Broadband simple ratio closely traced seasonal trajectory of canopy photosynthetic capacity

Details Broadband simple ratio closely traced seasonal trajectory of canopy photosynthetic capacity Broadband simple ratio closely traced seasonal trajectory of canopy photosynthetic capacity

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3507401w&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 7, CiteID L07401

Mathematics

Logic

2

Global Change: Instruments And Techniques, Global Change: Remote Sensing (1855), Biogeosciences: Carbon Cycling (4806), Biogeosciences: Biosignatures And Proxies, Biogeosciences: Biosphere/Atmosphere Interactions (0315)

Scientific paper

In this study, we investigated the relationship between meteorological-based broadband simple ratio (SR) and canopy photosynthetic capacity (maximum carboxylation rate normalized to 25°C, V c,25) in three Fagus crenata stands in the cold-temperate zone of Japan. Broadband SR was calculated from recorded up- and down-looking photosynthetically active radiation (PAR) and global radiation (GR) data. The study reveals that broadband SR seasonal courses closely follow V c,25 seasonal trajectories, with a statistically significant linear regression relationship between the two. Linear regression models show that R2 ranges from 0.59 (for 550 m site) to 0.91 (for 1500 m site), but eventually drops to 0.37 when all data pool together. Despite variations in R2 for the different sites, the relationship remains statistically significant (P < 0.000). Though spatially limited, broadband SR can serve as an easy but robust indicator of seasonal variations in V c,25 required for accurate carbon fixation simulations in gas exchange models.

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