抄録
For an investigation of the degeneration of forest by the air pollution using the satellite remote sens-ing data, it is necessary to confirm by ground truth whether spectral refrectance characteristics of trees are available to indicate damages by air pollution. In this study, the amount of sulfur oxide deposited on leaves and the spectral reflectance chalacteristics of the near infrared band (NIR) and the red band (R) in spectral region of leaves of the trees in the environs of cities and factories were measured. The vegetation activity is defined as the bi-band ratio (NIR/R), and this paper discussed the relationship between (NIR/R) value and the amount of sulfur oxide deposited on leaves in accordance with the pollution level. The conclusions of this paper are as follows.
(1) The more the distance from the source of air pollution increases, the more the amount of sulfur oxide diposited on leaves decreases being irrelevant to the environmental condition.
(2) In the case of equivalent growth condition, (NIR/R) values of trees become bigger as the distance from the source of air pollution increases.
(3) In the case of different growth condition, (NIR/R) values of trees are various being irrelevant to the distance from the source of air pollution.
(4) There is a negative correlation (coefficient of correction=-0.968) between the amount of sulfur oxide deposited on leaves and (NIR/R) values.
