不同螯合剂处理下杨树对土壤中Cd的吸收和富集效应.pdfVIP

中国环境科学 2013,33(3) ：461~465 China Environmental Science 不同螯合剂处理下杨树对土壤中 Cd 的吸收和富集效应 雒焕章 1,2,南忠仁 1,2*,胡亚虎 1,2,金 诚 1,2,王 宁 1,2 (1.兰州大学环境科学系,甘肃 兰州 730000 ；2.西部环 境教育部重点实验室,甘肃 兰州 730000) 摘要：通过盆栽试验,研究了分别投加 1,3,9mmol/kg 的 EDTA 、EGTA 和柠檬酸(CA),新疆杨对干旱区污染土壤 Cd 的吸收和富集特征. 实验结果表明,投加螯合剂的处理土壤中水提态 Cd 的含量是对照的4.27~249.12 倍,但杨树地上部的生物量和对照相比并未显著降低.投加 螯合剂的处理显著提高了杨树叶部 Cd 的含量和积累量,其值分别是对照的 1.05~2.90 和 1.42~2.77 倍.综合来看,螯合剂的投加有效活化了 土壤中的 Cd 和促进了 Cd 从杨树根部向其地上部的转移,3 种螯合剂的作用效果表现为 EGTAEDTACA 的顺序. 关键词：植物修复；杨树；Cd ；EGTA ；污染土壤 中图分类号：X171.5 文献标识码：A 文章编号：1000-6923(2013)03-0461-05 Chelate-induced uptake and accumulation of Cd in soil by poplar (Populus bolleana Lauche). LUO Huan-zhang1,2, NAN Zhong-ren 1,2*, HU Ya-hu1,2, JIN Cheng1,2, WANG Ning1,2 (1.College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China ；2.Key Laboratory of Western China’s Environmental Systems, Ministry of Education, Lanzhou 730000, China). China Environmental Science, 2013,33(3)：461~465 Abstract ：In order to investigate the uptake and accumulating characteristics of Cd by poplar (Populus bolleana Lauche) in response to the addition of ethylenediamine tetraacetic acid (EDTA), ethylene glycol-bis(2-aminoethylether)- N,N,N′,N′-tetraacetic acid (EGTA) and citric acid (CA) at levels of 1, 3 and 9 mmol/kg, respectively, a pot experiment was designed and performed. Results showed that water-extractable Cd concentration in soils added with chelating agents was 4.27~249.12 times higher than the control, while no significant reduction in aboveground biomass was observed in response to the addition of chelating agents compared with the control. The addition of chelating agents significantly increased the concentration and amount of Cd in poplar leaves, the values which were 1.05~2.90 and 1.42