Airborne dust detainment by different plant leaves: Taking Beijing as an example

In order to research the dust detaining capability and its rules of different plant leaves,some representative greenery species in Beijing were chosen to systematically study the dust accumulation on the leaves of different plants in open and close surroundings by direct sampling and measurement,and statistical analysis as well.The results showed that:1) the dust detaining amount per square meter of leaves varied significantly at large caused by the strong disturbance of external environment;2) for the same species,dust detained on the leaves in the close surroundings was obviously less than that in the open ones,illustrating that the dust detaining amount of leaves increased with the increment of particles in the environment;3) in the open surroundings,the dust detaining amount of leaves at the lower parts of plants was evidently larger than that of the ‘middle’ and ‘higher’ parts of the same plant according to the comparison of dust detaining of different leaves vertically in the same plant,because,the dust that had landed down to the road was churned up by cars and people,and dropped down to the leaves at the lower part of plants again;4) the cumulative dust detained on different plant leaves within one day period showed no linear relation with time,implying that the dust detaining process was complicated and dynamic.The leaves detain the dust and shake-out of it simultaneously.Understanding the dust detaining capability and its rules of different plant leaves systematically can be of guidance to urban landscaping.