Salt spray damages on urban trees caused by two typhoons in 2011 and 2018 in Tokyo Bay area in Chiba city

Abstract

Salt spray damage on street and park trees was observed after passing of strong typhoons in 2011 and 2018 in Tokyo-Bay area of Chiba city. Damage level was classified into 4 categories by eye, and the relationship between damage level in each tree species and the distance from the shoreline was analyzed. No dead tree was found, but many trees showed necrosis of leaves at the sea-side of the crown. Damage in deciduous trees was more prominent than evergreen trees, except evergreen Ligustrum lucidum and Cinnamomum camphora showing heavy damage in the both years. Difference in damage among tree species was greater than that among sites with different distance from shoreline. Although the damage levels in 2018 was heavier than those in 2011, they showed the same trend among species reflecting species’ tolerance to salt-spray.