硫磺在玉米幼芽生物炭上的化学和机械涂层及其在 Pb 污染下对土壤 Pb 有效性、吸收和番茄生长的作用。
Chemical and mechanical coating of sulfur on baby corn biochar and their role in soil Pb availability, uptake, and growth of tomato under Pb contamination.
机构信息
School of Public Administration, Hohai University, Nanjing 211100, China.
Department of Soil Science, Faculty of Agriculture and Environmental Sciences, The Islamia University of Bahawalpur 63100, Pakistan.
出版信息
Environ Pollut. 2023 Dec 1;338:122654. doi: 10.1016/j.envpol.2023.122654. Epub 2023 Sep 29.
In recent ages, industrial revolution and natural weathering processes have been increasing lead (Pb) contamination in agricultural soils, therefore, green remediation technologies are becoming attractive and cost-effective. In the current pot study, 1% and 2% (w/w) application rates of sulfur (S) alone and novel chemo-mechanically S-modified baby corn biochars (CSB and MSB) were applied in a Pb-contaminated (500 mg/kg) soil to evaluate tomato (Lycopersicon esculentum L.) growth, Pb uptake and its soil availability. The results from SEM-EDS and XRD patterns confirmed the S enrichment on the surface of baby-corn biochar. Further, Pb treatment alone imposed a significant reduction in biomass accumulation, photosynthetic pigments, antioxidative mechanism, root traits, and Pb-tolerance index because of increased soil Pb availability and its uptake, translocation and biological accumulation in various tissues of tomato. However, incorporation of lower rate of elemental S (1%) and higher rates of biochars, especially chemically S-modified biochar, CSB (2%) significantly improved dry biomass production, Pb-tolerance index, physiological attributes and antioxidative defense system of tomato plants. These results might be due to a prominent decrease in soil Pb availability by 37.5%, Pb concentration in shoot by 66.7% and root by 58.3%, soil to root transfer by 33.8%, and root to shoot transfer by 20.2% in tomato plants under 2% application rate of CSB, as compared with the Pb treatment without any amendment. Moreover, sulfur treatment induced a significant impact in reduction of soil pH (from 8.97-7.47) as compared to the biochar treatments under Pb-toxicity. The current findings provided an insight that 2% chemically S-modified biochar (CSB) has significant potential to improve the tomato growth by reducing Pb bioavailability in the Pb-contaminated soil, compared to the S alone and MSB amendments.
近年来，工业革命和自然风化过程导致农业土壤中的铅（Pb）污染不断增加，因此，绿色修复技术变得具有吸引力且具有成本效益。在当前的盆栽研究中，单独应用 1%和 2%（w/w）的硫（S）以及新型化学-机械 S 改性玉米芯生物炭（CSB 和 MSB），应用于受 Pb 污染（500mg/kg）的土壤中，以评估番茄（Lycopersicon esculentum L.）的生长、Pb 吸收及其土壤有效性。SEM-EDS 和 XRD 图谱的结果证实了 S 在玉米芯生物炭表面的富集。此外，由于土壤中 Pb 有效性及其在番茄各组织中的吸收、转运和生物积累增加，单独施用 Pb 处理显著降低了生物量积累、光合色素、抗氧化机制、根系特性和 Pb 耐性指数。然而，较低比例的元素 S（1%）和较高比例的生物炭，特别是化学 S 改性生物炭 CSB（2%）的添加，显著提高了番茄植株的干生物量产量、Pb 耐性指数、生理特性和抗氧化防御系统。这些结果可能是由于 2% CSB 处理下土壤中 Pb 的有效性降低了 37.5%，地上部 Pb 浓度降低了 66.7%，根部降低了 58.3%，土壤到根的转移减少了 33.8%，根到地上部的转移减少了 20.2%，而没有任何改良措施的 Pb 处理则减少了 37.5%。此外，与生物炭处理相比，S 处理对降低土壤 pH 值（从 8.97-7.47）有显著影响，在 Pb 毒性下。本研究结果表明，与单独施用 S 和 MSB 相比，2%化学 S 改性生物炭（CSB）在降低 Pb 污染土壤中 Pb 的生物有效性方面具有显著潜力，可改善番茄的生长。
Zotero 插件