Non-linearity between gross primary productivity and far-red solar-induced chlorophyll fluorescence emitted from canopies of major biomes

Solar-induced chlorophyll fluorescence (SIF) observed from vegetation has been considered as a promising proxy of gross primary productivity (GPP) in several studies, and recent work has shown advantages of using the total emitted SIF (SIFtotal) to capture the variation of GPP. The non-linearity between SIF and GPP at the canopy level was often observed in many previous studies, but the non-linearity between SIFtotal and GPP has not yet been …