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螯合剂强化下新疆杨对干旱区Pb污染农田土壤的修复

Keywords: 杨树,螯合剂,植物修复,重金属,污染土壤

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Abstract:

通过盆栽实验,研究了EDTA、EGTA和柠檬酸(CA)3种螯合剂强化下新疆杨对干旱区农田土壤中Pb的吸收和富集特征。实验结果表明:与不投加螯合剂的对照相比,螯合剂的投加显著提高了土壤中水提态Pb的含量,其活化效果表现为EDTA>EGTA>CA,但螯合剂并未对杨树地上部分生物量产生显著的抑制作用。3种螯合剂均显著提高了杨树根中Pb的含量,其增幅达59%~87%,其中以9mmol·kg-1EDTA处理下增幅最大;3种螯合剂均未显著提高杨树树干中Pb的含量,但在EDTA的2个投加水平(3、9mmol·kg-1)作用下,杨树叶中Pb的含量和对照相比则显著增加,其增幅分别为125%和332%。Pb主要积累在杨树根部,3种螯合剂处理下杨树根中Pb的积累量占杨树总Pb积累量的比例由对照的88%增至94%~98%。总体而言,EDTA相比于EGTA和CA,更有助于杨树对土壤中Pb的吸收和积累。

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