where f depends on properties of the plant (inside pressure, opening of sto-mata, etc.), as well as on the CO2 eddy diffusion parameter in the air surrounding the plant. The atmospheric concentration, Xatm, decreases with height when no photosynthesis takes place (night condition), as shown for example in Fig. 2.29. However, during daytime in low wind conditions, the CO2 concentration exhibits a minimum halfway through the canopy of vegetation (Saeki, 1975).
If the proportionality factor between production P and CO2 internal concentration X is g, when no other limiting factors are encountered, then the rate of primary production as function of incident radiation, E+, may be written
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Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.