Fertilized soils enhance the efficiency of phytoremediation by tropical grasses in cadmium-contaminated soils.

IF 3.4 4区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
Jeissica Taline Prochnow Raposo, Enilson de Barros Silva, Iracema Raquel Santos Bezerra, Wesley Costa Silva, Flávio Antônio Fernandes Alves, Lauana Lopes Dos Santos, Caíque Menezes de Abreu
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Abstract

The effectiveness of phytoremediation in Cd-contaminated soils is crucial for enhancing nutrient availability and plant tolerance to Cd. We simulated soil contamination with varying textures and fertilization conditions. Two experiments were conducted: one without liming and fertilization and another with soil fertilization for grasses. The soil types used were Oxisol and Entisol, and the grasses tested were Megathyrsus maximus and Urochloa brizantha at three Cd levels: 0 mg kg-1 (Control), 2 mg kg-1 (Low), and 12 mg kg-1 (High). Soil amendments and fertilization did not significantly change Cd availability. Soil chemical attributes were unaffected by Cd contamination but were influenced by fertilization, which kept the pH below optimal levels. Cd availability was higher in more contaminated soils, with Entisol showing greater concentrations than Oxisol. Dry matter production of the grasses decreased with higher contamination, with U. brizantha being more productive than M. maximus in fertilized soils. Cd accumulation was higher in highly contaminated soils, particularly for U. brizantha. The bioconcentration factor was higher in Entisol, while the translocation factor exceeded 1.0 only for M. maximus in low-contamination Oxisol. Fertilization can mitigate Cd contamination effects, with U. brizantha showing greater tolerance and accumulation capacity in fertilized soils.

施肥土壤可提高热带禾本科植物在镉污染土壤中的植物修复效率。
镉污染土壤的植物修复效果对于提高养分可用性和植物对镉的耐受性至关重要。我们模拟了不同质地和施肥条件下的土壤污染。我们进行了两项实验:一项是不施用石灰和肥料的实验,另一项是施用禾本科土壤肥料的实验。使用的土壤类型为 Oxisol 和 Entisol,测试的禾本科植物为 Megathyrs maximus 和 Urochloa brizantha,镉含量分别为 0 毫克/千克(对照组)、2 毫克/千克(低含量)和 12 毫克/千克(高含量)。土壤改良剂和施肥并没有显著改变镉的可用性。土壤化学属性不受镉污染的影响,但受施肥的影响,施肥使 pH 值低于最佳水平。在受污染较严重的土壤中,镉的可得性较高,其中 Entisol 的浓度高于 Oxisol。污染程度越高,禾本科植物的干物质产量越低,在施肥土壤中,U. brizantha 的产量高于 M. maximus。在高污染土壤中,镉的积累量更高,尤其是 U. brizantha。Entisol 中的生物富集因子较高,而只有低污染 Oxisol 中的 M. maximus 的易位因子超过 1.0。施肥可以减轻镉污染的影响,U. brizantha 在施肥土壤中表现出更强的耐受性和积累能力。
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来源期刊
International Journal of Phytoremediation
International Journal of Phytoremediation 环境科学-环境科学
CiteScore
7.60
自引率
5.40%
发文量
145
审稿时长
3.4 months
期刊介绍: The International Journal of Phytoremediation (IJP) is the first journal devoted to the publication of laboratory and field research describing the use of plant systems to solve environmental problems by enabling the remediation of soil, water, and air quality and by restoring ecosystem services in managed landscapes. Traditional phytoremediation has largely focused on soil and groundwater clean-up of hazardous contaminants. Phytotechnology expands this umbrella to include many of the natural resource management challenges we face in cities, on farms, and other landscapes more integrated with daily public activities. Wetlands that treat wastewater, rain gardens that treat stormwater, poplar tree plantings that contain pollutants, urban tree canopies that treat air pollution, and specialized plants that treat decommissioned mine sites are just a few examples of phytotechnologies.
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