Photochemical reflectance ratio for tracking light use efficiency for sunlit leaves in two forest types.

The estimation of maximum carboxylation rate ( V cmax )—a critical determinant of the terrestrial carbon simulation—over space remains a challenging task. Inverting the V cmax through the sunlit gross primary productivity (GPP) is a possible solution if the key parameter sunlit light use efficiency ( ɛ sun ) could be acquired through remote sensing approaches. Previous studies have shown that the reflectance centered at 531 nm ( R 531 ) is very sensitive to variations of ɛ sun and the photochemical reflectance index ( PRI , the normalized difference index using R 531 and R 570 ) can be used as an indicator of ɛ sun at the leaf level though little is known about the PRI — ɛ sun relationship at the canopy level due to the mixing of sunlit and shaded leaves. In this study, the photochemical reflectance ratio ( PRR , defined as the ratio between R 531 and R 570 ) is proposed to enable the sunlit-shaded separation of the canopy reflectance observations acquired from a tower based multi-angular platform. The canopy PRR can be expressed as the algebraic sum of sunlit PRR and shaded PRR weighted by the visible portions of the sunlit canopy and the shaded canopy respectively. The visible portions from different angles were simulated using the 4-Scale model and the sunlit (/shaded) PRR was acquired through solving a set of equations describing the canopy PRR obtained from different angles. The relationships between the sunlit PRR ( PRR sun ) and ɛ sun were studied for a white pine stand (TP39) and a sugar maple stand (HA). At both sites, significant correlations between PRR sun and ɛ sun were obtained ( R 2 = 0.57 (TP39), 0.585 (HA), p < 0.001), showing the ability of PRR sun to track the variation of ɛ sun . Nevertheless, differences existed in the expressions of the PRR sun — ɛ sun relationship between TP39 and HA, a general expression could not be found. Further studies have shown that introducing the normalized difference vegetation index ( NDVI ) to correct PRR sun ( NDVI × PRR sun ) largely removed such differences, suggesting the potential of the NDVI corrected PRR sun in estimating the ɛ sun for different biomes. [ABSTRACT FROM AUTHOR]