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首页> 外文期刊>Plant and Soil >Chelate-assisted phytoextraction using canola (Brassica napus L.) in outdoors pot and lysimeter experiments
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Chelate-assisted phytoextraction using canola (Brassica napus L.) in outdoors pot and lysimeter experiments

机译：在户外盆栽和溶渗仪实验中使用双低油菜籽（甘蓝型油菜）进行螯合物辅助的植物提取

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摘要

Phytoextraction is an emerging technology for non-destructive remediation of heavy metal-polluted soils. This study was conducted to test chelate-assisted phytoextraction of Cu, Pb and Zn using EDTA and canola (Brassica napus L. cv. Petranova) on a moderately polluted industrial soil (loamy sand) in the sub-continental climate of Eastern Austria. The effects of the rate (up to 2.1 g kg(-1) soil) and mode (single versus split) of EDTA application on the biomass, water contents and metal concentrations in shoots and roots were investigated along with changes of metal lability in soil and leaching from the root zone in parallel outdoors pot and lysimeter experiments. Labile (1 M NH4NO3-extractable) metal concentrations in soil increased considerably upon application of EDTA, indicating enhanced phytoavailability. However, this was also associated with enormously increased metal concentrations in the leachates collected below the root zone. Enhanced metal labilities and leachate concentrations persisted for more than 1 year after harvest. Metal lability was more enhanced by EDTA in rhizosphere relative to bulk soil, indicating interactions of EDTA with root activities. Shoot biomass and water contents of canola were virtually unaffected by EDTA, revealing that canola can tolerate excessive metal concentrations in soil pore water. Metal concentrations in shoots were increased considerably, but were insufficient to obtain reasonable extraction rates. Split applications were generally more effective than the same amounts of EDTA added at once. Metal concentrations in roots decreased after each application of EDTA, possibly indicating metal removal from roots by free protonated EDTA, but increased again within several days. As the application of chelate-assisted phytoextraction is limited by the risk of groundwater pollution, further work should focus on natural, continuous phytoextraction technologies.
机译：植物提取是一种用于重金属污染土壤的非破坏性修复的新兴技术。这项研究的目的是在东部次大陆性气候的中等污染工业土壤（壤土沙）上，使用EDTA和低芥酸菜籽（芸苔属油菜Petranova）测试铜，铅和锌的螯合辅助植物提取。研究了EDTA施用量（最大2.1 g kg（-1）土壤）和施用方式（单次分裂）对枝条和根中生物量，水分和金属浓度的影响，以及土壤中金属不稳定性的变化。在平行的户外盆栽和蒸渗仪实验中从根部浸出。施用EDTA后，土壤中的不稳定金属（1 M NH4NO3可提取）的浓度显着增加，表明提高了植物的利用率。但是，这也与根区以下收集的渗滤液中金属浓度的极大增加有关。收获后，金属不稳定性和浸出液浓度的提高持续了一年以上。相对于块状土壤，EDTA在根际中的金属不稳定性进一步增强，表明EDTA与根系活动之间存在相互作用。 EDTA几乎不影响油菜的茎生物量和水分含量，这表明油菜可以耐受土壤孔隙水中过量的金属。枝条中的金属浓度显着增加，但不足以获得合理的提取率。拆分应用通常比一次添加相同量的EDTA更有效。每次施用EDTA后，根中的金属浓度降低，这可能表明游离的质子化EDTA从根中去除了金属，但几天后又再次增加。由于螯合辅助植物提取的应用受到地下水污染风险的限制，因此进一步的工作应侧重于自然，连续的植物提取技术。

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