Plant and Soil

, Volume 115, Issue 1, pp 129–134 | Cite as

Errors in estimating total root length by sub-samples method

  • R. Habib
  • J Chadoeuf
Article

Abstract

A new method has been proposed to estimate the total length in a sample, and it assumes that roots are cylinders with a given bulk density. The technique is based on the measurement of the length and diameter of small pieces of roots, and on the measurement of the bulk density of root sub-samples. An exact formulation is presented of the error distribution in estimating total root length. This leads to a simple formula which relates directly the variance of the root length estimates to both the number of roots used in estimating the root characteristics, and the number of sub-samples used in estimating the mean bulk density of the samples. This enables analyses of experimental designs with respect to sample size and accuracy.

Key words

error distributions image analysis root bulk density sampling simulation tree root system 

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References

  1. Dacunha-Castelle D and Duflo M 1983 Probabilités et statistiques. 2. Problèmes à temps mobile. Masson Ed. (Paris), 85–114.Google Scholar
  2. Habib R 1988 Total root length as estimated from small subsamples. Plant and Soil 108, 267–274.Google Scholar
  3. Monnier G, Stengel P and Fies J C 1973 Une méthode de mesure de la densité apparente de petits agglomérats terreux. Application à l'analyse des systèmes de porosité du sol. Ann. Agron. 24, 533–545.Google Scholar

Copyright information

© Kluwer Academic Publishers 1989

Authors and Affiliations

  • R. Habib
    • 1
  • J Chadoeuf
    • 2
  1. 1.Station d'AgronomieINRAMontfavetFrance
  2. 2.Laboratoire de BiométrieINRAMontfavetFrance

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