Changes between Version 3 and Version 4 of DevelopmentActivities/Photosynthesis
- Timestamp:
- 2013-07-04T17:33:09+02:00 (11 years ago)
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DevelopmentActivities/Photosynthesis
v3 v4 21 21 C3 photosynthetic rates (the FvCB model), Yin et al. propose an analytical algorithm that incorporates a gs model and uses gm as a temperature-dependent parameter for calculating Assimilation based on the FvCB model for various environmental scenarios. Yin et al. also propose a C4-equivalent version of the FvCB model and an associated analytical algorithm for this model. They believe that applying FvCB-type models to both C3 and C4 crops is recommended to accurately predict the response of crop photosynthesis to multiple, interactive environmental variables. 22 22 Many of the photosynthetic parameters and conductances used in their modeling scheme are defined with the following equations, which is an modified Arrhenius function: 23 23 24 {{{ 24 25 #!formula … … 27 28 \[ 28 29 \begin{array}{lcl} 29 \displaystyle \sum_{jv= 3,nvm} \sum_{jst=1,nstm}\frac {corr\_veg\_soil(jv,jst)}{veget\_max(jv)} &=& 2\,vegtot \\30 \displaystyle \sum_{jv=1,nvm} \sum_{jst=1,nstm}\frac {corr\_veg\_soil(jv,jst)}{veget\_max(jv)} &=& 2\,vegtot \\ 30 31 &=& 2 \times vegtot 31 32 \end{array} 32 33 \] 33 34 }}} 35 34 36 == Temperature Acclimation of Photosynthetic parameters == 35 37 Based on a reanalysis of data from 36 species, Kattge and Knorr propose a parametrization where Jmax and Vcmax at 25°C are defined jointly thanks to a Jmax:Vcmax ratio. Based on their analysis, they found that