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Aims <p>While nitrogen (N) fertilization alters nutrient uptake dynamics in subtropical afforestation tree species, the species-specific adjustments in growth and nutrient-acquisition strategies remain unclear, limiting predictions of their carbon (C) sequestration potential.</p> Methods <p>We investigated seedling responses of three representative species (<i>Pinus massoniana</i>, <i>Schima superba</i>, and <i>Ormosia pinnata</i>) to two-year N addition in a controlled pot experiment. We quantified shifts in rhizosphere microbial communities, carboxylate concentrations, and root morphology, and analyzed their associations with seedling N and phosphorus (P) acquisition.</p> Results <p>N addition increased above- and below-ground biomass as well as N and P uptake in <i>P</i>. <i>massoniana</i> and<i> S</i>. <i>superba</i>, whereas <i>O</i>. <i>pinnata</i> showed no significant growth response. These differences corresponded to contrasting nutrient-acquisition patterns identified by redundancy analysis (RDA). For <i>P. massoniana</i>, enhanced nutrient uptake was&#xa0;primarily associated with&#xa0;rhizosphere carboxylates, whereas in <i>S</i>. <i>superba</i> it was positively correlated with rhizosphere microbial biomass. In contrast, <i>O</i>. <i>pinnata</i> exhibited the highest N and P acquisition capacity despite showing minimal plasticity in its rhizosphere functional traits.&#xa0;Given its identity as a leguminous N-fixing species, symbiotic N-fixation likely offers an alternative strategy for sustained nutrient acquisition.</p> Conclusions <p>Our results demonstrate significant&#xa0;interspecific differences in nutrient-acquisition strategies among these afforestation species, and highlight how root morphology, rhizosphere carboxylates, and microorganisms are differentially associated with nutrient uptake&#xa0;under N fertilization. This study underscores the importance of incorporating species-specific strategies into afforestation management to optimize ecosystem sustainability in subtropical China.</p>

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Species-specific nutrient acquisition strategies in subtropical afforestation tree species under nitrogen fertilization

  • 期刊论文

  • 发表日期：

    2026年5月13日

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  • Sihui Qiu,
  • Ying-Ping Wang,
  • Shiting Xia,
  • Songjia Chen,
  • Jie Li,
  • Zhongbing Chang,
  • Mengxiao Yu,
  • Yinping Tan,
  • Ziqi Liang,
  • Junhua Yan,
  • Jun Jiang

摘要

Aims

While nitrogen (N) fertilization alters nutrient uptake dynamics in subtropical afforestation tree species, the species-specific adjustments in growth and nutrient-acquisition strategies remain unclear, limiting predictions of their carbon (C) sequestration potential.

Methods

We investigated seedling responses of three representative species (Pinus massoniana, Schima superba, and Ormosia pinnata) to two-year N addition in a controlled pot experiment. We quantified shifts in rhizosphere microbial communities, carboxylate concentrations, and root morphology, and analyzed their associations with seedling N and phosphorus (P) acquisition.

Results

N addition increased above- and below-ground biomass as well as N and P uptake in P. massoniana and S. superba, whereas O. pinnata showed no significant growth response. These differences corresponded to contrasting nutrient-acquisition patterns identified by redundancy analysis (RDA). For P. massoniana, enhanced nutrient uptake was primarily associated with rhizosphere carboxylates, whereas in S. superba it was positively correlated with rhizosphere microbial biomass. In contrast, O. pinnata exhibited the highest N and P acquisition capacity despite showing minimal plasticity in its rhizosphere functional traits. Given its identity as a leguminous N-fixing species, symbiotic N-fixation likely offers an alternative strategy for sustained nutrient acquisition.

Conclusions

Our results demonstrate significant interspecific differences in nutrient-acquisition strategies among these afforestation species, and highlight how root morphology, rhizosphere carboxylates, and microorganisms are differentially associated with nutrient uptake under N fertilization. This study underscores the importance of incorporating species-specific strategies into afforestation management to optimize ecosystem sustainability in subtropical China.