Characteristics Of Atmospheric Dust And Its Effects On Soils In Different City Zones Of Nanjing

Soil quality is highly correlated with atmospheric environment quality, and airborne dust is the bridge of the soil and atmosphere environment. Therefore, it is of great significance to study the relationship between urban surface soil and atmospheric dust for urban environment, which may provide a basis for maintaining atmospheric environment quality and improving soil management. Six typical functional zones, namely as steel industry zone, industrial and residential mixed zone, road side, inner residential area, scenery site and suburb in Nanjing were selected for airborne dust collection, and collected surface soil by delaminating rounding the dust sample sites. The deposition flux, composition, source and change of properties of surrounding soils after dust deposition were studied, in order to reveal the long-term effects of atmospheric dust on the formation and evolution of the soil and to provide scientific evidence for land use and environment protection in this area. The major results and conclusions of this study are as follows:1. The results showed that deposition flux varied between 3.39～65.95 g / (m~2·month) in the study period, depending on different zones. Dust flux in steel industry zone was significantly higher than all other sites, indicating that local contribution exceeded that of regional background deposition.2. The number-size distribution in deposition exhibited a unimodal pattern with the peak at 0.05-0.20μm. However, the volume-size distribution of industry zone, with a higher peak at 10-50μm and a lower peak at 100-500μm, both for the industrial and residential mixed zones. Other zones displayed unimodal pattern with the peak at 10-50μm. We found that the natural airborne dust in urban area reflects the atmospheric particle background characteristics of the deposition areas and the influence of dust event, as shown by the...