王静++何安++李德生++晁桌锡++俞洋++朱秀锦++张才

摘要：通过盆栽模拟试验，验证日本楤木（Arlia elata var. inermis）对重金属Cd污染土壤是否有修复效果及重金属Cd在植物体内的累积转移是否影响其食用安全性。结果表明，日本楤木对重金属Cd的富集能力较强且转运系数较大，且地上部的富集系数高于地下部的富集系数。日本楤木根、茎、叶中的重金属含量超过了国家无公害绿色蔬菜标准，不符合食用标准。通过日本楤木对重金属Cd污染的修复效率来看，日本楤木对低浓度重金属Cd污染的土壤修复效率达到最大，为60%，随着重金属Cd胁迫浓度的增加，日本楤木的修复效率逐渐降低。因此，在重金属Cd污染的农田土壤中，日本楤木可作为抗污染植物，但体内的重金属Cd的含量表明不宜直接食用。

关键词：日本楤木（Arlia elata var. inermis）；重金属Cd；富集；修复效率

中图分类号：X53 文献标识码：A 文章编号：0439-8114（2017）16-3067-03

DOI：10.14088/j.cnki.issn0439-8114.2017.16.016

The Remediation Efficiency of Soil Polluted by Heavy Metal Cd

WANG Jing1，HE An1，LI De-sheng1，CHAO Zhuo-xi1，YU Yang1，ZHU Xiu-jin1，ZHANG Cai2

（1.College of Environmental Science and Safety Engineering，Tianjin University of Technology，Tianjin 300381，China；

2.Rushan Forestry Bureau of Shandong Province，Rushan 264500，Shandong，China）

Abstract： By means of pot simulation experiment，the remediation effect of soil polluted by Cadmium and the edible safety of Aralia elata var. inermis were validate. The results showed that A. elata had better accumulation ability of Cd with higher transfer coefficient，and the bioaccumulation factor of overground part was higher than underground part. The content of Cd in root，stem and leaf of A. elata in line were higher than the national organic green vegetable standard，which was inedibility.From the aspect of remediation efficiency of soil polluted by Cd with A. elata，the value was the highest as 60% at the lower Cd content. With the increases of Cd content，the remediation efficiency decreased gradually. Therefore，A. elata could be used as anti-pollution plant in soil with Cd pollution. However，the plant which had Cadmium illustrated couldnt be eaten any more.

Key words： Aralia elata var. inermis； heavy metal Cd； enrichment； remediation efficiency

由于矿产资源的开发利用、工业生产的快速发展及各种化学农药、化肥等物质的大量使用，导致重金属污染物进入环境中，造成土壤污染，尤其是农田土壤重金属污染较为严重[1]。中国受Cd、Hg、Pb等污染的耕地面积约为2×107 hm2，受污染的粮食多达1.2×107 t，经济损失至少达到2×1010元[2，3]。除此之外，受重金属污染后的粮食一旦被人类误食，则会对人体造成严重的危害，如痛痛病、软脚病等症状。大多数学者将重心放在蔬菜[4]、粮食[5]、园林植物[6]、草本植物[7]对重金属Cd污染土壤的修复，且方向更偏于植物的生理生化方面，很少学者研究木本植物对重金属污染土壤的修复。……