Solar-induced chlorophyll fluorescence that correlates with canopy photosynthesis on diurnal and seasonal scales in a temperate deciduous forest

Xi Yang, Jianwu Tang, John F. Mustard, Jung Eun Lee, Micol Rossini, Joanna Joiner, J. William Munger, Ari Kornfeld, Andrew D. Richardson

Research output: Contribution to journalArticlepeer-review

332 Scopus citations

Abstract

Previous studies have suggested that solar-induced chlorophyll fluorescence (SIF) is correlated with Gross Primary Production (GPP). However, it remains unclear to what extent this relationship is due to absorbed photosynthetically active radiation (APAR) and/or light use efficiency (LUE). Here we present the first time series of near-surface measurement of canopy-scale SIF at 760 nm in temperate deciduous forests. SIF correlated with GPP estimated with eddy covariance at diurnal and seasonal scales (r2 = 0.82 and 0.73, respectively), as well as with APAR diurnally and seasonally (r2 = 0.90 and 0.80, respectively). SIF/APAR is significantly positively correlated with LUE and is higher during cloudy days than sunny days. Weekly tower-based SIF agreed with SIF from the Global Ozone Monitoring Experiment-2 (r2 = 0.82). Our results provide ground-based evidence that SIF is directly related to both APAR and LUE and thus GPP, and confirm that satellite SIF can be used as a proxy for GPP.

Original languageEnglish (US)
Pages (from-to)2977-2987
Number of pages11
JournalGeophysical Research Letters
Volume42
Issue number8
DOIs
StatePublished - Apr 28 2015
Externally publishedYes

Keywords

  • carbon cycle
  • chlorophyll fluorescence
  • gross primary production
  • plant physiology
  • remote sensing
  • spectroscopy

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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