Dissolved organic carbon manipulation reveals coupled cycling of carbon, nitrogen, and phosphorus in a nitrogen-rich stream
Description
Laura Johnson was a contributing author, before starting her career at NCWQR.
ABSTRACT
To investigate the coupling between carbon (C) and phosphorus (P) cycling in a human-altered stream, we conducted a whole-ecosystem manipulation of the labile dissolved organic carbon (DOC) pool in a nitrate (NO3-)-rich stream in the midwestern United States. For 6 d, we increased stream DOC by ~1 mg L-1 through a continuous addition of sodium acetate. On the sixth day of the addition, ammonium (NH4+) was increased by ~130 µg N L-1 to examine the potential for nitrogen (N) to mediate coupled C and P cycling. Of the added DOC, 85% was retained within the treatment reach, which increased ecosystem respiration with respect to the reference reach. Alkaline phosphatase activity (APA) increased from day 1 to day 6; however, water column P uptake only increased on day 6 concurrent with the NH4+ addition. Gross primary production decreased during the DOC addition relative to the reference reach, yet seemed to recover on day 6 (NH4+ addition). These results suggest that during the DOC addition, heterotrophs out competed autotrophs for N and that sediment-sorbed P sustained the heterotrophic community while P uptake from the water column was dominated by autotrophs. Because APA and P uptake were stimulated by the simultaneous DOC and NH4+ addition, P cycling appeared to be N limited, despite the high ambient NO3- concentration; this indicates a strong preferential uptake of NH4+
over NO3-. In streams, C and P cycling can be intrinsically coupled through biological mechanisms, and this coupling can be mediated by the availability of different forms of inorganic N.
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