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A Comparison of Methods for Measuring Effects of Density and Proportion in Plant Competition Experiments

Published online by Cambridge University Press:  12 June 2017

Mary Lynn Roush ,
Steven R. Radosevich ,
Robert G. Wagner ,
Bruce D. Maxwell  and
Terry D. Petersen
Mary Lynn Roush
Affiliation:
Dep. Forest Sci., Oregon State Univ., Corvallis, OR 97331
Steven R. Radosevich
Affiliation:
Dep. Forest Sci., Oregon State Univ., Corvallis, OR 97331
Robert G. Wagner
Affiliation:
Dep. Forest Sci., Oregon State Univ., Corvallis, OR 97331
Bruce D. Maxwell
Affiliation:
Dep. Forest Sci., Oregon State Univ., Corvallis, OR 97331
Terry D. Petersen
Affiliation:
Dep. Forest Sci., Oregon State Univ., Corvallis, OR 97331
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Abstract

Three approaches to data analysis were compared to describe competitive interactions between wheat and Italian ryegrass. Replacement series were performed using the two species at total densities of 100, 200, and 400 plants/ m2, and separate monoculture experiments for each species at densities from 33 to 800 plants/m2. Approaches to data analysis included: 1) conventional analysis of replacement series experiments, 2) development of synthetic no-interaction responses from monoculture experiments for comparison with results from mixtures, and 3) responses of the reciprocal yield of individual plants to variation in densities of the two species. Wheat was the superior competitor to ryegrass; however, the three approaches varied in ability to quantify this competitive relationship. The conventional replacement series analysis was least sensitive in describing the influences of either density or proportion on the plant association. The synthetic no-interaction approach provided the most detailed analysis of the influence of proportion on the species interaction. The reciprocal yield approach provided the simplest and most sensitive analysis of the joint influences of density and proportion. The latter approach also provided the most quantitative analysis of the influence of density on the species interaction. Plant density and species proportion are important variables for interpreting the process of plant competition.

Keywords

Italian ryegrass, Lolium multiflorum Lam. ♯3 LOLMUwheat, Triticum aestivum L. ‘Stephens’NDI, niche differentiationAddition seriesreciprocal yield lawreplacement serieswheatTriticum aestivumLolium multiflorumLOLMU
Type
Special Topics
Information
Weed Science , Volume 37 , Issue 2 , March 1989 , pp. 268 - 275
Copyright
Copyright © 1989 by the Weed Science Society of America 

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References

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