| 不同程度镉污染农田中粉葛镉富集转运特征 |
| 摘要点击 2188 全文点击 692 投稿时间：2022-12-03 修订日期：2022-12-30 |
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| 中文关键词 镉(Cd)污染土壤 粉葛 富集植物 生物量 富集特征 |
| 英文关键词 cadmium(Cd) polluted soil Pueraria thornsonii hyperaccumulation plant biomass accumulation characteristics |
| 作者 | 单位 | E-mail | | 林小兵 | 江西农业大学国土资源与环境学院, 南昌 330045
江西省红壤及种质资源研究所国家红壤改良工程技术研究中心, 南昌 331717 | linxiaobing14@mails.ucas.ac.cn | | 何绍浪 | 江西省红壤及种质资源研究所国家红壤改良工程技术研究中心, 南昌 331717 | | | 吴多基 | 江西农业大学国土资源与环境学院, 南昌 330045 | | | 周利军 | 江西省红壤及种质资源研究所国家红壤改良工程技术研究中心, 南昌 331717 | | | 武琳 | 江西省红壤及种质资源研究所国家红壤改良工程技术研究中心, 南昌 331717 | | | 彭君 | 萍乡市农业科学研究中心, 萍乡 337000 | | | 黄尚书 | 江西省红壤及种质资源研究所国家红壤改良工程技术研究中心, 南昌 331717 | | | 王斌强 | 江西省红壤及种质资源研究所国家红壤改良工程技术研究中心, 南昌 331717 | | | 黄欠如 | 江西省红壤及种质资源研究所国家红壤改良工程技术研究中心, 南昌 331717 | | | 吴建富 | 江西农业大学国土资源与环境学院, 南昌 330045 | wjf6711@126.com |
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| 中文摘要 |
| 探究不同程度镉（Cd）污染土壤对粉葛植株Cd积累分配特征的影响，为Cd污染农田的植物修复提供参考依据.在不同Cd污染［ω（Cd）为0.32~38.08 mg ·kg-1］农田开展多点试验，分析了粉葛主要生育期不同部位生物量、Cd含量、Cd积累量及其富集和转运系数.结果表明，研究区粉葛块根干重为5.04~11.98 t ·hm-2，生物量为13.21~29.07 t ·hm-2，Cd积累量为15.74~106.03 g ·hm-2；粉葛对Cd的吸收规律表现为：主藤>叶片>侧枝>葛头>块根；随着土壤Cd含量的增加，粉葛各部位Cd含量均显著增加（P<0.05），而生物量均显著降低（P<0.05）；粉葛地上部Cd富集和转运系数呈先增大后减小的变化趋势，而根部Cd富集和转运系数均逐渐减小.相关分析表明，土壤Cd含量是影响粉葛Cd积累的关键因素.在轻中度Cd污染下，粉葛经济部分（葛粉）ω（Cd）为0.03~0.22 mg ·kg-1，均低于药用植物的标准限值（≤0.30 mg ·kg-1）；在中度污染粉葛地上部Cd富集和转运系数分别为2.43~7.97和3.02~9.81.粉葛具有很强的Cd富集和运输能力，是适合用作Cd污染土壤修复的潜力植物. |
| 英文摘要 |
| This study aimed to elucidate the cadmium (Cd) concentration and transport characteristics of Pueraria thornsonii in farmland with different Cd pollution degrees, so as to provide a reference basis for phytoremediation of Cd-contaminated farmland. The multi-point experiments in farmland with different Cd pollution degrees[ω(Cd) 0.32-38.08 mg·kg-1] were conducted, and the biomass (dry weight), Cd content, accumulation, concentration, and transport of Cd in P. thornsonii tissues under the main growing period were assessed. According to the results, for P. thornsonii, the tuber dry weight ranged from 5.04 to 11.98 t·hm-2, biomass ranged from 13.21 to 29.07 t·hm-2, and Cd accumulation ranged from 15.74 to 106.03 g·hm-2in the study area. The pattern of Cd uptake by P. thornsonii showed that the main vine>leaf>lateral branches>basal part of sti>tuber. The Cd content in P. thornsonii tissues considerably increased with soil Cd content (P<0.05), whereas the biomass decreased significantly (P<0.05). The Cd concentration and transport factor of aboveground parts in P. thornsonii showed a trend of initially falling, then increasing and decreasing again, whereas the Cd enrichment and transport coefficient of tubers gradually decreased. Correlation analysis revealed that the amount of Cd in the soil was a major predictor of Cd accumulation in P. thornsonii. Under light to moderate Cd contamination, the commercial portion of P. thornsonii (arrowroot)[ω(Cd) 0.03-0.22 mg·kg-1] was less than the standard limit for medicinal plants (≤ 0.30 mg·kg-1). In P. thornsonii from moderately contaminated areas, the Cd concentration and transport factor of aboveground parts were 2.43-7.97 and 3.02-9.81, respectively. This indicates that P. thornsonii is a prospective plant ideal for remediating Cd-contaminated soil because of its high capacity to transfer and enrich Cd. |
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