Diurnal variation

VOC emissions depend on the stomata conductance and reflected radiation which will reached the leaf surface since it regulates gross primary production of plants through CO2 uptake. This leads to the diurnal variation of VOC emissions. Monoterpenes can be stored in leaves without specific storage tissues. These storages of volatile organic compound emissions are connected to the volatility of certain compounds.

 

The volatility of certain compounds depends of stomata conductance (linalool ja 1,8-cineole), and for certain monoterpenes similar impact has not been discovered (limonene ja β-ocimetene). Also with methanol, emission peaks have been discovered when leaves will get light after the dark period, which means that these storages are released when stomata conductance is high enough. It is also possible, that part of the diurnal variation has not been discovered since emissions are relatively small. Adaption rate is usually fast when these storages are small (α-pinene and isopreeni). Return to the previous state shows if emissions of certain elements depends on conductivity of different compounds. Fast recovery points out that these elements were released from tissues based on compound productivity.