不同螯合剂处理下杨树对土壤中Cd的吸收和富集效应  

Chelate-induced uptake and accumulation of Cd in soil by poplar(Populus bolleana Lauche)

作　　者：雒焕章[1,2] 南忠仁[1,2] 胡亚虎[1,2] 金诚[1,2] 王宁[1,2] 

机构地区：[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

出　　处：《中国环境科学》2013年第3期461-465,共5页China Environmental Science

基　　金：国家自然科学基金资助项目(51178209;91025015);兰州大学博士研究生学术新人奖

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中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EGTA>EDTA>CA的顺序.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＇gV＇-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 1.42-2.77 times higher than the control, respectively. In general, chelating agents effectively mobilized Cd in the soil and promoted the translocation of Cd from roots to shoots as EGTA〉EDTA〉CA.

关 键 词：植物修复 杨树 CD EGTA 污染土壤 

分 类 号：X171.5[环境科学与工程—环境科学]