Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 42, Issue 8, Pages 2977-2987Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015GL063201
Keywords
plant physiology; remote sensing; spectroscopy; chlorophyll fluorescence; gross primary production; carbon cycle
Categories
Funding
- Marine Biological Laboratory
- Brown University-Marine Biological Laboratory graduate program in Biological and Environmental Sciences
- U.S. Department of Energy Office of Biological and Environmental Research [DE-SC0006951]
- National Science Foundation [DBI-959333, AGS-1005663, EF-1065029, DEB-1237491]
- Direct For Biological Sciences
- Division Of Environmental Biology [1237491] Funding Source: National Science Foundation
- Direct For Biological Sciences
- Emerging Frontiers [1065029] Funding Source: National Science Foundation
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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 760nm in temperate deciduous forests. SIF correlated with GPP estimated with eddy covariance at diurnal and seasonal scales (r(2)=0.82 and 0.73, respectively), as well as with APAR diurnally and seasonally (r(2)=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 (r(2)=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.
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