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On the Functional Relationship Between Fluorescence and Photochemical Yields in Complex Evergreen Needleleaf Canopies

Maguire, Andrew J. and Eitel, Jan U. H. and Griffin, Kevin L. and Magney, Troy S. and Long, Ryan A. and Vierling, Lee A. and Schmiege, Stephanie C. and Jennewein, Jyoti S. and Weygint, William A. and Boelman, Natalie T. and Bruner, Sarah G. (2020) On the Functional Relationship Between Fluorescence and Photochemical Yields in Complex Evergreen Needleleaf Canopies. Geophysical Research Letters, 47 (9). Art. No. e2020GL087858. ISSN 0094-8276.

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Recent advancements in understanding remotely sensed solar‐induced chlorophyll fluorescence often suggest a linear relationship with gross primary productivity at large spatial scales. However, the quantum yields of fluorescence and photochemistry are not linearly related, and this relationship is largely driven by irradiance. This raises questions about the mechanistic basis of observed linearity from complex canopies that experience heterogeneous irradiance regimes at subcanopy scales. We present empirical data from two evergreen forest sites that demonstrate a nonlinear relationship between needle‐scale observations of steady‐state fluorescence yield and photochemical yield under ambient irradiance. We show that accounting for subcanopy and diurnal patterns of irradiance can help identify the physiological constraints on needle‐scale fluorescence at 70–80% accuracy. Our findings are placed in the context of how solar‐induced chlorophyll fluorescence observations from spaceborne sensors relate to diurnal variation in canopy‐scale physiology.

Item Type:Article
Related URLs:
URLURL TypeDescription
Maguire, Andrew J.0000-0002-6334-0497
Griffin, Kevin L.0000-0003-4124-3757
Magney, Troy S.0000-0002-9033-0024
Schmiege, Stephanie C.0000-0001-9054-5538
Additional Information:© 2020 American Geophysical Union. Received 6 MAR 2020; Accepted 17 APR 2020; Accepted article online 23 APR 2020. This research was supported by NASA FINESST Grant 80NSSC19K1341 to A. J. M.; NASA ABoVE Grant NNX15AT86A to J. U. H. E., L. A. V., N. T. B., and K. L. G.; and USDA McIntire‐Stennis Grant 1018044 to J. U. H. E. We thank the Nokes family for granting us access to the Herald Nokes Family Experimental Forest. We also thank Carlos A. Silva for contributions in processing the airborne lidar data. Algorithms for interpolating DSMs were adapted from programs written by Heather E. Greaves (Greaves et al., 2015, 2016). We thank Johanna E. Jensen for valuable discussions through this project. Fluorescence and irradiance data used in this research may be accessed from the Oak Ridge National Laboratory Distributed Active Archive Center (Maguire et al., 2020).
Funding AgencyGrant Number
Department of Agriculture1018044
Subject Keywords:canopy irradiance; evergreen needleleaf forest; light use efficiency; nonphotochemical quenching
Issue or Number:9
Record Number:CaltechAUTHORS:20200423-134746132
Persistent URL:
Official Citation:Maguire, A. J., Eitel, J. U. H., Griffin, K. L., Magney, T. S., Long, R. A., Vierling, L. A., et al. (2020). On the functional relationship between fluorescence and photochemical yields in complex evergreen needleleaf canopies. Geophysical Research Letters, 47. e2020GL087858.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:102755
Deposited By: Tony Diaz
Deposited On:23 Apr 2020 20:55
Last Modified:05 May 2020 19:46

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