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Purpose <p>The effect of iron oxides and soil organic binding agents on soil aggregation was controversial in Alfisols. Quantifying the contribution of binding materials on soil aggregation would help us to figure out the mechanisms of soil erosion in Alfisols during <i>Citrus sinensis</i> cultivation.</p> Methods <p>Soil samples were collected from four citrus cultivation systems: one without <i>C. sinensis</i> cultivation and three systems with <i>C. sinensis</i> cultivation for durations of three, nine, and sixteen years in Alfisols. The content of iron oxides and soil organic binding agents in different size soil aggregates at the depth of 0–40&#xa0;cm were detected.</p> Results <p>The results demonstrated that <i>C. sinensis</i> cultivation significantly decreased the percentage of soil water-stable aggregates in size &gt; 2&#xa0;mm at the depth of 0–10&#xa0;cm, and increased soil macroaggregate stability at the depth of 10–40&#xa0;cm. The content of soil organic binding materials was significantly higher at the depth of 0–10&#xa0;cm and decreased significantly with the extended years of <i>C. sinensis</i> cultivation. Compared with iron oxides, the contribution of soil organic binding materials to soil aggregation were more notable in soil water-stable macroaggregates.</p> Conclusion <p><i>C. sinensis</i> cultivation altered the distribution and content of soil binding materials in different size soil aggregates, and higher soil organic binding materials at the topsoil were benefit to the formation and stability of soil aggregates. These results enhanced our understanding of the stabilization mechanisms of soil water-stable aggregates in Alfisols and provided an insight into governing soil structure in southern China.</p>

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The glomalin-related soil proteins and iron oxides could jointly contribute to soil aggregation in Alfisols under citrus cultivation

  • 期刊论文

  • 发表日期：

    2026年5月28日

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  • Lingling Ji,
  • Songtao Li,
  • Hongguang Liu,
  • Qiuping Liao,
  • Xiangming Xu,
  • Xingui Liu

摘要

Purpose

The effect of iron oxides and soil organic binding agents on soil aggregation was controversial in Alfisols. Quantifying the contribution of binding materials on soil aggregation would help us to figure out the mechanisms of soil erosion in Alfisols during Citrus sinensis cultivation.

Methods

Soil samples were collected from four citrus cultivation systems: one without C. sinensis cultivation and three systems with C. sinensis cultivation for durations of three, nine, and sixteen years in Alfisols. The content of iron oxides and soil organic binding agents in different size soil aggregates at the depth of 0–40 cm were detected.

Results

The results demonstrated that C. sinensis cultivation significantly decreased the percentage of soil water-stable aggregates in size > 2 mm at the depth of 0–10 cm, and increased soil macroaggregate stability at the depth of 10–40 cm. The content of soil organic binding materials was significantly higher at the depth of 0–10 cm and decreased significantly with the extended years of C. sinensis cultivation. Compared with iron oxides, the contribution of soil organic binding materials to soil aggregation were more notable in soil water-stable macroaggregates.

Conclusion

C. sinensis cultivation altered the distribution and content of soil binding materials in different size soil aggregates, and higher soil organic binding materials at the topsoil were benefit to the formation and stability of soil aggregates. These results enhanced our understanding of the stabilization mechanisms of soil water-stable aggregates in Alfisols and provided an insight into governing soil structure in southern China.