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引用本文:刘寿涛,杨蕊嘉,何钟响,等.灌溉水湿地净化系统中镉的分布及积累特征[J].灌溉排水学报,2019,(10):-.
LIU Shou-tao,YANG Rui-jia,HE Zhong-xiang,et al.灌溉水湿地净化系统中镉的分布及积累特征[J].灌溉排水学报,2019,(10):-.
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灌溉水湿地净化系统中镉的分布及积累特征
刘寿涛,杨蕊嘉,何钟响,等
1.湖南农业大学资源环境学院;2.湖南省灌溉水源水质污染净化工程技术研究中心;3.农业部南方产地污染防控重点实验室
摘要:
我国南方重金属超标水灌溉已成为农田生态系统重金属输入最主要来源,从源头治理我国南方农田灌溉水的重金属Cd污染具有重要实践意义。本试验选取梭鱼草、狐尾藻、轮叶黑藻三种湿地植物作为材料,构建沉砂池+生态塘+表面流湿地+吸附池系统,探究系统底泥Cd含量及有机质含量变化与三种湿地植物体内的Cd浓度变化趋势及富集转运系数。结果表明,该湿地系统底泥中Cd含量随水流方向呈现递减趋势,各个采样点Cd浓度随时间推移而增加,底泥中Cd含量变化范围为1.15-38.58 mg.kg-1。底泥有机质含量随水流沿程呈现缓慢下降趋势,下降幅度最高为13.9 g.kg-1。三种湿地植物中,梭鱼草地下部Cd含量较高,最高达125.88 mg.kg-1,地上部最高达9.16 mg.kg-1,狐尾藻、轮叶黑藻体内浓度最高分别达到32.55 mg.kg-1、6.94 mg.kg-1。梭鱼草的富集与转运系数范围分别为8.24-34.96、0.036-0.176,说明梭鱼草中大部分Cd固定于根部,向上转运较少。三种植物中梭鱼草具有较高的农田灌溉水中Cd净化潜力。研究结果可为我国南方Cd污染灌溉水净化提供数据支持。
关键词:  生态塘; 有机质; 镉; 湿地植物; 富集系数;转运系数;人工湿地
DOI:
分类号:X171.5
基金项目:国家重点研发计划项目(2017YFD0801505);湖南省重点研发计划项目(2015NK3015);农业部、财政部专项(20160418)
Effect of plant pond and constructed wetland system on irrigation water purification and rice cadmium control
LIU Shou-tao1, YANG Rui-jia1, HE Zhong-xiang1, PENG Ou1, LIU Yu-ling1, DONG Si-jun1, PENG Jing1, LIU Xiao-li1, TIE Bai-qing1,2,3,2,4,2
1.College of Resources and Environment of Hunan Agricultural University;2.China;3.The Engineering Technology Research Center of Water Pollution Purification of Irrigation Water Source,Hunan Province;4.Key Laboratory of Southern Original Agro-Environmental Pollution Prevention and Control,Ministry of Agriculture Changsha
Abstract:
Irrigation of heavy metals exceeding water in southern China has become the most important source of heavy metal input in farmland. It has great practical to control heavy metal Cd pollution from irrigation water in southern China. In this study, three wetland plants, barracuda, Myriophyllum sp., and Hydrilla verticillata, were used to build a grit chamber + ecological pond + surface flow wetland + adsorption pool system, and to explore the changes of Cd content and organic matter in the sediment of the wetland systems. The trend of Cd concentration in plant tissues and the BF, TF coefficient. The results showed that the Cd content in the sediment of the wetland system showed a decreasing trend with the flow direction. The concentration of Cd at each sampling sites increased with sampling time, and the Cd content in the sediment ranged from 1.15 to 38.58 mg.kg-1. The organic matter content of the sediment gradually decreased with the flow direction and the highest drop was 13.9 g.kg-1. Among the three wetland plants, the highest Cd content in the belowground and aboveground parts of the barracuda was 125.88 mg.kg -1 and 9.16 mg.kg -1. The highest concentrations in the foxtail algae and Hydrilla verticillata reached 32.55 mg.kg -1, 6.94 mg.kg -1respectively.The BF and TF coefficient of Barracuda were 8.24-34.96 and 0.036-0.176, respectively, indicating that most of the Cd in the barracuda was accumulated at roots rather than transport. Among the three plants, the barracuda has high Cd purification potential in farmland irrigation water. The research results can provide data support for Cd polluted irrigation water purification in southern China.
Key words:  Ecological pond; organic matter; cadmium; wetland plant; enrichment factor; transport coefficient; constructed wetland