Abstract
AbstractDissolved organic C (DOC) is metabolically important in streams, but its contribution to ecosystem metabolism is not well known because it is a complex mixture of mostly unidentified molecules. The uptake of bioavailable DOC in White Clay Creek (WCC), a 3rd-order stream in Pennsylvania, was estimated from the results of an experiment using 13C-labeled tree-tissue leachate and streambed sediments in recirculating mesocosms. The contribution of DOC in transport to stream metabolism was estimated from measurements of 13C-DOC uptake, 12C-DOC concentrations, and diel changes in dissolved O2 in the mesocosms. Eighty percent (±5) of the DOC in the 13C-tree-tissue leachate was bioavailable and belonged to 1 of 2 distinct lability classes, readily and intermediately labile. These components made up 88% (±0.6) and 12% (±0.6), respectively, of the biodegradable DOC in the leachate. Uptake mass transfer coefficients for the readily and intermediately labile components were 55 (±24) μm/s and 2.6 (±0.13) μm/s, ...
Published Version
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