赤外線湿度変動計を用いたスギ人工林の蒸発散量の測定

概要

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We estimated the diurnal trend in evapotranspiration from a Cryptomeria japonica D. DON. planted forest on flat topography using the eddy correlation method. Vertical components of wind speed, air temperature, and specific humidity were measured every 0.1 second using an ultrasonic anemometer-thermometer and an infrared hygrometer. The evapotranspiration rate and sensible heat fluxes were calculated using the eddy correlation method. Furthermore, to monitor the water flows through tree stems, the sap flow velocities were evaluated by the heat pulse velocity technique. We obtained the following results : (1) The ratio of the evapotranspiration to the net radiation ranged from 0.41 to 0.45. (2) The ratio of residual flux in the energy balance equation to the net radiation ranged from -0.038 to -0.031. (3) The beginning and end of the evapotranspiration were about 30 minutes later than those of the net radiation. The sap flow started even later than the evapotranspiration.
日本森林学会の論文
1992-03-01