四川邛海滨湖公路路面径流污染及其生态风险研究

Research on Runoff Pollution and Its Potential Ecological Risk in Qionghai Lakeside Road in Sichuan

通过在雨季和旱季各2次典型降雨期间对邛海滨湖公路路面径流连续采样监测,结果表明,该路面径流的主要污染因子为SS、COD、TP、TN和Pb,旱季的径流污染程度较雨季重,主干路的路面径流污染最严重。因子分析表明,路面径流的主要污染因子为重金属和营养盐,其方差贡献率分别为64. 546%和13. 596%。潜在生态风险评估表明,路面径流中重金属平均潜在生态风险处于轻微级别,6种重金属中除Pb在主干路达到中等风险外,其余均为轻微风险。

Based on water quality monitoring in Qionghai Lakeside road runoff from 2 typical rains in rainy and dry season each, the result showed that the major pollutants were suspended solids（SS）, chemical oxygen demand（COD）, total phosphorus（TP）, total nitrogen（TN） and lead（Pb）. Meanwhile the pollution in dry season was more serious than that in rainy season, and the pollution from the main road runoff was the most serious. Based on factor analysis, the major pollution factors were heavy metals and nutrients, whose variance contribution rate were 64.546% and 13.596%, separately. Potential ecological risk evaluation showed the average value of RI was low, and the ecological risk coefficient （ E i ） of Pb reached to moderate risk level, while the other five heavy metals were in low risk.