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Aims <p>Invasive plants <i>Robinia pseudoacacia</i> are dominant when planted with native <i>Platycladus orientalis</i> in the Loess Plateau. Interactions of trees via belowground factor combinations (BFCs) of soil solution, roots and associated hyphae of arbuscular mycorrhizal fungi (AMF) are important in regulating invasion and coexistence between plants. Therefore, it is necessary to reveal the mechanism of BFC-mediated invasion of <i>R. pseudoacacia</i>.</p> Methods <p>We first collected soils from mixed stands of <i>R. pseudoacacia</i> × <i>P. orientalis</i> (Reshaped-AMF) which had been planted for 13&#xa0;years and nearby native grasslands (Native-AMF) as AMF inocula. Then we conducted a mesocosm experiment with <i>R. pseudoacacia</i> and <i>P. orientalis</i> including three kinds of BFCs. Within each kind of mesocosm, the AMF treatments were inoculation with Reshaped-AMF or Native-AMF; the neighbor treatments contained intraspecific neighbor of <i>R. pseudoacacia</i> and <i>P. orientalis</i> respectively, and interspecific neighbors when two tree species were grown together.</p> Results <p>Compared to its monoculture, the presence of <i>R. pseudoacacia</i> as a neighbor improved the growth of <i>P. orientalis</i>, mainly by increasing root branching and reducing soil hyphal density. Reshaped- AMF significantly decreased the biomass of <i>P. orientalis</i>, but increased the biomass of <i>R. pseudoacacia</i> when interspecific root contact existed. This different response to Reshaped-AMF of <i>R. pseudoacacia</i> and <i>P. orientalis</i> with interspecific root contact could be attributed to root development.</p> Conclusion <p>The soil AMF reshaped by <i>R. pseudoacacia</i> and <i>P. orientalis</i> enhanced the root development of <i>R. pseudoacacia</i> to improve its invasion. This facilitation seemingly took place through root contact.</p>

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Promotion of Robinia pseudoacacia dominance by arbuscular mycorrhizal fungi from mixed stands with Platycladus orientalis depends on belowground factors

  • 期刊论文

  • 发表日期：

    2025年9月14日

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  • Xin Li,
  • Zhaoyang Ye,
  • Min Sheng

摘要

Aims

Invasive plants Robinia pseudoacacia are dominant when planted with native Platycladus orientalis in the Loess Plateau. Interactions of trees via belowground factor combinations (BFCs) of soil solution, roots and associated hyphae of arbuscular mycorrhizal fungi (AMF) are important in regulating invasion and coexistence between plants. Therefore, it is necessary to reveal the mechanism of BFC-mediated invasion of R. pseudoacacia.

Methods

We first collected soils from mixed stands of R. pseudoacacia × P. orientalis (Reshaped-AMF) which had been planted for 13 years and nearby native grasslands (Native-AMF) as AMF inocula. Then we conducted a mesocosm experiment with R. pseudoacacia and P. orientalis including three kinds of BFCs. Within each kind of mesocosm, the AMF treatments were inoculation with Reshaped-AMF or Native-AMF; the neighbor treatments contained intraspecific neighbor of R. pseudoacacia and P. orientalis respectively, and interspecific neighbors when two tree species were grown together.

Results

Compared to its monoculture, the presence of R. pseudoacacia as a neighbor improved the growth of P. orientalis, mainly by increasing root branching and reducing soil hyphal density. Reshaped- AMF significantly decreased the biomass of P. orientalis, but increased the biomass of R. pseudoacacia when interspecific root contact existed. This different response to Reshaped-AMF of R. pseudoacacia and P. orientalis with interspecific root contact could be attributed to root development.

Conclusion

The soil AMF reshaped by R. pseudoacacia and P. orientalis enhanced the root development of R. pseudoacacia to improve its invasion. This facilitation seemingly took place through root contact.