JEQ
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Published online 27 October 2006
Published in J Environ Qual 35:2132-2145 (2006)
DOI: 10.2134/jeq2006.0157
© 2006 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
This Article
Right arrow Abstract Freely available
Right arrow Full Text Free
Right arrow Full Text (PDF) Free
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Schilling, K. E.
Right arrow Articles by Spooner, J.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Schilling, K. E.
Right arrow Articles by Spooner, J.
Agricola
Right arrow Articles by Schilling, K. E.
Right arrow Articles by Spooner, J.
Related Collections
Right arrow Watershed and Landscape Processes
Right arrow Surface Water Quality
Right arrow Cover Crops

Effects of Watershed-Scale Land Use Change on Stream Nitrate Concentrations

Keith E. Schillinga,* and Jean Spoonerb

a Iowa Department of Natural Resources, Iowa Geological Survey, 109 Trowbridge Hall, Iowa City, IA 52242-1319
b Soil & Water Environmental Technology Center (SWETC), North Carolina State University, Box 7637, Raleigh, NC 27695-7637


Figure 1
View larger version (47K):

[in a new window]
  		Fig. 1. Location map including locations of prairie plantings, subbasins, and stream sampling locations.

 

Figure 2
View larger version (22K):

[in a new window]
  		Fig. 2. Summary of annual prairie plantings by USFWS at the Neal Smith NWR.

 

Figure 3
View larger version (27K):

[in a new window]
  		Fig. 3. Box plot of total discharge and average monthly baseflow percentage (open squares) by month at WNT2 and SQW2 gauging stations. Box plots illustrate the 25th, 50th, and 75th percentiles; the whiskers indicate the 10th and 90th percentiles; and the circles represent data outliers.

 

Figure 4
View larger version (45K):

[in a new window]
  		Fig. 4. Time series of nitrate concentrations measured at upstream downstream sites in the Walnut and Squaw creek watersheds.

 

Figure 5
View larger version (35K):

[in a new window]
  		Fig. 5. Box plot of nitrate concentrations by water year at upstream and downstream sites in the Walnut and Squaw creek watersheds.

 

Figure 6
View larger version (46K):

[in a new window]
  		Fig. 6. Box plot of nitrate concentrations by water year at subbasin monitoring sites in the Walnut and Squaw creek watersheds.

 

Figure 7
View larger version (33K):

[in a new window]
  		Fig. 7. Box plot of nitrate concentrations by month at upstream and downstream sites in the Walnut and Squaw creek watersheds.

 

Figure 8
View larger version (16K):

[in a new window]
  		Fig. 8. Relation of nitrate concentrations at WNT2 to regression covariates.

 

Figure 9
View larger version (17K):

[in a new window]
  		Fig. 9. Relation of change in nitrate in stream nitrate concentrations (as determined by statistical methods) to change in percentage of land cover in row crops in watersheds and subbasins.

 




HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
and Life Sciences Education		 Vadose Zone Journal
Soil Science Society of America Journal Journal of Plant Registrations The Plant Genome
Copyright © 2006 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.