氯盐融雪剂与大叶黄杨致死的剂量--效应关系

为预防无机盐类融雪剂对城市道路绿化造成严重的环境污染，通过不同浓度氯盐融雪剂对大叶黄杨的亚急性毒理试验，分析植株的生理变化，统计种群致死率，并结合建模分析，确定种群半致死剂量。结果表明:在污染前期大叶黄杨的叶绿素a、b总量与氯盐融雪剂累积剂量呈显著正相关，污染后期则呈显著负相关；在污染毒害全程中，植物组织中游离脯氨酸含量与融雪剂的施用累积剂量呈极显著正相关；可溶性蛋白含量在污染前期与融雪剂累积剂量相关性不显著，而在后期则与之呈显著负相关性。氯盐融雪剂对大叶黄杨的种群30 d半致死剂量为5 kg/(L?m2)。 

Lethal dose-effect correlations of chloride snow-melting agent on Euonymus japonicus

To prevent severe pollution of inorganic snow-melting agents on greenery along urban roads,half lethal dose(LD50) of plant population was confirmed through stress simulation of chloride snow-melting agent on Euonymus japonicus,plant physiological change analysis,plant population lethality rate statistic and mathematic modeling analysis within a 30-day subacute toxicity test.Results indicated that a significant positive correlation in the early stage and a significant negative correlation in the later stage were observed between the total content of chlorophyll a and b in plants and cumulative dose of chloride snow-melting agent.The free L-proline content in plants and the dose of snow-melting agent were positively correlated during the whole period.No significant correlation in the initial stage,but a significant negative correlation in the later stage was observed between the soluble protein and the dose of snow-melting agent.The LD50 of chloride snow-melting agent on E.japonicus is 5 kg/(L·m2) within a 30-day period.