{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,25]],"date-time":"2026-04-25T08:05:36Z","timestamp":1777104336711,"version":"3.51.4"},"reference-count":37,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2006,7,1]],"date-time":"2006-07-01T00:00:00Z","timestamp":1151712000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"name":"USEPA Science to Achieve Results (STAR) Nutrient Science for Improved Watershed Management","award":["R83-0652"],"award-info":[{"award-number":["R83-0652"]}]}],"content-domain":{"domain":["acsess.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["J of Env Quality"],"published-print":{"date-parts":[[2006,7]]},"abstract":"<jats:title>ABSTRACT<\/jats:title><jats:p>Streams alter the concentration of nutrients they transport and thereby influence nutrient loading to estuaries downstream; however, the relationship between in\u2010stream uptake, discharge variability, and subsequent nutrient export is poorly understood. In this study, in\u2010stream N and P uptake were examined in the stream network draining a row\u2010crop agricultural operation in coastal North Carolina. The effect of in\u2010stream nutrient uptake on estuarine loading was examined using continuous measurements of watershed nutrient export. From August to December 2003, 52 and 83% of the NH<jats:sub>4<\/jats:sub><jats:sup>+<\/jats:sup> and PO<jats:sub>4<\/jats:sub><jats:sup>3\u2212<\/jats:sup> loads were exported during storms while concurrent storm flow volume was 34% of the total. Whole\u2010ecosystem mass transfer velocities (<jats:italic>V<\/jats:italic><jats:sub><jats:italic>f<\/jats:italic><\/jats:sub>) of NH<jats:sub>4<\/jats:sub><jats:sup>+<\/jats:sup> and PO<jats:sub>4<\/jats:sub><jats:sup>3\u2212<\/jats:sup>, measured using short\u2010term additions of inorganic nutrients, ranged from 0.1 to 25 mm min<jats:sup>\u22121<\/jats:sup> Using a mass balance approach, this in\u2010stream uptake was found to attenuate 65 to 98% of the NH<jats:sub>4<\/jats:sub><jats:sup>+<\/jats:sup> flux and 78 to 98% of the PO<jats:sub>4<\/jats:sub><jats:sup>3\u2212<\/jats:sup> flux in small, first\u2010order drainage ditches. For the larger channel downstream, an empirical model based on <jats:italic>V<\/jats:italic><jats:sub><jats:italic>f<\/jats:italic><\/jats:sub> and discharge was developed to estimate the percentage of the nutrient load retained in\u2010stream. The model predicted that all of the upstream NH<jats:sub>4<\/jats:sub><jats:sup>+<\/jats:sup> and PO<jats:sub>4<\/jats:sub><jats:sup>3\u2212<\/jats:sup> load was retained during base flow, while 65 and 37% of the NH<jats:sub>4<\/jats:sub><jats:sup>+<\/jats:sup> and PO<jats:sub>4<\/jats:sub><jats:sup>3\u2212<\/jats:sup> load was retained during storms. Remineralization from the streambed (vs. terrestrial sources) was the apparent source of NH<jats:sub>4<\/jats:sub><jats:sup>+<\/jats:sup> and PO<jats:sub>4<\/jats:sub><jats:sup>3\u2212<\/jats:sup> to the estuary during base flow. In\u2010stream uptake reduced the dissolved inorganic N to dissolved inorganic P ratio of water exported to the N\u2010limited estuary, thus limiting the potential for estuarine phytoplankton growth.<\/jats:p>","DOI":"10.2134\/jeq2005.0341","type":"journal-article","created":{"date-parts":[[2006,7,6]],"date-time":"2006-07-06T20:34:31Z","timestamp":1152218071000},"page":"1237-1247","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":39,"title":["Nitrogen and Phosphorus Attenuation within the Stream Network of a Coastal, Agricultural Watershed"],"prefix":"10.1002","volume":"35","author":[{"given":"Scott H.","family":"Ensign","sequence":"first","affiliation":[{"name":"Institute of Marine Sciences University of North Carolina at Chapel Hill 3431 Arendell Street Morehead City NC 28557"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sara K.","family":"McMillan","sequence":"additional","affiliation":[{"name":"Institute of Marine Sciences University of North Carolina at Chapel Hill 3431 Arendell Street Morehead City NC 28557"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Suzanne P.","family":"Thompson","sequence":"additional","affiliation":[{"name":"Institute of Marine Sciences University of North Carolina at Chapel Hill 3431 Arendell Street Morehead City NC 28557"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Michael F.","family":"Piehler","sequence":"additional","affiliation":[{"name":"Institute of Marine Sciences University of North Carolina at Chapel Hill 3431 Arendell Street Morehead City NC 28557"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2006,7]]},"reference":[{"key":"e_1_2_8_2_1","volume-title":"Lumped parameter models for predicting nitrogen loading from lower Coastal Plain watersheds","author":"Amatya D.M.","year":"2003"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1023\/A:1003735225869"},{"key":"e_1_2_8_4_1","unstructured":"Birgand F.2000.Quantification and modeling of in\u2010stream processes in agricultural canals of the lower Coastal Plain. 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