油菜-海州香薷轮作修复铜镉复合污染土壤:大田试验  

Application of Rotation System of Brassica Juncea and Elsholtzia Splendens to Remediate Copper and Cadmi-um-Contaminated Soil:A Field Trial

作　　者：朱俊艳[1] 于玲玲[1] 黄青青[1] 江荣风[1] 李花粉[1] 苏德纯[1] 

机构地区：[1]中国农业大学资源与环境学院,北京100193

出　　处：《农业环境科学学报》2013年第6期1166-1171,共6页Journal of Agro-Environment Science

基　　金：公益性行业(农业)科研专项(200903015);国家自然科学基金项目(40971261);国家863重点项目(2007AA061001)

摘　　要：通过高积累镉油菜与高积累铜植物海州香薷轮作的田间试验,研究了镉铜复合污染土壤上植物轮作对重金属的吸收累积规律以及修复效率。结果发现:在镉铜复合污染土壤上,油菜-海州香薷轮作体系中,油菜地上部的生物量达到7.67t·hm-2,籽粒产量1.59t·hm-2,但是籽粒中镉和铜含量超过标准限值90%和33%。油菜-海州香薷轮作体系,植物地上部吸收积累的镉和铜总量分别为35.16g·hm-2和400.68g·hm-2,其中油菜对镉积累的贡献占83%,海州香薷对铜积累的贡献占73%。轮作体系中植物对镉和铜的提取效率分别为0.2%和0.07%。研究结果表明,油菜与海州香薷轮作不适用于该铜镉重度复合污染土壤,不仅油菜籽粒达不到食品卫生标准的要求,而且土壤修复的年限比较长。Soil contamination with heavy metal has become an important issue that affects public health. So there is an urgent requirement for selecting appropriate technologies to solve food safety problems due to soil contamination. In this study, a field experiment was performed to study the accumulation and remediation efficiency of heavy metals in the rotation system of Brassica juncea and Elsholtzia splendens on a heavy metal-contaminated field. The results showed that the straw biomass of the oilseed rape reached 7.67 t·hm^-2 and the seed yield was 1.59 t·hm^-2. The concentrations of Cd and Cu in the seed were 90% and 33% higher than the permissible limits, respectively. In the rotation system of Brassica juncea and Elsholtzia splendens, the total uptake of Cd and Cu by shoots were 35.16 g·hm^-2 and 400.68 g·hm^-2, respectively, in which Brassica juncea accounted for 83% of the total Cd uptake and Elsholtzia splendens accounted for 73%. The remediation efficiency was 0.2% for Cd and only 0.07% for Cu. These results indicated that the rotation of Brassica juncea and Elsholtzia splendens was not suitable for the highly copper and cadmium-contaminated soil. Not only the quality of the harvested seed does not meet the requirements of food hygiene standards, but also it will take a long time to remediate the polluted soil through the phytoremediation.

关 键 词：镉铜复合污染 油菜 海州香薷 植物修复 轮作 

分 类 号：X53[环境科学与工程—环境工程]