Soil Science Department, Faculty of Agriculture, University of Zanjan, Zanjan, Iran.
Centre of Research Impact and Outreach, Institute of Engineering and Technology, Chitkara University, Rajpura, Punjab, 140401, India.
BMC Plant Biol. 2024 May 3;24(1):357. doi: 10.1186/s12870-024-05068-7.
Among different adsorbents, natural and inorganic compounds such as diatomite are important and advantageous in terms of high efficiency and cost-effectiveness, and function in stabilizing heavy metals in the environment. Calendula officinalis, a plant known as a high accumulator of heavy metals, was cultivated in soil treated with varying concentrations of modified diatomite to demonstrate the efficiency of modified diatomite in stabilizating of heavy metals in soils, RESULTS: The modification of diatomite aimed to enhance Calendula officinalis adsorptive properties, particularly towards heavy metals such as lead (Pb), Zinc (Zn), Chromium (Cr), Nickle (Ni), and Copper (Cu), common contaminants in industrial soils. The experimental design included both control and treated soil samples, with assessments at regular intervals. Modified diatomite significantly decreased the bioaccumulation of heavy metals in contaminated soils except Zn, evidenced by decreased DTPA extractable heavy metals in soil and also heavy metal concentrations in plant tissues. Using 10% modified diatomite decreased 91% Pb and Cu, 78% Cr, and 79% Ni concentration of plants compared to the control treatment. The highest concentration of Zn in plant tissue was observed in 2.5% modified diatomite treatment. Remarkably, the application of modified diatomite also appeared to improve the nutrient profile of the soil, leading to enhanced uptake of key nutrients like phosphorus (P) 1.18%, and potassium (K) 79.6% in shoots and 82.3% in roots in Calendula officinalis. Consequently, treated plants exhibited improved growth characteristics, including shoots and roots height of 16.98% and 12.8% respectively, and shoots fresh and dry weight of 48.5% and 50.2% respectively., compared to those in untreated, contaminated soil.
The findings suggest promising implications for using such amendments in ecological restoration and sustainable agriculture, particularly in areas impacted by industrial pollution.
在不同的吸附剂中，天然和无机化合物，如硅藻土，在高效和经济实惠方面具有重要优势，并且可以稳定环境中的重金属。金盏花是一种重金属高积累植物，在不同浓度改性硅藻土处理的土壤中进行种植，以证明改性硅藻土在稳定土壤重金属方面的效率。
硅藻土的改性旨在增强金盏花的吸附特性，特别是对铅（Pb）、锌（Zn）、铬（Cr）、镍（Ni）和铜（Cu）等重金属的吸附，这些重金属是工业土壤中的常见污染物。实验设计包括对照和处理土壤样本，并定期进行评估。改性硅藻土显著降低了受污染土壤中重金属的生物积累，除 Zn 外，这一点可以从土壤中 DTPA 可提取重金属的减少以及植物组织中重金属浓度的降低得到证明。与对照处理相比，使用 10%的改性硅藻土可使植物中 91%的 Pb 和 Cu、78%的 Cr 和 79%的 Ni 浓度降低。在植物组织中观察到的最高 Zn 浓度出现在 2.5%的改性硅藻土处理中。值得注意的是，改性硅藻土的应用似乎也改善了土壤的营养状况，导致金盏花中关键养分如磷（P）的吸收增加 1.18%，钾（K）的吸收增加 79.6%在地上部分和 82.3%在根部。因此，与未经处理的、受污染的土壤相比，处理过的植物表现出更好的生长特性，包括地上部分和根部的高度分别增加了 16.98%和 12.8%，地上部分和根部的鲜重和干重分别增加了 48.5%和 50.2%。
研究结果表明，在生态恢复和可持续农业中使用这种改良剂具有广阔的前景，特别是在受到工业污染影响的地区。
