Effects of environmental conditions, low-level potassium, ethylenediaminetetraacetic acid, or combination treatment on radiocesium-137 decontamination in Napier grass
Effects of environmental conditions, low-level potassium, ethylenediaminetetraacetic acid, or combination treatment on radiocesium-137 decontamination in Napier grass
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环境条件、低浓度钾、乙二胺四乙酸或组合处理对纳皮草放射性铯 137 净化的影响
DOI：
10.1007/s11356-021-14177-x
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发表时间：
2021
影响因子：
5.8
通讯作者：
Yamada Masatoshi
中科院分区：
文献类型：
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作者：
Kang Dong-Jin;Tazoe Hirofumi;Yamada Masatoshi
植物提取法被广泛应用于去除土壤中的重金属或放射性核素等环境污染物。了解如何提高植物对污染物的积累是很重要的。以前，我们发现纳皮耶草（Pennisetum purpureumSchum.）具有有效去除Cs（133Cs和137Cs）的潜力。为了提高纳皮耶草的修复效果，研究了低浓度K（K）、乙二胺四乙酸（EDTA）以及低浓度K和EDTA的组合（K+EDTA）对修复效果的影响。我们还研究了两个种植年（2018年和2019年）之间137Cs去污的差异。总的来说，在2年的时间里，K、EDTA或K+EDTA处理对植物生长（株高、分蘖数）、地上生物量、137 Cs浓度和137 Cs去除率（CR）没有显著影响。然而，在这两年中，第一个生长期生长的植物的地上生物量（P<0.001），137 Cs浓度（仅2019年P< 0.001）和CR（P< 0.001）显著高于第二个生长期生长的植物。2019年的年平均137 Cs浓度（P< 0.001）和总CR（P< 0.001）显著高于2018年。2019年种植期间的降水量（1197毫米）是2018年（655毫米）的1.8倍。在本研究中，K、EDTA和K+EDTA处理对植物生长的影响小于自然环境条件。土壤水分是影响纳皮耶草地上部分生物量的重要因素，也是提高其修复效率的重要因素。
Phytoextraction is widely used to remove environmental pollutants such as heavy metals or radionuclides from soil. It is important to understand how to enhance the accumulation of contaminants by plants. Previously, we found that Napier grass (Pennisetum purpureumSchum.) has the potential to effectively remove Cs (133Cs and137Cs). In order to enhance the remediation efficiency of Napier grass, we evaluated the effects of low-level K (K), ethylenediaminetetraacetic acid (EDTA), or the combination of low-level K and EDTA (K+EDTA). We also examined the differences in137Cs decontamination between two cropping years (2018 and 2019). Overall, there were no prominent effects from the K, EDTA, or K+EDTA treatments on plant growth (plant height, tiller number), aboveground biomass,137Cs concentration, and137Cs removal ratio (CR) in 2 years. However, the aboveground biomass (P< 0.001),137Cs concentration (P< 0.001 in 2019 only), and CR (P< 0.001) in plants grown in the first growing period were significantly higher than in plants grown in the second growing period in both years. The mean137Cs concentration (P< 0.001) and total CR (P< 0.001) per year was significantly greater in 2019 than in 2018. The precipitation amount during the cultivation period in 2019 (1197 mm) was 1.8-fold higher than in 2018 (655 mm). In this study, the K, EDTA, and K+EDTA treatments had less effect plant growth than the natural environmental conditions. To enhance remediation efficiency, soil moisture is one important factor to produce more aboveground biomass to achieve high CR in Napier grass.