Baseflow nitrate in relation to stream order and agricultural land use

Shujiang Kang, Hangsheng Lin, William J. Gburek, Gordon J. Folmar, Birl Lowery

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Management of agricultural nonpoint-source pollution continues to be a challenge because of spatial and temporal variability. Using stream order as an index, we explored the distribution of nitrate concentration and load along the stream network of a large agricultural watershed in Pennsylvania - the East Mahantango Creek Watershed and two of its subwatersheds. To understand nitrate concentration variation in the stream water contributed from ground water, this study focused on baseflow. Impacts of agricultural land use area on baseflow nitrate in the stream network were investigated. Nitrate concentration showed a general decreasing trend with increasing stream order based on stream order averaged values; however, considerable spatial and temporal variability existed within each snapshot sampling. Nitrate loads increased with stream order in a power function because of the dominant effect of stream flow rate over ihe nitrate concentration. Within delineated subwatersheds based on stream orders, positive linear functions were found between agricultural land use area percentage and the baseflow nitrate concentration and between agricultural drainage area and the nitrate load. The slope of the positive linear regression between the baseflow nitrate concentration and percent agricultural land area seems to be a valuable indicator of a watershed s water quality as influenced by agricultural practices, watershed size, and specific physiographic setting. Stream order seems to integtate, to a certain degree, the source and transport aspects of nonpoint-source pollution on a yearly averaged basis and thus might provide a quick estimate of the overall trend in baseflow nitrate concentration and load distribution along complex stream networks in agricultural watersheds.

Original languageEnglish (US)
Pages (from-to)808-816
Number of pages9
JournalJournal of Environmental Quality
Volume37
Issue number3
DOIs
StatePublished - May 1 2008

Fingerprint

baseflow
Land use
Nitrates
agricultural land
nitrate
land use
Watersheds
watershed
nonpoint source pollution
Pollution
Stream flow
agricultural practice
Linear regression
Drainage
Water quality
streamflow
Groundwater
Flow rate
drainage
Sampling

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution
  • Management, Monitoring, Policy and Law

Cite this

Kang, Shujiang ; Lin, Hangsheng ; Gburek, William J. ; Folmar, Gordon J. ; Lowery, Birl. / Baseflow nitrate in relation to stream order and agricultural land use. In: Journal of Environmental Quality. 2008 ; Vol. 37, No. 3. pp. 808-816.
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Baseflow nitrate in relation to stream order and agricultural land use. / Kang, Shujiang; Lin, Hangsheng; Gburek, William J.; Folmar, Gordon J.; Lowery, Birl.

In: Journal of Environmental Quality, Vol. 37, No. 3, 01.05.2008, p. 808-816.

Research output: Contribution to journalArticle

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