An Index of Competition Based on Relative Crown Position and Size

Dwight D. O'Neal; Allan E. Houston; Edward R. Buckner; James S. Meadows

Treesearch

An Index of Competition Based on Relative Crown Position and Size

Informally Refereed

Authors:

Dwight D. O'Neal, Allan E. Houston, Edward R. Buckner, James S. Meadows

Year:

1995

Type:

Scientific Journal

Station:

Southern Research Station

Source:

In: Edwards, M. Boyd, comp. Proceedings of the eighth biennial southern silvicultural research conference; 1994 November 1-3; Auburn, AL. Gen. Tech. Rep. SRS-1. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station: 172-175

Download (PDF 94 KB)

Download (PDF 94 KB): https://research.fs.usda.gov/download/treesearch/3270.pdf

Abstract

A new competition index, the Crown Position Index (CPI) was evaluated using a 41-year-old, well stocked, upland hardwood stand in southwestern Tennessee. CPI wss based on relative crown position and crown size as expressed by crown projections and relative heights of crop trees and their competitors. Comparisons were made among CPI, the Hegyl (1974) index, and a value of Direct Sunligt from the Side (DSS). Correlations of each measure of competition with 1 and 2 year crop tree diameter growth were used as criteria for analysis. The highest r-values were calculated using DSS followed by the Hegyl index snd CPI respectively.

Citation

O''Neal, Dwight D.; Houston, Allan E.; Buckner, Edward R.; Meadows, James S. 1995. An Index of Competition Based on Relative Crown Position and Size. In: Edwards, M. Boyd, comp. Proceedings of the eighth biennial southern silvicultural research conference; 1994 November 1-3; Auburn, AL. Gen. Tech. Rep. SRS-1. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station: 172-175