期刊论文

Effects of plant pond and constructed wetland system on irrigation water purification and rice cadmium control

中文

农业环境科学学报

1672-2043

2019

38

5

1060-1068

10.11654/jaes.2018-1216

(2017YFD0801505):国家重点研发计划项目 (2015NK3015):湖南省重点研发计划项目 (20160418):农业部、财政部专项

本校为第一机构

为了降低灌溉水中Cd向农田中输入,减轻农田重金属Cd污染,降低稻米中Cd含量.本试验选取梭鱼草、狐尾藻、轮叶黑藻为材料,构建3级植物塘+人工湿地系统,研究其对湖南典型矿区Cd超标灌溉水(全量Cd浓度均值≈6.65 μg·L~(-1))净化效果及稻米Cd阻控效果,并分析灌溉水进出水浓度与干湿沉降通量对系统净化效果的影响及净化系统中湿地植物的吸附能力.结果表明:梭鱼草、狐尾藻、轮叶黑藻3种水生植物对灌溉水中Cd具有较好的去除能力,经系统净化后灌溉水中全量和可溶态Cd平均去除率分别高达70%和91%,可有效降低湿地系统中重金属Cd浓度并阻止灌溉水中Cd向稻田迁移.湿地进水Cd浓度易随降雨产生波动,但湿地系统...

To reduce the input of cadmium(Cd)into farmland with irrigation water and reduce Cd pollution in farmland and rice content, a field experiment was carried out to evaluate the effects of a three-level constructed wetland planted with Pontederia cordata, Myriophyllum verticillatum, and Hydrilla verticillata on Cd uptake ability when Cd exceeded standard irrigation water in amining area(the average Cd concentration was ≈6.65 μg·L~(-1)). The effects of dry and wet deposition flux on system purification were also analyzed. The results showed that...