| 人工湿地系统中梭鱼草和香蒲对镉积累的动态变化 |
| Cadmium Accumulation in Pontederia cordata and Typha orientalis in a Constructed Wetland |
| 投稿时间：2018-08-07 修订日期：2020-04-23 |
| DOI：10.15928/j.1674-3075.2020.02.014 |
| 中文关键词:人工湿地 梭鱼草 香蒲 富集与转运 镉 |
| 英文关键词:constructed wetland Pontederia cordata Typha orientalism accumulation and translocation cadmium |
| 基金项目:国家重点研发计划(2017YFD0801105)；农业部与财政部科研专项(农办财函〔2016〕6号)；湖南省教育厅项目(湘财教指〔2015〕54号)；湖南省重点学科建设项目(2006180)。 |
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| 中文摘要: |
| 为探讨人工湿地系统中两种挺水植物（梭鱼草和香蒲）对Cd积累的动态变化，通过在室外表面流人工湿地采样和室内分析相结合的方法，对8～12月份梭鱼草和香蒲地上部和地下部的生物量、Cd含量及积累量的动态变化进行了分析。结果表明：梭鱼草和香蒲的根部Cd含量均显著高于各自的茎叶部Cd含量，且在10月份各部位Cd含量最高。两种植物的生物量和对湿地中Cd积累量分别在9月份、10月份达到最大值。两者对Cd的富集与转运能力均随着月份的变化而变化，梭鱼草随月份变化更明显。在10月份之前，同一月份梭鱼草地上部的生物量和对湿地中Cd积累量均极显著或显著高于香蒲。两种植物地上部分生物量和对湿地中Cd积累量均极显著高于地下部分(p<0.01)。综合考虑两种植物的生物量及对Cd的积累量，9月份和10月份分别为梭鱼草和香蒲地上部分最佳收获月份，能够最大化去除湿地系统中的Cd2+。 |
| 英文摘要: |
| Aquatic plants that can effectively remove heavy metals and other pollutants from water are selected for use in the construction of artificial wetlands. In this study, we investigated the dynamic changes in cadmium accumulation in Pontederia cordata and Typha orientalis in a surface flow constructed wetland. The wetland system used for the investigated has three treatment ponds and the P. cordata and T. orientalis were transplanted into the first treatment pond in May, 2017. The biomass and cadmium accumulation, above and below ground, in the two emergent plant species were analyzed each month from August to December. The study objectives were to provide basic data and a theoretical reference for assessing the cadmium removal capacity of the plants and determine the best time for harvesting plants in the constructed wetland. The cadmium content ranges of P. cordata and T. orientalis roots were 0.25-0.70 mg/kg and 0.16-0.39 mg/kg, while the ranges in stems/leaves were 0.07-0.18mg/kg and 0.11-0.17 mg/kg. The cadmium content of roots was significantly higher than that of the stems/leaves. Although tissue concentrations were lower, the biomass and cadmium accumulation were significantly higher in the stems and leaves of both species (P<0.01). Cadmium removal and accumulation varied by month, increasing initially and then decreasing in both species. Before October, the biomass and cadmium accumulation of the above-ground parts of P. cordata were significantly higher than those of T. orientalis. The maximum cadmium concentration, in both tissue types of both species occurred in October, as did the highest cadmium accumulation coefficients. The cadmium accumulation coefficient ranges were 0.76-3.13 for P. cordata and 0.63-0.91 for T. orientalis, the translocation coefficient ranges were 1.12-10.47 for P. cordata and 3.25-8.10 for T. orientalis, and the maximum values were observed in September and October. In summary, September and October is the best time for harvesting the above-ground parts of P. cordata and T. orientalis, respectively, as it maximizes cadmium removal from the wetland. |
| 梅金星,张 平,彭佩钦,李 倩,李 靖.2020.人工湿地系统中梭鱼草和香蒲对镉积累的动态变化[J].水生态学杂志,41(2):98-104. |
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