Skip to page content
USDA Forest Service
  
Treesearch

Research & Development Treesearch

 
Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Northern
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern Research Station
Help
 

Science.gov - We Participate


USA.gov  Government Made Easy


Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.
20090-6090

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

View PDF (1.0 MB byte)

Title: Ecosystem nutrient responses to chronic nittogen inputs at Fernow Experimental Forest, West Virginia

Author: ​Gilliam, Frank S.; Adams, Mary Beth; Yurish, Bradley M.;

Date: 1996

Source: Canadian Journal of Forest Research. 26: 196-205.

Publication Series: Scientific Journal (JRNL)

Description: Among the current environmental concerns for forests of the eastern United States is nitrogen (N) saturation, a result of excessive inputs of N associated with acidic deposition. We studied nutrient responses on N-treated and untreated watersheds of the Fernow Experimental Forest, West Virginia, to test for evidence of N saturation on the treated watershed. The watersheds were WS7 (23-year-old even-aged control), WS4 (mature mixed-aged control), and WS3 (23-year-old even-aged treatment). WS3 has received aerial applications of (NH4)2S04 from 1989 to the present (a total of 4 years for the study period) at 3X ambient inputs of N and S (54 and 61 kg·ha-1·year-1, respectively). Base-flow stream samples were collected weekly from each watershed and analyzed for NO3- and Ca 2+. Mineral soil was incubated in situ, placed in bags, and buried about every 30 days during the growing season in each of seven sample plots within each watershed. Moist samples of soil from the bags were analyzed for extractable NH4+ and NO3- . In addition, forest floor material and leaves of an herbaceous species (Viola rotundifolia Michx.) from each plot were analyzed for N and other nutrients. Viola rotundifolia was present on all 21 plots and used as an additional indicator of N availability and soil fertility. Foliage tissue was sampled from overstory tree species (Liriodendron tulipifera L., Prunus serotina Ehrh., Betula lenta L., and Acer rubrum L.) from WS3 and WS7 and analyzed for nutrient content. Results from the 1993 growing season showed few, if any, differences among watersheds for ( 1) N content and C/N ratio of the mineral soil and forest floor and (2) relative proportion of NH4+ and NO3- produced in the buried bags. Nitrification rates were equally high in soils of all watersheds; N concentrations were significantly higher in foliage tissue of overstory tree species and of V. rotundifolia in the treatment versus control watersheds; plant tissue Ca was significantly lower for the treatment watershed than for the control watersheds. Our results support the conclusions of earlier studies that high amounts of ambient N deposition have brought about N saturation on untreated watersheds at the Fernow Experimental Forest. This is suggested by minimal differences among watersheds in N mineralization and nitrification and soil and forest floor N. However, aggravated N saturation on our treated watershed can be seen in differences in plant tissue nutrients among watersheds and streamflow data, indicating increased losses of N03- with accompanying losses of Ca2+ in response to further N additions to a N-saturated system.

Keywords: Fernow Experimental Forest

Publication Notes:

  • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
  • This publication may be available in hard copy. Check the Northern Research Station web site to request a printed copy of this publication.
  • Our on-line publications are scanned and captured using Adobe Acrobat. During the capture process some typographical errors may occur. Please contact Sharon Hobrla, shobrla@fs.fed.us if you notice any errors which make this publication unusable.

XML: View XML

Citation:


​Gilliam, Frank S.; Adams, Mary Beth; Yurish, Bradley M. 1996. Ecosystem nutrient responses to chronic nittogen inputs at Fernow Experimental Forest, West Virginia. Canadian Journal of Forest Research. 26: 196-205.

 


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.