Abstract. Soil acidification poses a substantial threat to agricultural productivity by releasing salt ions, diminishing soil fertility, and increasing susceptibility to aluminum toxicity. The aim of the study was to investigate the potential improvement of acid yellow soil through the combined application of basalt powder, lime, and polyacrylamide (PAM). Herein, 0.1 g mixed basalt powder and CaO with various proportion were added to 10 g acidic yellow soil with an initial pH of 4.16 to explore the efficient of mixed soil amendments. X-ray fluorescence (XRF) analysis of basalt powder revealed its effectiveness in supplementing soil mineral nutrients. The optimal results of reduced acidification and ion leaching of soil were obtained when the addition proportion of basalt powder to lime was 8/2 and addition ratio of PAM was 0.0002 %. The addition of mixed amendments markedly increased the pH (by up to >2.0 units) and acid-damage capacity (20.3 mmol/kg) of soil, meanwhile decreased the leaching of K⁺(58.1 %), Na⁺(42.9 %), Mg²⁺(26.3 %), and Al³⁺ (below the detectable limit) as shown by the optimal tests. The basalt powder undergoes decomposition in the soil solution, resulting in the formation of some weak acids (i.e., H₂SiO₄), the release of OH^-, and an increase in soil pH. The study reveals the underlying mechanisms of soil remediation with mixed amendment, which has potential guidance for the application of mixed soil amendment and the environment risks prediction of contaminated soil.

中文翻译：

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战胜土壤酸化：玄武岩粉、石灰和 PAM 的协同效应


摘要。土壤酸化会释放盐离子、降低土壤肥力并增加对铝毒性的敏感性，对农业生产力构成重大威胁。本研究的目的是探讨玄武岩粉、石灰和聚丙烯酰胺（PAM）的联合应用对酸性黄土的潜在改良作用。本文将0.1 g混合玄武岩粉和不同比例的CaO添加到10 g初始pH为4.16的酸性黄土中，探讨混合土壤改良剂的效率。玄武岩粉的 X 射线荧光 (XRF) 分析揭示了其补充土壤矿质养分的有效性。当玄武岩粉与石灰的添加比例为8/2、PAM的添加比例为0.0002%时，获得了减少土壤酸化和离子淋洗的最佳效果。混合改良剂的添加显着提高了土壤的pH值（高达>2.0单位）和酸损伤能力（20.3mmol/kg），同时降低了K ⁺ （58.1%）、Na的淋失。最佳测试显示， ⁺ (42.9 %)、Mg ²⁺ (26.3 %) 和 Al ³⁺ （低于可检测限）。玄武岩粉在土壤溶液中分解，形成一些弱酸（即H ₂ SiO ₄ ），释放出OH ^- ，以及土壤 pH 值的增加。该研究揭示了混合改良剂土壤修复的潜在机制，对混合土壤改良剂的应用和污染土壤的环境风险预测具有潜在的指导作用。