壳聚糖辅助下玉米修复铅污染土壤能力的研究The Potential of Corns(Zea mays L.)for Phytoremediation of Pb-Contaminated Soils with the Aid of Chitosan Addition
刘良栋;张伟安;舒俊林;杨智宽;汪玉庭;
摘要(Abstract)：
为了研究壳聚糖辅助下玉米(ZeamaysL.)对铅污染土壤的修复能力,采用L9(34)正交试验进行研究,考虑了4因素3水平,4因素为土壤铅含量、壳聚糖含量、壳聚糖溶液pH值以及加入壳聚糖后的提取时间.研究结果表明,加入壳聚糖会造成玉米生长停滞,甚至死苗,原因在于壳聚糖属于天然高分子有机物,会造成土壤板结,阻碍植物吸收水分,同时壳聚糖将土壤中的大量重金属溶出,造成玉米重金属中毒.加入壳聚糖后,玉米对铅的吸收较对照结果有很大提高,壳聚糖能够促进铅元素从土壤向植物体内转移,但壳聚糖促进铅元素从玉米地下部分向地上部分转移的能力较弱;综合壳聚糖的促进效果,在土壤铅含量为1.8g·kg-1,壳聚糖含量为5mmol·kg-1(土),壳聚糖溶液pH值为4.5,提取时间为7天的条件下,有利于促进铅在玉米地上部分的吸收.
关键词(KeyWords)： 植物修复;植物提取;土壤铅污染;壳聚糖;玉米
基金项目(Foundation): 国家自然科学基金项目(No.20377033)
作者(Author): 刘良栋;张伟安;舒俊林;杨智宽;汪玉庭;
Email:
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