Deriving photosynthetic function from calibrated imaging spectrometry

J. A. Gamon, R. O. Green, D. A. Roberts, L. Serrano

Research output: Contribution to journalArticlepeer-review


The photochemical reflectance index (PRI) is an indicator of photosystem II photochemical efficiency of top-canopy leaves. We examined the potential of this index to derive photosynthetic function from calibrated imaging spectrometer data using AVIRIS. Although PRI declines with expected canopy photosynthetic capacity across several vegetation types, this relationship appears to be confounded by the strong correlations between PRI and several indicators of canopy greenness, including NDVI, green vegetation fraction, and liquid water. Sensitivity analyses suggest that at this larger scale, PRI is increasingly influenced by the relative content of leaf pigments and by green leaf area index (LAI), calling into question a simple physiological interpretation of PRI at scales larger than the monospecific canopy. -Authors

Original languageEnglish (US)
Pages (from-to)55-60
Number of pages6
JournalUnknown Journal
StatePublished - 1995
Externally publishedYes

ASJC Scopus subject areas

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)


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