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Purpose <p>Phosphorus (P) is an essential limiting nutrient for plant growth in the red soils of southern China. Understanding how intercropping affects soil P fractions and availability is crucial for maintaining P demand in <i>Camellia oleifera</i> agroforestry systems.</p> Materials and methods <p>The effects of intercropping on the soil P fractions, availability and <i>phoD</i>-harbouring bacteria community were investigated in three plantation types: <i>C. oleifera</i> monoculture (CK), <i>C. oleifera</i> intercropped with <i>Capsicum annuum L</i> (CC), and <i>C. oleifera</i> intercropped with <i>Arachis hypogaea L</i> (CA).</p> Results and discussion <p>Intercropping significantly changed P fractions and availability. CA increased the NaHCO<sub>3</sub>-Po content but decreased the NaOH-Po content, while CC enhanced the NaOH-Pi content compared to CK. Additionally, CA increased the RAP content by 34.3%, whereas the CC depressed the NAP content by 40.4% compared to CK. Molecular analysis revealed that intercropping significantly altered the diversity of <i>phoD</i>-harbouring bacterial community. Correlation analysis showed that the Pi fractions were positively correlated with <i>phoD</i>-harbouring bacteria such as <i>Oxalobacteraceae</i>, <i>Pseudonocardiaceae</i> and <i>Streptomycetaceae</i>. However, the Po fraction (NaHCO<sub>3</sub>-Po) was significantly negatively correlated with the Chao1 index. RAP was significantly associated with NO<sub>3</sub><sup>–</sup>-N, the Chao1 index, <i>Burkholderiaceae</i> and <i>Micromonosporaceae</i>. MAP was significantly positively correlated with the Chao1 index and <i>Burkholderiaceae</i> but negatively correlated with <i>Bradyrhizobiaceae</i>.</p> Conclusions <p>The changes in P fractions and availability were driven by alterations in the <i>phoD</i>-harbouring bacterial community and soil physicochemical properties in the intercropping systems. Intercropping with Arachis hypogaea L was particularly effective in enhancing P availability, suggesting that this practice could be a planting strategy worthy of greater promotion in <i>C. oleifera</i> plantation.</p>

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Intercropping changed soil phosphorus fractions and bacterial communities in Camellia oleifera plantations

  • 期刊论文

  • 发表日期：

    2025年7月17日

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  • Xiaoying Lv,
  • Wenqiong Jiang,
  • Fen He,
  • Yuxin Yao,
  • Jinsong He,
  • Yazhen Chen,
  • Xiaohong Wu,
  • Wende Yan

摘要

Purpose

Phosphorus (P) is an essential limiting nutrient for plant growth in the red soils of southern China. Understanding how intercropping affects soil P fractions and availability is crucial for maintaining P demand in Camellia oleifera agroforestry systems.

Materials and methods

The effects of intercropping on the soil P fractions, availability and phoD-harbouring bacteria community were investigated in three plantation types: C. oleifera monoculture (CK), C. oleifera intercropped with Capsicum annuum L (CC), and C. oleifera intercropped with Arachis hypogaea L (CA).

Results and discussion

Intercropping significantly changed P fractions and availability. CA increased the NaHCO3-Po content but decreased the NaOH-Po content, while CC enhanced the NaOH-Pi content compared to CK. Additionally, CA increased the RAP content by 34.3%, whereas the CC depressed the NAP content by 40.4% compared to CK. Molecular analysis revealed that intercropping significantly altered the diversity of phoD-harbouring bacterial community. Correlation analysis showed that the Pi fractions were positively correlated with phoD-harbouring bacteria such as Oxalobacteraceae, Pseudonocardiaceae and Streptomycetaceae. However, the Po fraction (NaHCO3-Po) was significantly negatively correlated with the Chao1 index. RAP was significantly associated with NO3–-N, the Chao1 index, Burkholderiaceae and Micromonosporaceae. MAP was significantly positively correlated with the Chao1 index and Burkholderiaceae but negatively correlated with Bradyrhizobiaceae.

Conclusions

The changes in P fractions and availability were driven by alterations in the phoD-harbouring bacterial community and soil physicochemical properties in the intercropping systems. Intercropping with Arachis hypogaea L was particularly effective in enhancing P availability, suggesting that this practice could be a planting strategy worthy of greater promotion in C. oleifera plantation.