抄録
By measuring soil temperature in summer and in winter at the depth of 50 cm and of 100 cm in the 28-by-8 area that covers both the urban area and the suburban area (95 measuring spots in the whole area), the study makes it clear that the soil temperature difference between the urban area and the suburban area is considerable in summer rather than in winter whereas the Heat Island Phenomenon is more noticeable in winter than in summer. Also, we have observed that the thermal diffusivity of soil is higher in the urban area than in the suburban area.
