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Irrigation Science

, Volume 26, Issue 5, pp 407–414 | Cite as

Extraneous variables and their influence on reflectance-based measurements of leaf water content

  • Hans-Dieter SeeligEmail author
  • William W. AdamsIII
  • Alexander Hoehn
  • Louis S. Stodieck
  • David M. Klaus
  • William J. Emery
Original Paper

Abstract

Leaf water indices based on leaf reflectance may depend not only on the variable of interest, leaf water content, but may also be influenced by a variety of extraneous variables, leading to considerable data variability if such extraneous variables are not eliminated or taken into account. Here, we examined the nature of three potential extraneous variables: homogeneity of the leaf target area, the distance between a primary reflecting leaf and background material, and measurement sensitivity at various wavelengths. Although leaf water indices appear to be homogeneously distributed between major leaf veins, they may fluctuate substantially in areas where major veins are present. Leaf water indices may also depend to some extent on the distance between a primary reflecting leaf and any reflecting background material, at least for small distances. Leaf water indices utilizing the 970 or 1200 nm water absorption bands have been shown to be rather insensitive to changes in leaf water content, potentially resulting in low signal-to-noise ratios, an additional source of data variability.

Keywords

Leaf Water Extraneous Variable Background Material Data Variability Water Deficit Stress 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

H.-D.S. gratefully acknowledges financial assistance from BioServe Space Technologies (NASA NCC8-242) at the University of Colorado.

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Hans-Dieter Seelig
    • 1
    Email author
  • William W. AdamsIII
    • 2
  • Alexander Hoehn
    • 1
  • Louis S. Stodieck
    • 1
  • David M. Klaus
    • 1
  • William J. Emery
    • 1
  1. 1.Department of Aerospace Engineering SciencesUniversity of Colorado at BoulderBoulderUSA
  2. 2.Department of Ecology and Evolutionary BiologyUniversity of Colorado at BoulderBoulderUSA

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