表面活性剂对叶面滞尘作用的影响

表面活性剂能够增强植物叶面滞尘能力,研究不同表面活性剂对植物滞尘能力的影响,对于利用植物防治粉尘污染有重要意义。以LAS、DTAB、AR和APG200为喷洒试剂,研究了8种植物吸附表面活性剂后滞留粉尘的重量、组分。结果表明,LAS浓度、植物种类、表面活性剂类型对滞尘量和面积比具有显著影响(P<0.05);表面活性剂能够有效提高植物滞尘能力,LAS、DTAB效果优于生物型AR、APG200,且测试叶面滞尘量的变化与叶面接触角无明显关系;LAS使除朴树外所有植物的滞尘能力增加的浓度为0.2 g/L,而对滞留粉尘组分改变较大的浓度为0.5 g/L;此外,表面活性剂能改变滞留粉尘的组分,但不具有明显的规律性,粉尘的遮光比变化趋势与叶面滞尘量基本相似。

Effect of surfactant on foliar dust retention

Surfactants can enhance the foliar dust retention capacity of plants.Studies of the effect of different surfactants on the dust retention capacity have great significance to prevent dust pollution by using plants.Taking LAS,DTAB,AR and APG200 as spraying reagents,we study the weight and components of the retained dust on the leaf surface of 8 plants after they had adsorbed surfactants.The results show that LAS concentration,plant species and surfactant type have significant effect on amount of dust and the stagnation area ratio (P<0.05).Surfactants can effectively improve the dust retention capacity of plants,the function of LAS,DTAB is better than biotypes AR and APG200.The test changes of foliar dust retention have no significant relationship with foliar contact angle.The concentration of LAS which make all plants except Hackberry increase their dust retention capacity is 0.2 g/L,while the concentration which changes the components of retained dust to a large extent is 0.5 g/L.Furthermore,surfactant can change the components of retained dust,but it has no obvious regularity.