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Holz als Roh- und Werkstoff

, Volume 63, Issue 3, pp 231–236 | Cite as

Tracheid length prediction in Pinus palustris by means of near infrared spectroscopy: the influence of age

  • B. K. Via
  • T. F. Shupe
  • M. Stine
  • C. L. So
  • L. H. Groom
Originalarbeiten/Originals

Abstract

The prediction of tracheid length using near infrared (NIR) wavelengths can provide either useful or misleading calibrations depending on the context. This can happen since tracheid length is not directly related to the absorbance at any wavelength but is instead the result of a secondary correlation with some unknown chemical constituent. In this work, the effect of tree age and height on NIR predictability was investigated since tracheid length and chemistry may vary as a function of location within the tree. It was found that tracheid length predictability did not change with height but decreased with age. As a result, predicting tracheid length regardless of age was good (R2 = 0.72) while predictability holding age and height constant was mostly low to moderate with the exception of rings 1 and 4 which was quite strong.

Keywords

Principal Component Regression Near Infrared Spectroscopy Primary Cell Wall Juvenile Wood Mature Wood 

Vorhersage der Tracheidenlänge in Pinus palustris mittels NIR-Spektroskopie: Einfluss des Alters

Zusammenfassung

Das Abschätzen der Tracheidenlänge mittels NIR-Spektroskopie kann je nach Sachlage zu brauchbaren oder auch irreführenden Kalibrierungen führen. Das kommt daher, dass die Tracheidenlänge nicht unmittelbar mit der Extinktion bei irgendeiner Wellenlänge in Beziehung steht, sondern über eine indirekte Korrelation mit unbekannten Inhaltsstoffen. In dieser Arbeit wird der Einfluss des Baumalters und der Höhe auf die Verlässlichkeit der NIR-Messung untersucht, da sowohl die Tracheidenlänge als auch die chemischen Bestandteile je nach Position im Baum varieren können. Es zeigte sich, dass die Vorhersagbarkeit der Tracheidenlänge sich nicht mit der Baumhöhe ändert, jedoch mit dem Alter abnimmt. Insgesamt war die Vorhersagbarkeit der Tracheidenlänge unabhängig vom Alter recht gut (R2=0,72); bei konstantem Baumalter und -höhe war sie jedoch mäßig bis niedrig außer für die Jahrringe 1 und 4, wo die Korrelation sehr streng war.

Notes

Acknowledgements

This study was funded by the USDA National Research Initiative Competitive Grants Program Agreement No. 2001-35103-10908. This paper (No. 03-40-1432) is published with the approval of the Director of the Louisiana Agricultural Experiment Station. The authors gratefully acknowledge the contribution of Jim Roberds and Larry Lott, USDA Forest Service, Southern Research Station, Southern Institute of Forest Genetics, Saucier, Mississippi, USA. Bob Megraw, a retired scientist, and Dr. Laurie Schimleck, University of Georgia, are also thanked for their reviews and suggestions.

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • B. K. Via
    • 1
  • T. F. Shupe
    • 1
  • M. Stine
    • 1
  • C. L. So
    • 1
  • L. H. Groom
    • 2
  1. 1.School of Renewable Natural ResourcesLouisiana State University AgCenterBaton RougeUSA
  2. 2.USDA Forest ServiceSouthern Research StationPinevilleUSA

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