A proposal for universal formulas for estimating leaf water status of herbaceous and woody plants based on spectral reflectance properties

By Guiping Yu, Takuji Miwa, K. Nakayama, N. Matsuoka, H. Kon. Plant and Soil, 2000

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Spectral sensing of foliar water conditions in two co-occurring conifer species: Pinus edulis and Ju (2005, background): “Although the potential for assessment of water condition via evaluation of spectral properties of foliage has been demonstrated, previous studies have focused primarily on leaves of broadleaf species grown for this purpose (Adams et al., 1999; Bowman, 1989; Ceccato et al., 2001; Inoue et al., 1993; ”
Characterizing canopy biochemistry from imaging spectroscopy and its application to ecosystem studies (2009, background): “Many empirical studies have evaluated water content algorithms based on analyses of leaf spectra, where leaves were measured in an integrating sphere or as a stack of foliage (Kokaly & Clark,1999; Sims & Gamon, 2003; Stimson et al., 2005; Yu et al., 2000).”
Combining leaf physiology, hyperspectral imaging and partial least squares-regression (PLS-R) for grapevine water status assessment (2015, methodology): “…predictive power that is presented in many studies, which has been derived from the application of widelyused, so-called ‘‘universal” indices (e.g., Yu et al., 2000); namely, as the same stressing agent may produce distinctly different spectral responses across species and growing environments…”