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Tracking Seasonal and Interannual Variability in Photosynthetic Downregulation in Response to Water Stress at a Temperate Deciduous Forest

He, Liyin and Wood, Jeffrey D. and Sun, Ying and Magney, Troy and Dutta, Debsunder and Köhler, Philipp and Zhang, Yongguang and Yin, Yi and Frankenberg, Christian (2020) Tracking Seasonal and Interannual Variability in Photosynthetic Downregulation in Response to Water Stress at a Temperate Deciduous Forest. Journal of Geophysical Research: Biogeosciences, 125 (8). Art. No. e2018JG005002. ISSN 2169-8953. https://resolver.caltech.edu/CaltechAUTHORS:20200819-074812139

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Abstract

The understanding and modeling of photosynthetic dynamics affected by climate variability can be highly uncertain. In this paper, we examined a well‐characterized eddy covariance site in a drought‐prone temperate deciduous broadleaf forest combining tower measurements and satellite observations. We find that an increase in spring temperature usually leads to enhanced spring gross primary production (GPP), but a GPP reduction in late growing season due to water limitation. We evaluated how well a coupled fluorescence‐photosynthesis model (SCOPE) and satellite data sets track the interannual and seasonal variations of tower GPP from 2007 to 2016. In SCOPE, a simple stress factor scaling of Vcmax as a linear function of observed predawn leaf water potential (ψ_(pd)) shows a good agreement between modeled and measured interannual variations in both GPP and solar‐induced chlorophyll fluorescence (SIF) from the Global Ozone Monitoring Experiment‐2 (GOME‐2). The modeled and satellite‐observed changes in SIF_(yield) are ~30% smaller than corresponding changes in light use efficiency (LUE) under severe stress, for which a common linear SIF to GPP scaling would underestimate the stress reduction in GPP. Overall, GOME‐2 SIF tracks interannual tower GPP variations better than satellite vegetations indices (VIs) representing canopy “greenness.” However, it is still challenging to attribute observed SIF variations unequivocally to greenness or physiological changes due to large GOME‐2 footprint. Higher‐resolution SIF data sets (e.g., TROPOMI) already show the potential to well capture the downregulation of late‐season GPP and could pave the way to better disentangle canopy structural and physiological changes in the future.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1029/2018jg005002DOIArticle
ORCID:
AuthorORCID
He, Liyin0000-0003-4427-1438
Wood, Jeffrey D.0000-0001-6422-2882
Sun, Ying0000-0002-9819-1241
Magney, Troy0000-0002-9033-0024
Dutta, Debsunder0000-0001-5727-1045
Köhler, Philipp0000-0002-7820-1318
Zhang, Yongguang0000-0001-8286-300X
Yin, Yi0000-0003-4750-4997
Frankenberg, Christian0000-0002-0546-5857
Additional Information:© 2020 American Geophysical Union. Issue Online: 07 August 2020; Version of Record online: 07 August 2020; Accepted manuscript online: 28 July 2020; Manuscript accepted: 13 July 2020; Manuscript revised: 12 May 2020; Manuscript received: 30 December 2018. Y. Z. is supported by International Cooperation and Exchange Programs between NSFC and DFG (41761134082). J. D. W. acknowledges support for the MOFLUX site from the U.S. Department of Energy, Office of Science, Office of Biological and Environmental Research Program, through Oak Ridge National Laboratory's Terrestrial Ecosystem Science – Science Focus Area; ORNL is managed by UT‐Battelle, LLC, for the U.S. DOE under Contract DE‐AC05‐00OR2272. Y. S. acknowledge the USDA‐NIFA Hatch Project Award 1014740, the Cornell Initiative for Digital Agriculture Research Innovation Fund, the NASA Earth Science Division MEaSUREs program, and the NSF MacroSystem Biology (1926488). Data Availability Statement: The GOME‐2 SIF product is publicly available (on ftp://fluo.gps.caltech.edu/data/Philipp/GOME-2/). The predawn leaf water potential data at the MOFLUX site are obtained online (from https://tes-sfa.ornl.gov/node/80). Flux data used in the paper are available in the AmeriFlux database (https://ameriflux.lbl.gov) before 2016, and flux data in 2016 are provided by Dr. Jeffrey D. Wood in University of Missouri, which will eventually be available through the AmeriFlux portal. All the MODIS products are obtained from Google Earth Engine (https://developers.google.com/earth-engine/datasets/catalog/modis). GOSIF data are available online (at http://globalecology.unh.edu/data/GOSIF.html). TROPOMI SIF can be downloaded online (from ftp://fluo.gps.caltech.edu/data/tropomi).
Funders:
Funding AgencyGrant Number
National Natural Science Foundation of China41761134082
Deutsche Forschungsgemeinschaft (DFG)UNSPECIFIED
Department of Energy (DOE)DE‐AC05‐00OR2272
Department of Agriculture1014740
Cornell UniversityUNSPECIFIED
NASAUNSPECIFIED
NSFDEB-1926488
Subject Keywords:solar‐induced fluorescence; vegetation indices; drought monitoring; fluorescence yield; photosynthesis
Issue or Number:8
Record Number:CaltechAUTHORS:20200819-074812139
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200819-074812139
Official Citation:He, L., Wood, J. D., Sun, Y., Magney, T., Dutta, D., & Köhler, P., et al. (2020). Tracking seasonal and interannual variability in photosynthetic downregulation in response to water stress at a temperate deciduous forest. Journal of Geophysical Research: Biogeosciences, 125, e2018JG005002. https://doi.org/10.1029/2018JG005002
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105019
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:19 Aug 2020 15:56
Last Modified:19 Aug 2020 15:56

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