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Diurnal Dynamics of Solar-induced Chlorophyll Fluorescence and Photosynthesis in a Maize Canopy
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  • Christine Chang,
  • Jiaming Wen,
  • Longlong Yu,
  • Cong Wang,
  • Jeff Melkonian,
  • Julie LeVonne,
  • Susan Riha,
  • Lianhong Gu,
  • Ying Sun
Christine Chang
Cornell University

Corresponding Author:cyc54@cornell.edu

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Jiaming Wen
Cornell University
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Longlong Yu
Cornell University
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Cong Wang
Cornell University
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Jeff Melkonian
Cornell University
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Julie LeVonne
Cornell University
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Susan Riha
Cornell University
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Lianhong Gu
Oak Ridge National Laboratory
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Ying Sun
Cornell University
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Abstract

Solar-induced chlorophyll fluorescence (SIF) offers a promising method to remotely monitor photosynthesis at the canopy and regional scale. However, in order to interpret satellite SIF measurements in a biological context, there needs to be a better understanding of the diurnal dynamics of SIF and photosynthesis under variable stress conditions. Photons absorbed by a leaf can enter photochemistry, be actively dissipated via non-photochemical quenching (NPQ), or be re-emitted as chlorophyll fluorescence. Therefore, having better understanding of NPQ should improve interpretation of SIF. At the canopy scale, we captured diurnal dynamics of SIF and GPP. We then coupled leaf-level measurements of chlorophyll fluorescence, NPQ and photosynthesis and plant water status with canopy-level SIF and GPP to explore the mechanisms controlling diurnal dynamics of fluorescence vs. photosynthesis in a rain-fed maize field situated in upstate New York.