Journal
ECOSYSTEMS
Volume 18, Issue 8, Pages 1319-1331Publisher
SPRINGER
DOI: 10.1007/s10021-015-9902-9
Keywords
Nitrogen cycling; Urban systems; Watershed; Total maximum daily load
Categories
Funding
- U.S. National Science Foundation: NSF-EAR award [0847838]
- U.S. National Science Foundation: NSF-DEB award [1027188]
- Directorate For Geosciences
- Division Of Earth Sciences [0847838] Funding Source: National Science Foundation
- Division Of Environmental Biology
- Direct For Biological Sciences [1027188] Funding Source: National Science Foundation
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1058162] Funding Source: National Science Foundation
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1058502] Funding Source: National Science Foundation
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We calculated watershed nitrogen (N) retention (inputs-outputs)/inputs) each year from 1999-2013 for nine sub-watersheds along an urban-rural gradient near Baltimore MD to determine how land use and climate influence watershed N flux. Retention is critical to efforts to control coastal eutrophication through regulatory efforts that mandate reductions in the total maximum daily load (TMDL) of N that specific water bodies can receive. Retention decreased with urbanization as well as with increases in precipitation with retention decreasing from an average of 91% in the forested sub-watershed to 16% in the most urban sub-watershed. Export was 23% higher, and retention was 7% lower in winter (November-April) than during the growing season. Total N delivery to Baltimore Harbor varied almost threefold between wet and dry years, which is significant relative to the total annual export allowed for all non-point sources to the harbor under the TMDL. These results suggest that expectations for TMDLs should consider watershed land use and climate variability, and their potential for change if they are to result in improvements in receiving water quality.
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