Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; University of the Chinese Academy of Sciences, Beijing 100049, China.
State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing 210093, China.
Sci Total Environ. 2024 Jan 1;906:167627. doi: 10.1016/j.scitotenv.2023.167627. Epub 2023 Oct 6.
Phytoextraction with hyperaccumulators is an environmentally friendly and cost-effective technique for soil remediation but remediation time is largely dependent on experience due to variations in soil properties which restrict the application of this technique. Here, a novel dynamic multi-surface model (MSM) framework is proposed to predict the efficiency and duration of cadmium (Cd) and zinc (Zn) phytoextraction using the hyperaccumulator Sedum plumbizincicola. First, the application of MSM to S. plumbizincicola was investigated using 95 naturally contaminated soils. Using the 'default' settings and considering the pH and DOC content in the rhizosphere, the dissolved Cd/Zn predicted by MSMs showed strong correlations with metal uptake by shoots (R = 0.825/0.802 for Cd/Zn, n = 95) and outperformed chemical extraction methods. Then the MSMs were further integrated with time and Cd and Zn interactions to form dynamic-MSM combined (D-MSM-C) models to evaluate and predict phytoextraction efficiency and duration based on a six-season continuous pot experiment. The D-MSM-C models well predicted metal contents remaining in soils after each season with mean absolute percentage error (MAPE) = 20.4 % (Cd) and 2.46 % (Zn) (n = 66). This model is a powerful tool for assessing and predicting phytoremediation efficiency and duration and is applicable across diverse soil properties and multiple metal-contamination scenarios.
利用超富集植物进行植物提取是一种环保且经济有效的土壤修复技术，但由于土壤性质的变化会限制该技术的应用，因此修复时间在很大程度上取决于经验。在这里，提出了一种新颖的动态多表面模型（MSM）框架，用于预测利用超富集植物垂盆草（Sedum plumbizincicola）进行镉（Cd）和锌（Zn）植物提取的效率和持续时间。首先，使用 95 种天然污染土壤研究了 MSM 在垂盆草中的应用。使用“默认”设置，并考虑根际的 pH 值和 DOC 含量，MSM 预测的溶解态 Cd/Zn 与地上部金属吸收量（Cd/Zn 的 R 值分别为 0.825/0.802，n=95）具有很强的相关性，优于化学提取方法。然后，将 MSM 进一步与时间和 Cd 和 Zn 相互作用相结合，形成动态-MSM 组合（D-MSM-C）模型，以根据六个季节的连续盆栽实验评估和预测植物提取效率和持续时间。D-MSM-C 模型很好地预测了每个季节后土壤中剩余的金属含量，平均绝对百分比误差（MAPE）分别为 20.4%（Cd）和 2.46%（Zn）（n=66）。该模型是评估和预测植物修复效率和持续时间的有力工具，适用于多种土壤性质和多种金属污染情景。
