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 language | English (US) |
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Pages (from-to) | 2977-2987 |
Number of pages | 11 |
Journal | Geophysical Research Letters |
Volume | 42 |
Issue number | 8 |
DOIs | |
State | Published - Apr 28 2015 |
Externally published | Yes |
Keywords
- carbon cycle
- chlorophyll fluorescence
- gross primary production
- plant physiology
- remote sensing
- spectroscopy
ASJC Scopus subject areas
- Geophysics
- General Earth and Planetary Sciences