Effects of leaf age and psyllid damage on the spectral reflectance properties of Eucalyptus saligna foliage
Christine Stone A D , Laurie Chisholm B and Simon McDonald CA Research & Development Division, State Forests NSW, PO Box 100, Beecroft, NSW 2119, Australia.
B School of Earth and Environmental Sciences, University of Wollongong, Wollongong, NSW 2522, Australia.
C Spatial Analysis Network—Albury/Thurgoona, Charles Sturt University, Albury, NSW 2640, Australia.
D Corresponding author. Email: christines@sf.nsw.gov.au
Australian Journal of Botany 53(1) 45-54 https://doi.org/10.1071/BT04062
Submitted: 7 May 2004 Accepted: 25 August 2004 Published: 18 February 2005
Abstract
Leaf chlorophyll content is influenced directly by many environmental stress factors. Because leaf pigment absorption is wavelength dependent, numerous narrow-band reflectance-based indices have been proposed as a means of assessing foliar health and condition. Chlorophyll content, however, also varies with leaf developmental stage. In this study, a range of morphological and physiological traits including insect damage, relative chlorophyll content (SPAD values), chlorophyll fluorescence (Fv/Fm) and reflectance spectra was measured of leaves sampled from mature Eucalyptus saligna. Relative differences among three leaf-age cohorts were compared with differences obtained from mature leaves that were either healthy or infested with the psyllid Glycaspis baileyi. Differences in relative chlorophyll content were greater between immature and mature foliage than between damaged and healthy mature leaves. These differences were confirmed in the comparisons of reflectance spectra and indices. As many eucalypt species have opportunistic crown phenology and long-lived leaves, leaf-age composition of crowns needs to be taken into account when applying reflectance-based indices to assess foliar condition of eucalypts.
Acknowledgments
We thank Jack Simpson, Darren Waterson, Grahame Price, Amelia Jones and Michael Berry (State Forests of New South Wales) for their technical and field assistance. We also thank Craig Barton (State Forests of New South Wales) for comments on an earlier draft of the manuscript.
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