含磷插层Mg/ Fe层状双金属氢氧化物改性生物炭复合材料在酸化土壤中的应用
The application of Mg/Fe-layered double hydroxide modified biochar composite in corn planting in acidified soil
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摘要: 土壤酸化的日益严峻严重影响作物的生长发育,从而导致其产量与品质降低,而农业中不合理的化肥使用会导致土壤酸化加剧。本研究将含磷插层的Mg/ Fe层状双金属氢氧化物改性生物炭(MgFe-LDH/BC-P)复合材料以不同比例(1‰,2‰,3‰和6‰)与化肥混施到土壤中进行玉米盆栽实验,作为土壤改良剂考察其对酸化土壤的改良效果及对氮素利用的影响。研究表明,MgFe-LDH/BC-P与化肥混合施入后,土壤pH值、电导率(EC)、有机质、有效磷含量显著性提高,交换性酸减少,玉米植株的株高、茎粗、叶绿素相对含量(SPAD)和氮磷钾的积累量也随之提高,且随着施用比例增大而变化显著,有效的提高了植株对氮素的利用率。此外,MgFe-LDH/BC-P与化肥混施还可改善土壤微生物的群落结构并提高Alpha多样性。综上,MgFe-LDH/BC-P施用于酸化土壤后,可以有效改良酸性土壤的理化及微生物性质,但其对酸化土壤的长效缓解效果及机制有待进一步探究。Abstract: The increasingly severe of soil acidification seriously affects crop growth, thereby reducing their yield and quality. Unreasonable use of chemical fertilizers in agriculture may exacerbates soil acidification. In this study, Mg/Fe-layered double hydroxides modified phosphorus-intercalated biochar composite (MgFe-LDH/BC-P) was mixed with chemical fertilizers at different proportions (1‰, 2‰, 3‰, and 6‰), and then applied as a soil conditioner in maize pot experiments to investigate its remediation effect on acidified soil and its impact on nitrogen utilization efficiency. The results demonstrated that after the application of MgFe-LDH/BC-P mixing with chemical fertilizers, soil pH, electrical conductivity (EC), organic matter content, and available phosphorus content were significantly increased, while exchangeable acidity was reduced. The plant height, stem diameter, Relative chlorophyll content (SPAD), and accumulation of nitrogen, phosphorus, and potassium in maize plants also increased, and these were significant changes with the increase of MgFe-LDH/BC-P application proportion, effectively improving the nitrogen utilization efficiency. Additionally, the mixture of MgFe-LDH/BC-P and chemical fertilizers improved soil microbial community structure and enhanced Alpha diversity. In conclusion, MgFe-LDH/BC-P applied to acidified soil can effectively improve the physicochemical and microbial properties of acidic soil. However, its long-term alleviation effect and mechanism on acidified soil require further investigation.
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