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Comparison of total emitted solar-induced chlorophyll fluorescence (SIF) and top-of-canopy (TOC) SIF in estimating photosynthesis

Journal Article · · Remote Sensing of Environment
 [1];  [1];  [2];  [3]
  1. Northwest A&F University (China); Marine Biological Laboratory, Woods Hole, MA (United States)
  2. Beijing University of Aeronautics and Astronautics (China)
  3. Marine Biological Laboratory, Woods Hole, MA (United States)
We report many studies have shown that solar-induced fluorescence (SIF) has a good potential to predict gross primary production (GPP) of vegetation. What we measured by remote sensing or near-surface platforms is top-of-canopy (TOC) SIF (SIFtoc), which is not necessarily equal or proportional to total emitted SIF (SIFtot) from the entire canopy due to the (re)absorption and scattering effects. However, photosynthesis, the process that plants use to fix carbon from the atmosphere, occurs at the entire vertical canopy. Here, by using the recollision theory, we calculated SIFtot at 760 nm from the measured SIFtoc, hyperspectral reflectance (R), canopy interception (i) and leaf albedo (ωl). Among them, both SIFtoc and R can be obtained from concurrent TOC spectral measurements; i and ωl in the near-infrared region can be estimated from the open access datasets with a good accuracy. Our result confirms that the measured SIFtoc only accounts for a small fraction of SIFtot: the above-the-canopy sensor can only “see” on average 22.9% of SIFtot at Harvard Forest. SIFtot has the following advantages over SIFtoc in estimating GPP: (1) SIFtot improves the diurnal estimate of canopy GPP, especially capable to capture the midday depression of photosynthesis which may cause the large discrepancies between SIFtoc and GPP on a diurnal basis, (2) SIFtot produces a stronger correlation with GPP from plants with complex canopy structure or under sky conditions with more diffuse irradiance, and (3) the SIFtot-GPP relationship shows a stronger resilience to environmental stresses. The fluorescence escape ratio (fesc), the ratio between SIFtoc multiplied by π and SIFtot, is mostly determined by the sun-canopy-sensor geometry and leaf inclination distribution. The effect of LAI and the leaf chlorophyll concentration on fesc is marginal at the 760 nm wavelength. Our results suggest that converting SIFtoc into SIFtot provides a better tool to understand and estimate GPP.
Research Organization:
Marine Biological Laboratory, Woods Hole, MA (United States)
Sponsoring Organization:
MBL Lillie Research Innovation Award; National Natural Science Foundation of China; National Science Foundation; USDOE Office of Science (SC), Biological and Environmental Research (BER); University of Chicago
Grant/Contract Number:
SC0006951
OSTI ID:
1850972
Journal Information:
Remote Sensing of Environment, Journal Name: Remote Sensing of Environment Journal Issue: C Vol. 251; ISSN 0034-4257
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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