The efficiency-level inconsistency of the SIF–GPP relationship in a subtropical evergreen forest in Okinawa, Japan

Key Points

• Inconsistencies in the SIF–GPP relationship highlight challenges in measuring photosynthetic efficiency and understanding forest dynamics.
• Findings indicate significant variations in light use efficiency metrics during different seasonal periods, affecting overall productivity.
• Analysis utilizes remote sensing data to explore the relationship between solar-induced fluorescence (SIF) and gross primary productivity (GPP).
• This study may prompt new methods for evaluating forest health and functioning; further research is necessary to clarify these dynamics.