Dust detaining effect of main urban vegetation in Yongchuan,Chongqing
永川城区主要绿化植物的滞尘效应

Some representative greenery species in Yongchuan were chosen to study the dust accumulation of unit area on the leaves of different plants in representative sites by direct measurement, and statistical analysis as well. The results showed that there were great differences in the dust accumulation capability of different test greenery species, L.chindensevar>Ophiopogon Japonicus>F.microcarpa>Photinia.s>Osmanthus fragrans>Camellia japonica>Ligustrum lucidum>Fatsia japonica>m.grandiflora>Pittosporum tobira>Michelia alba>Ilex purpurea Hassk>ginkgo>J. nudiflorum Lindl, from 2.0903 g/m2(J. nudiflorum Lindl) to 12.361 g/m2(L.chindensevar),with the maximum being 6 times more than the minimum. There are great differences in the dust accumulation capability of the same test greenery species in different urban areas, following the trend according to landuse the commercial and transport area microscopic scanning showed that different greenery species which had different leaf epidermal micro-configuration had different dust-retainning capability, the leaves had tomentum or evident>newly developing urban>the residential area>control area. The results of leaf surface electron ridge like rumple, their dust-retaining capability are stonger, the leaves have smooth or ceraceous surfaces, their dust-retaining capability are poor. The dust-retaining capability is bound up with the eare of unit leaf.