Abstract:Soil quality evaluation is an effective way to study present condition of soil pollution and to perfect management system. This paper aims to study the impact of major pollutants of soil quality and analyze the impact of soil on groundwater. Taking Dawu water source in Zibo city as the study area, by using comprehensive analysis and comparison methods, the situation of soil improvement in the past ten years have been analyzed, and the relationship between soil and groundwater has been explored. It is showed that the overall soil quality in the study area is good, there is no high pollution risk Ⅲ type of soil, and main soil is the low pollution risk of Ⅰ type. The Ⅱ quality soil with controllable risk is mainly distributed in the topmost layer, and the vertical pollutants migrate downward. The soil heavy metal is mainly Hg, Cd and Pb, with consistency and homology. The most serious organic pollution is polycyclic aromatic hydrocarbons, followed by dichloromethane, which mainly comes from the waste water discharged by the surrounding chemical plants. In this investigation, the concentration of benzene has been greatly reduced, and the heavy metal Cd pollution has increased without being detected. The downward migration of pollutants in the soil has affected the quality of groundwater. The quality of groundwater and soil have improved in the past 10 years, however, the pollutants in the soil of Dawu water source still have a continuous impact on the quality of groundwater. This study is significant to the classification and definition of soil quality in Dawu water source area in Zibo city, and to improve the ecological health of water and soil.
