Abstract:
10 evergreen plants were observed for the depostied atmospheric particle densities and micromorphology characteristics on their leaf surfaces. The results showed that their atmospheric particleretaining capabilities were different, and the highest unit area particles was P. asperata, followed by Cedrus deodara, Juniperus formosana, Pinus armandii, Sabina chinensis cv. kaizuca, Pinus tabulaeformis, Pinus bungeana, Sabina chinensis cv. pyramidalis, Platycladus orientalis and Euonymus japonicus. The original dustretaining status could be observed clearly by ESEM, but the micromorphology characteristics on the leaf surfaces of P. armandii and E. japonicus were covered by the heavy dust. The SEM observation results showed that there were apparent differences between the thoroughly rinsing and the unwashed samples, and the mock rainfall could greatly wipe off the atmospheric particles on the leaf surface. In general, there were certain relationship in the dustretaining capability of the leaf surface between the plant species and the leaf surface micromorphology characteristics.The microfeatures, such as embossment, grooves, stoma and texture increased the roughness of the leaf surface,which improved the particleretaining capabilities.