南京大学学报(自然科学版) ›› 2019, Vol. 55 ›› Issue (2): 282290.doi: 10.13232/j.cnki.jnju.2019.02.013
谢探春,王国兵,尹 颖*,郭红岩
Xie Tanchun,Wang Guobing,Yin Ying*,Guo Hongyan
摘要: 柳树应用于土壤修复,不仅展现对镉良好的富集性,对污染环境良好的适应性,还能发挥景观植物的特性,避免将污染引入食物链. 研究通过90 d温室盆栽实验探讨了三种能够有效富集重金属的柳树(Salix×aureo-pendula CL‘J1011’,Salix×Jiangsuensis ‘J172’,Salix×Jiangsuensis ‘55’)对于镉-芘复合污染土壤的修复潜力. 结果表明:三种柳树均表现出良好的耐受性且同时具有富集镉和降解芘的性能;其中金丝垂柳1011对镉的富集达到231.4 μg·kg-1,同时使芘的残留量减少了88.6%. 与单一镉/芘污染相比,复合污染抑制了苏柳172和苏柳55叶片中镉的富集,富集系数分别降低了54.4%和44.1%,同时抑制了柳树对土壤中芘的去除效果,去除率分别降低了3.4%和27.0%;复合污染情况下金丝垂柳1011对镉的吸收不受影响,但对芘的去除具有更好的效果,去除率提高6.5%,体现其在重金属-有机物复合污染修复方面更高的应用潜力.
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