Effect of hydrophytes on the control of water temperature in model wetland type green roof garden

概要

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A wetland type green roof garden was constructed on the roof of Shimane University with wood and plastic sheets. The unit size was 1.5 m × 3 m × 0.2 m. The Maximum water depth was controlled to 10 cm. Four units were used in the experiment. Two had no vegetation, only keeping rain water. Hydrophytes were planted in one, and in another terrestrial plants in pots with zeolite were planted. Water temperature and depth were measured during the summer of 2003. Average evaporation rate was estimated by daily change of water depth of the no vegetation unit, it was 4.5mm d-1. The evapotranspiration rate in the unit with hydrophytes was 7.1 mm d-1, and the unit with terrestrial plants was 6.0 mm d-1. The daily maximum water temperatures in the no vegetation units were frequently over 40°C, however, in the unit with hydrophytes, it was controlled at about 30°C. The daily differences of the maximum and minimum water temperatures were also smaller in the unit with hydrophytes, in the range of 5-10°C, than the no vegetation unit, in the range of 15-20°C. Hydrophytes show high ability to control water temperature in a wetland type green roof garden.
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