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RemkoDuursma / plantecophys

Analysing and Modelling Leaf Gas Exchange Data in R
http://remkoduursma.github.io/plantecophys
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Photorespiration in R plantecophys #1

Open tyeentaylor opened 3 years ago

tyeentaylor commented 3 years ago

Hi Remko,

I'm exploring a question about photorespiration, and I'm trying to figure out how it's accounted for in plantecophys. I can see that the Ci-dependent relative reaction affinity of Rubisco for C vs. O is reflected in Km, and the compensation point with GammaStar. But I can't see any specific accounting for the CO2 released during photorespiration.

Is Ac actually the balance of Vc and photorespiration? Thus, for Vcmax limited A:

Ac = Vc - 0.5*Vo Anet = Ac - Rd

Is that right? And does the CO2 released from photorespiration contribute to the estimate of Ci?

Thanks very much for any clarifications.

Ty

RemkoDuursma commented 3 years ago

Hi Ty, yes that is correct. Photorespiration is accounted for in the model implemented in Photosyn and fitaci. The model of Farquhar et al (1980) accounts for it (https://link.springer.com/article/10.1007/BF00386231).