水生植物对灌溉水中镉去除作用的筛选及机制研究  

Screening and Mechanism Research of Aquatic Plants on the Removal of Cadmium from Irrigation Water

作　　者：李智义 彭亮[2] 宋慧娟[2] 李冰玉 毕军平 LI Zhi-yi;PENG Liang;SONG Hui-juan(Hunan Ecological Environment Monitoring Center,Changsha,Hunan 410014;College of Resources and Environment,Hunan Agricultural University,Changsha,Hunan 410128)

机构地区：[1]湖南省生态环境监测中心,湖南长沙410014 [2]湖南农业大学资源环境学院,湖南长沙410128 [3]国家环境保护重金属污染监测重点实验室,湖南长沙410019

出　　处：《安徽农业科学》2022年第11期77-80,共4页Journal of Anhui Agricultural Sciences

基　　金：国家重点研究发展计划(SQ2017YFNC060064);湖南省自然科学基金项目:(2017JJ2112);湖南省教育厅重点项目(18A095);国家环境保护重金属污染监测重点实验室基金项目:(SKLMHM202101,SKLMHM202116)。

摘　　要：灌溉水中悬浮态的镉被认为是湖南省农田镉污染的主要来源,通过比较紫背浮萍、美人蕉、狐尾藻和水葫芦4种典型南方水生植物对悬浮态镉去除的效果,筛选出效果更好的水葫芦和狐尾藻,进一步收集植物根部悬浮物、体系底泥,分析其镉含量并开展机制研究。结果表明,4种水生植物中狐尾藻镉去除效果最佳,去除效率为94.42%。植物对镉的去除主要通过助沉降和吸附,其中沉降部分所占比例最高,根系复杂的水生生物在去除灌溉水中镉的方面显示出良好的性能,狐尾藻沉降部分的镉含量占81%左右。Suspended cadmium in irrigation water is considered to be the main source of cadmium pollution in farmland in Hunan Province.By comparing the effects of four typical southern aquatic plants(Spirodela polyrrhiza,Canna indica,Myriophyllum spicatum and Eichhornia crassipes)on the removal of suspended cadmium,the Eichhornia crassipes and Myriophyllum spicatum with better effects were screened out,and the suspended solids in plant roots and system sediment were further collected,and the cadmium content was analyzed and the mechanism was studied.The results showed that among the four aquatic plants,the removal efficiency of cadmium from Myriophyllum spicatum was the best,and the removal efficiency was 94.42%.The removal of cadmium by plants was mainly through sedimentation and adsorption,in which the sedimentation part accounts for the highest proportion.Aquatic organisms with complex root systems showed good performance in removing cadmium from irrigation water.The cadmium content in the sedimentation part of Myriophyllum spicatum accounted for about 81%.

关 键 词：镉 悬浮物 水生植物 去除作用 筛选 机制 

分 类 号：X173[环境科学与工程—环境科学]