HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Abstract Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Related articles in JEQ Similar articles in this journal Similar articles in ISI Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (30) Citing Articles via Google Scholar Google Scholar Articles by Royer, T. V. Articles by David, M. B. Search for Related Content PubMed PubMed Citation Articles by Royer, T. V. Articles by David, M. B. Agricola Articles by Royer, T. V. Articles by David, M. B. Related Collections Biogeochemical Processes Watershed and Landscape Processes Nutrient Cycling Nitrogen

Transport and Fate of Nitrate in Headwater Agricultural Streams in Illinois

^a Department of Natural Resources and Environmental Sciences, University of Illinois, 1102 South Goodwin Avenue, Urbana, IL 61801
^b Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556
^c Department of Biological Sciences, Kent State University, 256 Cunningham Hall, Kent, OH 44242

View larger version (23K): [in a new window]   Fig. 1. Conceptual diagram of nutrient spiraling (modified from Newbold, 1992). The stream consists of two compartments, the water column (W) and the benthic sediments (B). In this model, uptake (U) of NO3–N is due to denitrification, making the uptake length denitrification-specific.

View larger version (39K): [in a new window]   Fig. 2. Mean daily water temperature and stream NO3–N concentrations at selected sites from January 2001 through January 2002. All sites showed similar patterns in temperature and NO3–N, and therefore only selected sites are shown. (Site characteristics are given in Table 1.)

View larger version (21K): [in a new window]   Fig. 3. Mean (plus one standard deviation) denitrification rates in August 2001 under ambient and amended conditions at two sites, BLS and BDO. (Site characteristics are given in Table 1.) Within a site, treatments with different letters are significantly different from each other (p < 0.05, Tukey's pairwise comparisons). AFDM, ash-free dry mass; DOC, dissolved organic carbon.

View larger version (36K): [in a new window]   Fig. 4. Calculated denitrification uptake length (Sw,dn) and measured stream water concentrations of NO3–N at sites BDO, LFK, and EMC, 1993–2002. (Site characteristics are given in Table 1.) The term Sw,dn was calculated using stream gaging records and an in-stream denitrification rate of 15 mg N m–2 h–1.

View larger version (21K): [in a new window]   Fig. 5. Relationship between mean daily discharge and stream NO3–N concentration for January 2001 through January 2002 in a headwater agricultural stream in Illinois. (Site characteristics are given in Table 1.)

View larger version (32K): [in a new window]   Fig. 6. (A) Nitrate concentrations at site BLS, January 2001 through January. (B) Mean daily nitrate load and measured rates of nitrate N loss, –k (% d–1), for site BLS. (Site characteristics are given in Table 1.)