Journal of Integrative Agriculture ›› 2026, Vol. 25 ›› Issue (8): 3412-3426.DOI: 10.1016/j.jia.2025.10.005

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化肥与石灰调控下铁铝氧化物和土壤有机碳组分的变化及其对红壤旱地碳储量的影响

  

  • 收稿日期:2025-06-06 修回日期:2025-10-15 接受日期:2025-09-03 出版日期:2026-08-20 发布日期:2026-07-09

Chemical fertilizer and liming-induced changes in aluminum, iron oxides and soil organic carbon fractions: Implications for carbon sequestration in an upland red soil

Mahmoud Abdelaziz1, 3*, Zhe Shen1*, Dongchu Li1, 2, Lu Zhang1, 2, Dong Ai1, Jun Yan1, Kiya Adare Tadesse1, 4, Imtiaz Ahmed1, Chu Zhang1, Chunhong Wu1, Jiwen Li1, Huimin Zhang1, 2#   

  1. 1 State Key Laboratory of Efficient Utilization of Arid and Semiarid Arable Land in Northern China, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China

    2 Qiyang Farmland Ecosystem National Observation and Research Station, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Qiyang 426182, China

    3 Department of Soils and Water, Faculty of Agriculture, Assiut University, Assiut 71526, Egypt

    4 School of Plant Sciences, College of Agriculture and Environmental Science, Haramaya University, Dire Dawa 3000, Ethiopia

  • Received:2025-06-06 Revised:2025-10-15 Accepted:2025-09-03 Online:2026-08-20 Published:2026-07-09
  • About author:#Correspondence Huimin Zhang, E-mail: zhanghuimin@caas.cn * These authors contributed equally to this study.
  • Supported by:

    This research was supported by the National Key Research and Development Program of China (2024YFD1900101), the National Natural Science Foundation of China (42477364 and 42207398), the Hengyang Station, Chinese Agrosystem Long-Term Observation Network (CALTON-HY) and the Jinggang Mountains Agricultural High-tech District Provincial Special Science and Technology, China (20222-051246).  

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摘要：

施石灰是常见的土壤酸化改良措施，深入理解其对铁铝氧化物和土壤有机碳（SOC）组分的影响，对于促进红壤旱地碳固存和农业可持续发展具有重要意义。本研究旨在探究长期施化肥和石灰改良下铁铝氧化物与有机碳组分之间的相互关系，及其对有机碳储量的影响。基于红壤旱地长期定位试验，本研究选取CK（不施肥）、N（化学氮肥）、NCa（化学氮肥+石灰）、NPK（化学氮磷钾肥）和NPKCa（化学氮磷钾肥+石灰）共5个田间处理，采集0-0、10-20和20-30 cm三个土层的土壤样品。结果表明，在N处理下，施石灰（NCa）使SOC平均增加了20.84%；但在NPK处理下，施石灰（NPKCa）则使SOC平均降低了9.97%。在0–10 cm土层，NCa和NPKCa的溶解性有机碳（DOC）显著高于CK；而NPK和NPKCa处理的颗粒有机碳（POC）和矿物结合有机碳（MAOC）含量在各土层均显著高于CK。DOC与络合态和游离态铝氧化物含量呈显著正相关（P≤0.05），表明铝氧化物在碳循环中发挥关键作用。与CK相比，SOC储量分别在NPK和NPKCa处理下显著增加了43.49%和36.82%（P≤0.05）。结构方程模型分析显示，施石灰减弱了游离态铝氧化物对有机碳储量的负影响，而增强了游离态铁氧化物对有机碳储量的正向作用。DOC对有机碳固存速率（CSR）无显著影响，而易氧化有机碳（EOC）与CSR呈负相关。综上所述，石灰通过调控铁铝氧化物与SOC组分的相互作用，改善了酸性土壤的碳固存潜力，但其效应受到施肥方式的显著调节。

Abstract:

Lime application represents an established approach for ameliorating soil acidity, and understanding its effects on the interactions between aluminum (Al) and iron (Fe) oxides and soil organic carbon (SOC) fractions is essential for promoting sustainable agricultural practices that enhance carbon sequestration.  This investigation examined the interactions among Al and Fe oxides and SOC fractions under long-term fertilization and liming.  A long-term field experiment was implemented with five treatments: CK (no fertilizer), N (nitrogen fertilizer), NCa (N plus lime), NPK (nitrogen, phosphorus, and potassium fertilizer), and NPKCa (NPK plus lime).  Soil samples were obtained from three depths: 0–10, 10–20, and 20–30 cm.  The findings revealed that lime application increased SOC by 20.84% under the N treatment but decreased SOC by 9.97% under NPK.  At the 0–10 cm depth, dissolved organic carbon (DOC) was substantially higher under NCa (410.51 mg kg–1) and NPKCa (372.83 mg kg–1) compared with CK.  Particulate organic carbon (POC) and mineral-associated organic carbon (MAOC) demonstrated consistent enhancement under NPK and NPKCa across all soil depths compared with CK.  DOC exhibited significant positive correlations with both aluminum (Ald), reactive aluminum (Alo) and aluminum (Alp), indicating a key role of organically bound and reactive Al in carbon dynamics.  Compared to the CK treatment, SOC stock increased significantly by 43.49% under NPK and by 36.82% under NPKCa.  Structural equation modeling demonstrated that lime application mitigated the negative effects of free Al (Ald) on carbon sequestration, while Fe oxides (Fed) contributed positively to SOC stabilization.  DOC showed no significant impact on carbon sequestration rate (CSR), while easily oxidizable carbon (EOC) negatively affected CSR directly.  These results highlight the crucial role of lime in improving acidic soil conditions and enhancing the stability and sequestration of soil organic carbon.

Key words: nitrogen fertilizer , lime ,  carbon fraction ,  carbon sequestration ,  aluminum and iron oxide