My Account: Log In | Join | Renew
Search
Author
Title
Vol.
Issue
Year
1st Page

Abstract

 

This article in JEQ

  1. Vol. 26 No. 3, p. 836-848
     
    Received: Feb 23, 1996
    Published: May, 1997


    * Corresponding author(s): jordan@serc.si.edu
 View
 Download
 Alerts
 Permissions

doi:10.2134/jeq1997.00472425002600030034x

Effects of Agriculture on Discharges of Nutrients from Coastal Plain Watersheds of Chesapeake Bay

  1. Thomas E. Jordan *,
  2. David L. Correll and
  3. Donald E. Weller
  1. Smithsonian Environmental Research Center, Edgewater, MD 21037.

Abstract

Abstract

We measured annual discharges of water, sediments, and nutrients from 17 Chesapeake Bay watersheds with differing proportions of agricultural lands on the inner, central, and outer Coastal Plain. In all regions of the Coastal Plain, the flow-weighted mean concentrations of N species in watershed discharge increased as the proportion of cropland in the watershed increased. In contrast, the concentrations of P species did not correlate with any land use. Instead, P concentrations correlated with the concentration of suspended particles, which differed greatly among watersheds in different regions of the Coastal Plain. Consequently, the ratio of N/P in discharges differed widely among watersheds, potentially affecting N or P limitation of phytoplankton growth in the receiving waters. Concentrations of dissolved silicate, organic C, pH, and alkalinity in discharges did not differ greatly among watersheds or correlate with land use. Nitrogen discharge correlated with net anthropogenic inputs of N to the watershed, but usually less than one-third of the net anthropogenic inputs were discharged.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © .

Facebook   Twitter