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.

Check it out here! https://doi.org/10.1029/2019JG005624