We report a novel relationship between seasonal photochemical reflectance index and sap flow in a mature conifer forest. The photochemical reflectance index responded to seasonal water and energy limitations due to its association with photoprotection. The photochemical reflectance index has remarkable potential as a proxy for forest functional response to seasonal ecohydrologic forcing.

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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, e2019JG005624. https://doi.org/10.1029/2019JG005624