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 (448 KB bytes)

Title: Eastern cottonwood clonal mixing study: intergenotypic competition effects

Author: Foster, G. Sam; Rousseau, R.J.; Nance, W.L;

Date: 1998

Source: Forest Ecology and Management. 112: 9-22.

Publication Series: Miscellaneous Publication

Description: Intergenotypic competition of seven clones of eastern cottonwood (Populus deltoides) was evaluated in a replacement series experiment. A partial diallel competition design was used to choose pairs (binary sets) of clones for plot type treatments. Two separate treatments were established for each pair of clones, namely (1) 75 percent clone A: 25 percent clone B and (2) 25 percent clone A: 75 percent clone B. Twenty-one treatments were established in the study: seven pure clone treatments and 14 mixed treatments (seven pairs of clones each at two ratios). Two study sites (Vicksburg, Mississippi and Wickliffe, Kentucky) were used. Results are presented for stand ages two, three, and four years which corresponds to the lower to mid-length rotation for the species for a short rotation woody crop (either biomass for energy or fiber for pulp and paper). Average plot height at an age of 4 years was 13.23 m. Plot total yield was affected by intergenotypic competition. The type and level of response to mixing clones depended on the specific clones involved and the planting site. Usually, the most predictable opportunity for over- or underyielding when in binary mixture occurred for clones which differed substantially in pure plot growth and yield. The yield of mixtures of clones of more similar growth patterns sometimes differed significantly from that expected from an additive model, but this was less common. When significant differences did occur between pure clone yields and the yields of their binary mixtures, the plot yield was often a linear function of the proportion of the best clone. Overyielding of mixtures occurred, with additional yields of up to 27 percent of the mixture over the best clone's pure plot yield.

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.
  • You may send email to pubrequest@fs.fed.us to request a hard copy of this publication. (Please specify exactly which publication you are requesting and your mailing address.)

XML: View XML

Citation:


Foster, G. Sam; Rousseau, R.J.; Nance, W.L 1998. Eastern cottonwood clonal mixing study: intergenotypic competition effects. Forest Ecology and Management. 112: 9-22.

 


 [ 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.