Remote sensing of photosynthetic light-use efficiency across two forested biomes: Spatial scaling

Hilker, Thomas, Hall, Forrest G., Coops, Nicholas C., Lyapustin, Alexei, Wang, Yujie, Nesic, Zoran, Grant, Nick, Black, T. Andrew, Wulder, Michael A., Kljun, Natascha, Hopkinson, Chris and Chasmer, Laura (2010) Remote sensing of photosynthetic light-use efficiency across two forested biomes: Spatial scaling. Remote Sensing of Environment, 114 (12), 2863-2874. (doi:10.1016/j.rse.2010.07.004).

Abstract

Eddy covariance (EC) measurements have greatly advanced our knowledge of carbon exchange in terrestrial ecosystems. However, appropriate techniques are required to upscale these spatially discrete findings globally. Satellite remote sensing provides unique opportunities in this respect, but remote sensing of the photosynthetic light-use efficiency ($\epsilon$), one of the key components of Gross Primary Production, is challenging. Some progress has been made in recent years using the photochemical reflectance index, a narrow waveband index centered at 531 and 570nm. The high sensitivity of this index to various extraneous effects such as canopy structure, and the view observer geometry has so far prevented its use at landscape and global scales. One critical aspect of upscaling PRI is the development of generic algorithms to account for structural differences in vegetation. Building on previous work, this study compares the differences in the PRI: É? relationship between a coastal Douglas-fir forest located on Vancouver Island, British Columbia, and a mature Aspen stand located in central Saskatchewan, Canada. Using continuous, tower-based observations acquired from an automated multi-angular spectro-radiometer (AMSPEC II) installed at each site, we demonstrate that PRI can be used to measure

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