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    The Photochemical Reflectance Index (PRI) Captures the Ecohydrologic Sensitivity of a Semiarid Mixed Conifer Forest

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    2019JG005624.pdf
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    Author
    Yang, Julia C.
    Magney, Troy S.
    Yan, Dong
    Knowles, John F.
    Smith, William K.
    Scott, Russell L.
    Barron‐Gafford, Greg A.
    Affiliation
    School of Geography and Development, University of Arizona
    School of Natural Resources and the Environment, University of Arizona
    Issue Date
    2020-10-27
    Keywords
    eddy covariance flux
    evergreen
    leaf gas exchange
    photoprotection
    proximal remote sensing
    sap flow
    
    Metadata
    Show full item record
    Publisher
    Blackwell Publishing Ltd
    Citation
    Yang, J. C., Magney, T. S., Yan, D., Knowles, J. F., Smith, W. K., Scott, R. L., & Barron‐Gafford, G. A. (2020). The photochemical reflectance index (PRI) captures the ecohydrologic sensitivity of a semiarid mixed conifer forest. Journal of Geophysical Research: Biogeosciences, 125(11), e2019JG005624.
    Journal
    Journal of Geophysical Research: Biogeosciences
    Rights
    © 2020. American Geophysical Union. All Rights Reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    At the seasonal time scale, daily photochemical reflectance index (PRI) measurements track changes in photoprotective pigment pools as plants respond to seasonally variable environmental conditions. As such, remotely sensed PRI products present opportunities to study seasonal processes in evergreen conifer forests, where complex vegetation dynamics are difficult to capture due to small annual changes in chlorophyll content or leaf structure. Because PRI is tied explicitly to short- and long-term changes in photoprotective pigments that are responsible for regulating stress, we hypothesize that PRI by extension could serve as a proxy for stomatal response to seasonally changing hydroclimate, assuming plant functional responses to stress covary in space and time. To test this, we characterized PRI in a semiarid, montane mixed conifer forest in the Madrean sky islands of Arizona, USA, during the monsoon growing season subject to precipitation pulse dynamics. To determine the sensitivity of PRI to ecohydrologic variability and associated changes in gross primary productivity (GPP), canopy spectral measurements were coupled with eddy covariance CO2 flux and sap flow measurements. Seasonally, there was a significant relationship between PRI and sap flow velocity (R2 = 0.56), and multiple linear regression analysis demonstrated a PRI response to dynamic water and energy limitations in this system. We conclude that PRI has potential to serve as a proxy for forest functional response to seasonal ecohydrologic forcing. The coordination between photoprotective pigments and seasonal stomatal regulation demonstrated here could aid characterization of vegetation response to future changes in hydroclimate at increasing spatial scales. ©2020. American Geophysical Union. All Rights Reserved.
    Note
    6 month embargo; first published online 27 October 2020
    ISSN
    2169-8953
    EISSN
    2169-8961
    DOI
    10.1029/2019jg005624
    Version
    Final published version
    Sponsors
    National Science Foundation
    ae974a485f413a2113503eed53cd6c53
    10.1029/2019jg005624
    Scopus Count
    Collections
    UA Faculty Publications

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