化肥对生物炭减轻土壤中镉迁移性效果的影响

Q3 Environmental Science Applied Environmental Research Pub Date : 2024-03-27 DOI:10.35762/aer.2024014
C. Chaiyaraksa, Navapat Sangworn
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引用次数: 0

摘要

这项研究的重点是探索各种肥料如何影响镉在经生物炭处理过的土壤中的移动。研究使用了尖竹汶府的一种强酸性沙质壤土,这种土壤天然富含有机质,阳离子交换能力适中,氮、钾、磷、硫酸盐、盐分和氯化物含量较低。土壤特意受到 50 毫克/千克镉的污染,并用从布袋莲提取的生物炭在 450°C 高温下热解一小时进行处理。这种生物炭显示出适度的碱度、较高的有机质、磷、钾和阳离子交换容量,但氮含量较低。研究人员采用了扫描电子显微镜和傅立叶变换红外光谱等分析技术来研究生物炭的表面特征。在添加镉的土壤中掺入 10%的生物炭和各种化肥,比例为 0.04%。采用二乙烯三胺五乙酸酯(DTPA)萃取法评估土壤中镉对植物的生物利用率,同时采用顺序萃取法确定土壤中存在的不同形式的镉。研究显示,不同的肥料对镉的流动性有不同的影响。46-0-0 和 0-3-0 等肥料会使镉从稳定形式转化为不太稳定的形式,从而增加植物对镉的生物利用率。相反,15-15-15、0-0-50、0-0-60 和 0-52-34 等肥料会使镉从不太稳定的形态转变为更稳定的形态,从而导致 DTPA 提取的镉减少。其他肥料对镉在土壤中的移动性没有明显影响。逐步线性回归分析表明,氮含量、钾含量和导电率是影响镉迁移率的因素。
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The Influence of Chemical Fertilizers on the Effectiveness of Biochar in Mitigating Cadmium Mobility in Soil
The focus of this study was to explore how various fertilizers influence the movement of cadmium in soil treated with biochar. The research utilized a strong acid sandy loam soil from Chanthaburi Province, naturally rich in organic matter with moderate cation exchange capacity and low nitrogen, potassium, phosphorus, sulfate, salinity and chloride levels. The soil was purposely contaminated with 50 mg kg-1 of cadmium and treated with biochar derived from water hyacinth through pyrolysis at 450°C for an hour. This biochar displayed moderate alkalinity, high organic matter, phosphorus, potassium, and cation exchange capacity, but low nitrogen content. Analytical techniques like Scanning Electron Microscopy and Fourier-Transform Infrared Spectroscopy were employed to study the surface characteristics of the biochar. The cadmium adding soil was blended with 10% biochar and various chemical fertilizers at a 0.04% ratio. Diethylenetriamine pentaacetate (DTPA) extraction was used to assess the bioavailability of cadmium to plants in the soil, while sequential extraction was conducted to identify the different forms of cadmium present in the soil. The study revealed distinct effects of different fertilizers on cadmium mobility. Fertilizers like 46-0-0 and 0-3-0 caused a transformation of cadmium from stable to less stable forms, increasing the bioavailability of cadmium to plants. Conversely, fertilizers such as 15-15-15, 0-0-50, 0-0-60, and 0-52-34 shifted cadmium from less stable to more stable forms, resulting in decreased cadmium extracted by DTPA. Other fertilizers showed no significant impact on cadmium mobility in the soil. A stepwise linear regression analysis highlighted that nitrogen content, potassium content, and electrical conductivity were influential factors affecting cadmium mobility.
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来源期刊
Applied Environmental Research
Applied Environmental Research Environmental Science-Environmental Science (all)
CiteScore
2.00
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