| Summary: | 碩士 === 國立屏東科技大學 === 水土保持系所 === 97 === This study was mainly aimed microclimate properties of the thorny bamboo plantation in the southwestern Taiwan. All the micrometeorological observations include as global solar radiation, net radiation, wind speed, wind direction, air temperature, relative humidity and soil heat flux were observed at the 27 m height from November 2005 to June 2008, and then the evapotranspiration of the thorny bamboo plantation could be estimated by heat budget and Bowen ratio.
The results had shown: the air temperature and relative humidity above the canopy was 13.8~30.6 ℃and 49.4~93.3 %, in the case under the canopy was 14.6~31.6 ℃ and 57.2 ~ 99.5 % in thorny bamboo plantation. The comparison of daily mean absolute humidity for the various seasons were known as Summer（28.0~32.1, 30.2）, Spring（16.0~31.0, 23.5）, Autumn（13.4~24.6，19.0）, and Winter（15.3~31.0，23.1）g m-3 respectively. The ratio of net radiation above the canopy and the global solar radiation was 0.62, and were heat flux was absorbed by the canopy of thorny bamboo plantation, then it was helpful for the grow up tendency.
The wind speed under canopy of thorny bamboo plantation was decreased by the canopy and the mean was lower than 1.5 m s-1 wind speed. The estimate the evaportranspiration of the thorny bamboo plantation by the heat budget method in the southwestern Taiwan was positively correlated to evaporation, and the daily mean evaportranspiration for Summer, Spring, Winter, and Autumn seasons were about to 2.31 mm, 4.97 mm, 2.17 mm and 1.26 mm, respectively.
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