한국에 자생하는 나무종류에 따른 입자 농도 수의 침착특성 분석

Abstract

The use of trees is often regarded an effective way in controlling air pollution. Though most research involved epidemiological and site experimental studies, very little research focused on quantifying its effects particularly in lowering particulate concentration. This study aims to analyze the effect of trees in the decay of particle concentration in the environment. An experimental chamber setup was devised in order to determine the deposition of aerosol in tree species found in Korea. Decay loss rate (β, 1/sec) is obtained based on the effects of leaf surface area and particle diameter. To relate its effect with particles in the PM2.5 range, ultrafine NaCl particles (dp<100 nm) were used as particle source for this study. Tests were performed for tree specimens of pinus densiflora (소나무), for needle type species, and Platanus occidentali, (플라타너스), for broad / flat type species. Based from the results, further increasing the surface area of the tree specimen yielded a higher loss rate. Smaller particles in the ultrafine range (dp<100 nm) generated a faster loss rate. Also, the complex structure of tree species such as pine trees helps increase the rate of decay compared with species with flat leaves such as Platanus. This study is beneficial for urban tree planning and PM control in terms of presenting on which species in suitable in lowering the particulate matter in a specific area.