Relationship between light use efficiency and photochemical reflectance index in soybean leaves as affected by soil water content

Y. Inoue, J. Peñuelas

    Research output: Contribution to journalArticleResearchpeer-review

    32 Citations (Scopus)

    Abstract

    Photosynthetic light response curves and reflectance spectra (380-2500 nm) were measured for soybean (Glycine max L. Merr.) leaves with a range of chlorophyll concentrations at various soil water contents. Regression lines for the relationship between the photosynthetic light use efficiency (LUEp) and photochemical reflectance index (PRI) under different soil water content θ almost all passed through a common point (PRI, LUEp) = (-0.04, 0), so that the LUEp could be expressed simply as LUEp = kAPRI using an adjusted PRI [APRI = (ρ531-ρ570)/(ρ531-ρ570)+0.04]. The effect of soil moisture was strong under dry conditions and gradually decreased with increasing θ. There was no effect of θ above 25% (v/v). The effect of θ on the APRI-LUEp relationship was expressed by a simple exponential function. These results should provide a new basis for applications in dynamic diagnosis of photosynthetic functioning of plant leaves and in the prediction of plant productivity. The change in the slope of LUE vs. APRI may provide further ways of assessing volumetric soil water content.
    Original languageEnglish
    Pages (from-to)5109-5114
    JournalInternational Journal of Remote Sensing
    Volume27
    Issue number22
    DOIs
    Publication statusPublished - 20 Nov 2006

    Fingerprint Dive into the research topics of 'Relationship between light use efficiency and photochemical reflectance index in soybean leaves as affected by soil water content'. Together they form a unique fingerprint.

    Cite this