en_US
dc.description.urihttp://gbic.tamug.edu/request.htmen_US
dc.geo-codeTexas coasten_US
dc.historyen_US
dc.identifier.urihttp://hdl.handle.net/1969.3/19545
dc.latitudeen_US
dc.locationTAMUG periodical collectionen_US
dc.longitudeen_US
dc.notesen_US
dc.placeen_US
dc.publisheren_US
dc.relation.ispartofseries1790.00en_US
dc.relation.urien_US
dc.scaleen_US
dc.seriesen_US
dc.subjectwater motionen_US
dc.subjectdissolved oxygen (DO)en_US
dc.subjectsuspended organic matteren_US
dc.subjectbrackish wateren_US
dc.subjectrunoffen_US
dc.subjectprimary productionen_US
dc.subjectbiological productionen_US
dc.titleWater and organic carbon fluxes from an irregularly flooded brackish marsh on the upper Texas Coast, U.S.A.en_US
dc.typeArticleen_US
dc.universityen_US
dc.vol-issue16en_US
Files