In Ficus elastica, the nondestructive measurements of the variations in stem diameter and the transpiration are done for analyzing a water movement, temperature and relative humidity being parameters. The model to explain the water movement is described by using Soil-Plant-Atmosphere-Continuum (SPAC) concept. By fitting the calculated values to the measurements, the optimum coefficients of the model (SPAC coefficients) are determined. The SPAC coefficients are used as the indicators of the dependency of the environmental conditions. The measurements show reproducibility and are fit by the calculated values. Therefore, the SPAC coefficients are estimated appropriately under various environmental conditions. It is note that the higher temperature, the larger the water capacity of stem, and the smaller the water resistances of soil, root and stem; the plant tends to reservoir water at high temperature.
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