N budgets and aquatic uptake in the Ipswich River basin, northeastern Massachusetts
Hopkinson, Charles S.
Rastetter, Edward B.
Vallino, Joseph J.
MetadataShow full item record
We calculated N budgets and conducted nutrient uptake experiments to evaluate the fate of N in the aquatic environment of the Ipswich River basin, northeastern Massachusetts. A mass balance indicates that the basin retains about 50% of gross N inputs, mostly in terrestrial components of the landscape, and the loss and retention of total nitrogen (TN) in the aquatic environment was about 9% of stream loading. Uptake lengths of PO4 and NH4 were measurable in headwater streams, but NO3 uptake was below detection (minimum detection limit = 0.05 μM). Retention or loss of NO3 was observed in a main stem reach bordered by wetland habitat. Nitrate removal in urban headwater tributaries was because of water withdrawals and denitrification during hypoxic events and in ponded wetlands with long water residence times. A mass balance using an entire river network indicates that basin-wide losses due to aquatic denitrification are considerably lower than estimates from several recent studies and range from 4 to 16% of TDN in stream loading. Withdrawals for domestic use restrict the runoff of headwater catchments from reaching the main stem during low base flow periods, thereby contributing to the spatial and temporal regulation of N export from headwater tributaries.
Author Posting. © American Geophysical Union, 2004. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Water Resources Research 40 (2004): W11201, doi:10.1029/2004WR003172.
Showing items related by title, author, creator and subject.
Growth and specific P-uptake rates of bacterial and phytoplanktonic communities in the Southeast Pacific (BIOSOPE cruise) Duhamel, Solange; Moutin, T.; Van Wambeke, F.; Van Mooy, Benjamin A. S.; Rimmelin, P.; Raimbault, P.; Claustre, Hervé (Copernicus Publications on behalf of the European Geosciences Union, 2007-11-08)Predicting heterotrophic bacteria and phytoplankton specific growth rates (μ) is of great scientific interest. Many methods have been developed in order to assess bacterial or phytoplankton μ. One widely used method is to ...
Temperature and salinity effects on elemental uptake in the shells of larval and juvenile softshell clams Mya arenaria Strasser, Carly A.; Mullineaux, Lauren S.; Thorrold, Simon R. (Inter-Research, 2008-10-28)The chemical composition of biogenic carbonate has great potential to serve as a natural tag in studies of marine population connectivity. Yet the degree to which carbonate chemistry reflects ambient water composition may ...
Long, Matthew C.; Lindsay, Keith; Peacock, Synte; Moore, J. Keith; Doney, Scott C. (American Meteorological Society, 2013-09-15)Ocean carbon uptake and storage simulated by the Community Earth System Model, version 1–Biogeochemistry [CESM1(BGC)], is described and compared to observations. Fully coupled and ocean-ice configurations are examined; ...