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

Abstract

 

This article in JEQ

  1. Vol. 24 No. 5, p. 808-815
     
    Received: Dec 10, 1993
    Published: Sept, 1995


    * Corresponding author(s): lorenz@tifton.cpes.peachnet.edu
 View
 Download
 Alerts
 Permissions

doi:10.2134/jeq1995.00472425002400050003x

Denitrification in a Restored Riparian Forest Wetland

  1. Richard Lowrance *,
  2. George Vellidis and
  3. Robert K. Hubbard
  1. USDA-ARS, Southeast Watershed Res. Lab., P.O. Box 946, Tifton, GA 31793;
    Dep. of Biological and Agric. Eng., Univ. of Georgia, Coastal Plain Exp. Stn., P.O. Box 748, Tifton, GA 31793.

Abstract

Abstract

Groundwater nitrate moving from upland areas toward streams can be removed by denitrification in mature riparian forests, but denitrification in restored riparian forests has not been quantified. We determined denitrification rates in a restored riparian wetland below a liquid manure application site. A riparian forest buffer consisting of hardwoods along the stream and pines above the hardwoods was established according to USDA specifications. Denitrification was measured monthly using the acetylene inhibition technique on intact soil cores for 2 mo before manure application began and for 24 mo after manure application. Groundwater movement of NO3-N and total Kjeldahl N were estimated biweekly. Average annual denitrification rate was 68 kg N2O-N ha−1 yr−1. Denitrification was significantly higher in a grassed area than in either of the forested areas. Denitrification did not differ significantly between the hardwood and pine areas. Denitrification was greater than a conservative estimate of groundwater input of total N. Denitrification rates were higher in April and May 1992 and 1993, after manure application to the upland began, compared with April and May 1991, before manure application began. These results indicate that a riparian wetland, which has not undergone hydrologic modifications, can have denitrification rates comparable to mature riparian forests. Higher denitrification rates in an adjacent grassed wetland and lack of differences in denitrification in hardwood and pine zones indicates that the high denitrification rates were due to factors other than the reforestation itself. Compared with groundwater inputs of N, denitrification was an important sink for N moving from the upland management system.

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

Copyright © .

Facebook   Twitter