College of Resources and Environment, Yangtze University, Wuhan, China.
School of Civil Engineering, Shandong University, Jinan, China.
Int J Phytoremediation. 2022;24(12):1273-1283. doi: 10.1080/15226514.2021.2025203. Epub 2022 Jan 11.
With the economic development of society, concentrations of atmospheric CO and heavy metals in soils have been increasing. The physiological responses of plants to the interaction between soil pollution and climatic change need to be understood. Pot experiments were designed to assess variations in dry weight, leaf type, chlorophyll content, antioxidase activities, and Cd accumulation ability, under different atmospheric CO treatments. The results showed that the total dry weights increased with increasing CO, and Cd concentrations in falling leaf tissues increased with raised atmospheric CO, before reaching a peak at 600 ppm, above which they remained constant. Compared with the control (400 ppm), 600, 650, and 700 ppm CO treatments increased the proportions of the falling tissues by 1.7%, 3.3%, and 4.5%, respectively. Antioxidant enzyme activities in plant leaves increased with increasing atmospheric CO levels. The concentration of HO in leaf tissues increased with increasing CO, reaching a peak at 600 ppm, and then decreased significantly as the CO content increased further, to 700 ppm. The results in this study suggest that could be regarded as a potential candidate for phytoremediation of Cd-polluted soil; especially if senescent and dead leaf tissues could be harvested, and that raised atmospheric CO levels could improve its soil remediation efficiency. Extrapolation of results from experiments of environmental impacts in greenhouse to real scale field requires to be considered cautiously. External factors such as water, temperature, humidity, and pollution are variable in real field. Plants will face a lot of beneficial or detrimental conditions which will influence the magnitude of the results. However, the elevation of CO is an inevitable phenomenon in future. Therefore, findings from experiments under artificial conditions are sometime a good choice to obtain knowledge about elevated CO related impacts on phytoremediation efficiency of a specific plant. The final goal of this work is to find a suitable CO fumigation strategy optimized for soil remediation. We report on that elevated atmospheric CO can increase the phytoremediation efficiency of for Cd. This is significant because the combined influences of elevated atmospheric CO and metal pollution in terms of biomass yield, pollutant uptake, and phytoremediation efficiency would be more complex than the effects of each individual factor.
随着社会经济的发展，土壤中大气 CO 和重金属的浓度不断增加。需要了解植物对土壤污染与气候变化相互作用的生理响应。本研究采用盆栽实验，评估了不同大气 CO 处理下，干重、叶型、叶绿素含量、抗氧化酶活性和 Cd 积累能力的变化。结果表明，随着 CO 浓度的增加，总干重增加，落叶组织中 Cd 浓度随着大气 CO 的升高而增加，在 600 ppm 时达到峰值，之后保持不变。与对照（400 ppm）相比，600、650 和 700 ppm CO 处理分别使落叶组织的比例增加了 1.7%、3.3%和 4.5%。植物叶片中的抗氧化酶活性随大气 CO 浓度的升高而增加。叶片组织中 HO 的浓度随 CO 浓度的增加而增加，在 600 ppm 时达到峰值，随后随着 CO 浓度的进一步增加而显著下降，至 700 ppm。本研究结果表明，可能是 Cd 污染土壤植物修复的潜在候选物；特别是如果能收获衰老和死亡的叶片组织，并且提高大气 CO 水平可以提高其土壤修复效率。需要谨慎考虑从温室环境影响实验中推断到真实田间尺度的结果。在实际田间，水、温度、湿度和污染等外部因素是可变的。植物将面临许多有益或有害的条件，这将影响结果的大小。然而，未来 CO 的升高是不可避免的现象。因此，在人工条件下进行实验的结果有时是获得关于特定植物对 CO 升高相关的植物修复效率影响的知识的良好选择。这项工作的最终目标是找到一种适合土壤修复的 CO 熏蒸策略。我们报告说，大气 CO 的升高可以提高的 Cd 植物修复效率。这一点很重要，因为大气 CO 升高与金属污染的综合影响在生物量产量、污染物吸收和植物修复效率方面将比每个单独因素的影响更为复杂。
