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Oecologia

, Volume 165, Issue 2, pp 289–299 | Cite as

Predicting tropical plant physiology from leaf and canopy spectroscopy

  • Christopher E. Doughty
  • Gregory P. Asner
  • Roberta E. Martin
Physiological ecology - Original Paper

Abstract

A broad regional understanding of tropical forest leaf photosynthesis has long been a goal for tropical forest ecologists, but it has remained elusive due to difficult canopy access and high species diversity. Here we develop an empirical model to predict sunlit, light-saturated, tropical leaf photosynthesis using leaf and simulated canopy spectra. To develop this model, we used partial least squares (PLS) analysis on three tropical forest datasets (159 species), two in Hawaii and one at the biosphere 2 laboratory (B2L). For each species, we measured light-saturated photosynthesis (A), light and CO2 saturated photosynthesis (A max), respiration (R), leaf transmittance and reflectance spectra (400–2,500 nm), leaf nitrogen, chlorophyll a and b, carotenoids, and leaf mass per area (LMA). The model best predicted A [r 2  = 0.74, root mean square error (RMSE) = 2.9 μmol m−2 s−1)] followed by R (r 2  = 0.48), and A max (r 2  = 0.47). We combined leaf reflectance and transmittance with a canopy radiative transfer model to simulate top-of-canopy reflectance and found that canopy spectra are a better predictor of A (RMSE = 2.5 ± 0.07 μmol m−2 s−1) than are leaf spectra. The results indicate the potential for this technique to be used with high-fidelity imaging spectrometers to remotely sense tropical forest canopy photosynthesis.

Keywords

Photosynthesis Tropical forests Spectranomics Spectra Gas exchange Remote sensing CAO 

Notes

Acknowledgments

We thank K. Kinney, J. Kellner, and E. Broadbent for help in the field, and C. Field for advice. This work is funded by a Carnegie Institution fellowship, the NASA Terrestrial Ecology Biodiversity Program, and the John D. and Catherine T. MacArthur Foundation.

Supplementary material

442_2010_1800_MOESM1_ESM.docx (33 kb)
Supplementary material (DOCX 33 kb)

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Christopher E. Doughty
    • 1
  • Gregory P. Asner
    • 1
  • Roberta E. Martin
    • 1
  1. 1.Department of Global EcologyCarnegie InstitutionStanfordUSA

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