This study recorded air, top soil layers and streamflow temperatures at the Lienhuachih No. 3 experimental
watershed of the Lienhuachih Experimental Forest of the Taiwan Forestry Research Institute (TFRI) from 2009 to 2012. The results show that the average yearly temperatures for air, streamflow, the 5cm soil layer, 30cm soil layer and 50cm soil layer during the monitoring period were: 19.9, 19.2, 20.3, 20.5 and 20.8℃, respectively. The yearly temperature changes were significant for all monitoring items and ranked in the following order: air, the 5 cm
soil layer, 30 cm soil layer, 50 cm soil layer and streamflow. Air temperature had the maximum magnitude of changes within a day for all months, followed by the 5 cm top soil layer. However the maximum magnitudes of daily
changes were less than 0.3℃ for soil layers deeper than 50 cm. The linear regression relationships of air temperature
versus streamflow temperature and air temperature versus the temperature of the 5 cm top soil layer were also established
in this report.
Key Words : Streamflow temperature, top soil temperature, air temperature, Lienhuachih experimental watersheds.