Abstract
System identification of “plant-water” is examined by spectrum analysis, where the relationship between the input of light or relative humidity and the output of leaf temperature or water content in stem are obtained by computing frequency function or weighting function.
Furthermore to prove the method, the step re-sponse of leaf temperature and water content in stem are obtained by computing the convolution integral of both weighting function and the step input of light. Especially, the response of leaf temperature obtained by the present system identification is closely related to that actually observed, which is found to be valid on the examination of coherency.
On these findings, optimal control of water dificit and photosynthesis might be realized by monitoring leaf temperature.
