Dose-effect correlation of chloride de-icing salt on Euonymus japonicus

摘要

In order to prevent severe pollution by de-icing salt on greenery along urban roads,a half lethal dose(LD50)for a plant population was confirmed through stress simulation of chloride de-icing salt on Euonymus japonicus,with an analysis of physiological changes,statistics on mortality rate on plant populations and mathematic modeling during a 30-day subacute toxicity test.The results indicate that a significant positive correlation in the early stages and a significant negative correlation in the later stages were observed between the amount of chlorophyll a and b in plants and a cumulative dose of de-icing salt.The amounts of free proline in plants and the dose of de-icing salt were positively correlated over the entire period.No significant correlation in the initial stage,but a significant negative correlation in later stages was observed between the soluble protein and the dose of de-icing salt.LD50of this chloride agent on E.japonicus is 5kg·(L·m2)–1over 30 days.