When radiation hits canopies its energy is partitioned among the leaves. Dealing with this complexity was faced since the studies by Monsi and Saeki, 1953 and summarised in Goudriaan, 1977 and Hirose, 2004. In the note at the link, there is a brief description of the Sun-Shade model by de Pury and Farquard, 1997 which assume that leaves are divided into 2 compartments, the leaves under sunlit and the leaves in shades. The Authors claim that this simplified model does not imply great errors in estimation of canopy radiation with respect to more complicate and computationally expensive models.
References
- de Pury, D.G.G., “SCALING PHOTOSYNTHESIS AND WATER USE FROM LEAVES TO PAD- 81 DOCKS”. PhD thesis. The-Australian National University _, Nov. 1995. 82
- Pury, D. G. G. de, and G. D. Farquhar. 1997. “Simple Scaling of Photosynthesis from Leaves to Canopies without the Errors of Big-Leaf Models.” Plant, Cell & Environment 20 (5): 537–57. https://doi.org/10.1111/j.1365-3040.1997.00094.x.
- M Monsi and T Saeki. “The light factor in plant communities and its significance for dry matter 83 production”. In: Japanese Journal of Botany (1953). 84
- J Goudriaan. Crop Micrometeorology: A Simulation Study. en. Wageningen: Pudoc, Center for 85 Agricultural Publishing and Documentation, 1977. 86
- Tadaki Hirose. “Development of the Monsi–Saeki Theory on Canopy Structure and Function”. 87 en. In: Ann. Bot. 95.3 (Dec. 2004), pp. 483–494. 88
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