Reductional effect of heat island in large-scale green space of Tokyo

Heat island effect has become a major issue in urban areas. Green space is expected to play a vital role in mitigating this effect. This study aims to investigate the effectiveness of different tree species for the mitigation of heat island effect, in large-scale urban green space. Each 9 tree species in Yoyogi park and 5 tree species in Meiji-Shinto shrine were selected and their canopy surface temperatures were measured by using infrared thennal images. At the results show that the canopy surlace temperature level would differ depend on each tree species. But such observed levels of canopy temperature differences were not sufficient to make a significant contribution for heat island mitigation. Further, even within the same species, canopy surface temperature varied across different locations within the same site. This difference depend on soil condition of the each location. Thus, this study result shows that the soil condition is influential more than the tree species