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Aims <p>This study examined how soybean genotypes and maize–soybean root interactions influence soil aggregate-associated P dynamics and plant P uptake in maize/soybean intercrops.</p> Methods <p>In a pot experiment lasting eight weeks, two soybean genotypes, YC03-3 (YC, P-efficient) and Essex (Ex, P-inefficient), were intercropped with maize under solid, mesh, or no-root barriers to distinguish the relative contributions of physical versus biochemical root interactions on root morphology, soil aggregation, aggregate-associated biological P pools, and acid phosphatase activity.</p> Results <p>Compared with the solid-barrier treatment, P content in YC significantly increased 1.5–4.0-fold under mesh and no-barrier treatments, with companion maize showing significant increases of 40–50%. In contrast, Ex and its companion maize showed no significant response. In YC, the no-barrier treatment were associated with significantly increased root proliferation, greater aggregate stability, and higher levels of large macroaggregate-associated acid phosphatase and microaggregate-associated resin-P and citrate-P, all closely linked to improved P uptake. By contrast, aggregate stability in Ex appeared to rely more on biochemically mediated processes, with limited effects on aggregate-associated P pools.</p> Conclusions <p>Soybean genotypes regulate soil aggregation, aggregate-associated P dynamics, and plant P uptake through maize–soybean root interactions<i>.</i> The P-efficient genotype YC had the strongest effects, primarily through physical root interactions, suggesting that incorporating soybean genotypes with relatively fine roots and high P-efficiency can improve early-stage P use efficiency and optimize soil structure in intercropping systems.</p>

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Soybean genotypes regulate soil aggregation and associated phosphorus dynamics through maize/soybean root interactions

  • 期刊论文

  • 发表日期：

    2026年2月26日

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  • Jihui Tian,
  • Xing Lu,
  • Tianqi Wang,
  • Xiaohui Zhu,
  • Huiying Zhou,
  • Jinglin Tan,
  • Danyu He,
  • Cuiyue Liang,
  • Jiang Tian

摘要

Aims

This study examined how soybean genotypes and maize–soybean root interactions influence soil aggregate-associated P dynamics and plant P uptake in maize/soybean intercrops.

Methods

In a pot experiment lasting eight weeks, two soybean genotypes, YC03-3 (YC, P-efficient) and Essex (Ex, P-inefficient), were intercropped with maize under solid, mesh, or no-root barriers to distinguish the relative contributions of physical versus biochemical root interactions on root morphology, soil aggregation, aggregate-associated biological P pools, and acid phosphatase activity.

Results

Compared with the solid-barrier treatment, P content in YC significantly increased 1.5–4.0-fold under mesh and no-barrier treatments, with companion maize showing significant increases of 40–50%. In contrast, Ex and its companion maize showed no significant response. In YC, the no-barrier treatment were associated with significantly increased root proliferation, greater aggregate stability, and higher levels of large macroaggregate-associated acid phosphatase and microaggregate-associated resin-P and citrate-P, all closely linked to improved P uptake. By contrast, aggregate stability in Ex appeared to rely more on biochemically mediated processes, with limited effects on aggregate-associated P pools.

Conclusions

Soybean genotypes regulate soil aggregation, aggregate-associated P dynamics, and plant P uptake through maize–soybean root interactions. The P-efficient genotype YC had the strongest effects, primarily through physical root interactions, suggesting that incorporating soybean genotypes with relatively fine roots and high P-efficiency can improve early-stage P use efficiency and optimize soil structure in intercropping systems.