Publication Information
Title: Evaluation of field performance of poplar clones using selected competition indices.
Author: Brodie, Chandler; DeBell, D.S.
Date: 2004
Source: New Forests. 27: 201–214
Description: Use of competition indices in the analysis of forestry experiments may improve detection and understanding of treatment effects, and thereby improve the application of results. In this paper, we compared the performance of eight indices in an analysis of a spacing trial of four Populus clones planted in pure and mixed clonal plots. Indices were included as covariates in analyses of variance and evaluated on their ability to decrease mean square error. Indices that were simple to calculate (i.e., required only diameter and spacing or distance information) decreased mean square error by as much as 32%. We then illustrate the use of a simple index to assess clonal response to intra- and inter-genotypic competition and to interpret treatment effects confounded by different levels of competition. In pure clonal plots (intra-genotypic competition), all the clones tested reacted similarly to competition, while the same clones tested in mixed plots (inter-genotypic competition) reacted differently to varying levels of competition. The use of a competition index to assess clone rankings within a mixed clonal plot can be an effective way to predict clonal performance within a mono-clonal planting.
Keywords: Analysis, clone, competition index, Populus
View and Print this Publication (4.22 MB)
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.
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility
Citation
Brodie, Chandler; DeBell, D.S. 2004. Evaluation of field performance of poplar clones using selected competition indices.. New Forests. 27: 201–214
|