Many of urban people are spending architectural space about 80∼90% of the residence and starting work, and securing health of the space is an important theme. In this study, the effect of the stress relaxation in indoor space by mini pot plants was verified. The respondent to a survey was a participant, and it stayed in the classroom with the coexistence feeling. And the stress situations of each stage were compared by ① setting of the plant is not arranged, ② forward with plant arrangement, ③ plant arrangement by each tables. POMS was diagnosed as a psychology index. The saliva amylase was inspected as a physiology index. It did excellently to the impression of the space the existence of the plant, and a positive evaluation was obtained according to the SD investigation. The arrangement of the plant has eased the stress according to the POMS diagnosis. Especially, the psychological effect when the plant was put on the table was large, and the attachment feeling to the plant was admitted.
To decontaminate the radioactive substance from the lawn, we measured the value of radiation dose of turfgrass and ground in a house yard at Fukushima city, Fukushima pref. The thatch especially showed high value of radiation dose, suggesting radioactive substance abundantly adsorbs to the thatch. On the other hand, soil under the thatch was at low dose level. By removing the thatch, surface contamination value drastically decreased to about 93%. After four weeks, the turf grew new shoots well and covered all area. At some contaminated playgrounds, turf grass was removed with surface soil for clean up, however, our method appeared useful for reducing radioactive substance and turf recovery.