Abstract
The export of dissolved organic carbon (DOC) from a sandy substrate Spartina alterniflora marsh in North Carolina was studied from August 1982 to July 1983. DOC of the pore water was determined using a total organic carbon analyzer and was reliably estimated by measuring the absorbance of the pore water. DOC ranged between 1 and 6 mg l −1 and was highest during summer and lowest in winter. Based on hydraulic conductivity calculations, over 34 000 1 year −1 of pore water was exported through the 1×25 m transect perpendicular to a tidal creek. Most of this flux (over 90%) occurred within 2 m of the creek bank. Based on this pore water flux, belowground DOC export was only 1·52 g Cm −2 year −1.
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