Abstract
The phenomenon of transpiration and latent heat release in stomata of plants is important in relation to the water resources, the suppression of CO2 increase and global warming. Hitherto, the phenomenon is treated by either the Penman-Monteith theory and stomatal conductance or the bulk formula.In this paper, the writer proposes two theories from a standpoint of hydraulics. One is a 1D model of a hydraulic system of water-uptake from roots to stomata of leaves, considering the osmatic pressure change resulting from transpiration and photosynthesis. The other is the numerical computation of flow, heat and energy, CO2 and vapour around leaf surface, and in stomata and leaf cells. The theoretical computation explains the micro-mechanisms of transpiration, latent heat release, CO2 assimilation, and would further give a foundation for the conventionally used formulae.
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