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Aims <p>Nitrogen (N) addition directly alters environmental factors and affects nutrient cycling in forest ecosystems, but the responses of fine root nutrient acquisition strategies and rhizosphere soil phosphorus (P) fractions to N addition in young forest plantations remain unclear.</p> Methods <p>We conducted a N addition experiment (+ N and CK) in three young forest plantations to measure the morphological and nutrient traits of fine root, physicochemical properties and P fractions of rhizosphere soil.</p> Results <p>N addition significantly decreased the specific root length (SRL) and specific root area (SRA) of <i>Fokienia hodginsii</i> (FH), and increased soil acid phosphatase (S-ACP), soil total nitrogen (STN), and soil available phosphorous (AP) of rhizosphere soil. Ligand-P, soluble-P and hydrolyzable-P of rhizosphere soil of <i>Zenia insignis</i> (ZI) increased significantly by 25.16%, 14.93%, and 37.58%, respectively, while exchangeable-P of rhizosphere soil of <i>Machilus pauhoi</i> (MP) increased by 203%. Hydrolyzable-P and exchangeable-P of rhizosphere soil of FH were significantly increased by 41.80% and 14.79%. Redundancy analysis showed that root nitrogen concentration (RNC), root phosphorus concentration (RPC), mycorrhizal infection rates (MIR), pH and AP were the key factors affecting soil P fractions. N addition, soil physicochemical properties and fine root traits affected soil P fractions through different pathways, N addition had the highest total effect on rhizosphere soil P fractions of ZI, MP and FH.</p> Conclusion <p>N addition did not significantly change the strategies of nutrient acquisition by fine roots in young forest plantations, but affected the rhizosphere soil P fractions.</p>

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Nitrogen addition affects the phosphorus fraction of rhizosphere soil in young forest plantations

  • 期刊论文

  • 发表日期：

    2025年6月23日

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  • Liang Fengna,
  • Xu Chaobin,
  • Josep Peñuelas,
  • Jordi Sardans,
  • Li Yuting,
  • Chang Yunni,
  • Cheng Dongliang,
  • Yao Shushu,
  • Zhong Quanlin

摘要

Aims

Nitrogen (N) addition directly alters environmental factors and affects nutrient cycling in forest ecosystems, but the responses of fine root nutrient acquisition strategies and rhizosphere soil phosphorus (P) fractions to N addition in young forest plantations remain unclear.

Methods

We conducted a N addition experiment (+ N and CK) in three young forest plantations to measure the morphological and nutrient traits of fine root, physicochemical properties and P fractions of rhizosphere soil.

Results

N addition significantly decreased the specific root length (SRL) and specific root area (SRA) of Fokienia hodginsii (FH), and increased soil acid phosphatase (S-ACP), soil total nitrogen (STN), and soil available phosphorous (AP) of rhizosphere soil. Ligand-P, soluble-P and hydrolyzable-P of rhizosphere soil of Zenia insignis (ZI) increased significantly by 25.16%, 14.93%, and 37.58%, respectively, while exchangeable-P of rhizosphere soil of Machilus pauhoi (MP) increased by 203%. Hydrolyzable-P and exchangeable-P of rhizosphere soil of FH were significantly increased by 41.80% and 14.79%. Redundancy analysis showed that root nitrogen concentration (RNC), root phosphorus concentration (RPC), mycorrhizal infection rates (MIR), pH and AP were the key factors affecting soil P fractions. N addition, soil physicochemical properties and fine root traits affected soil P fractions through different pathways, N addition had the highest total effect on rhizosphere soil P fractions of ZI, MP and FH.

Conclusion

N addition did not significantly change the strategies of nutrient acquisition by fine roots in young forest plantations, but affected the rhizosphere soil P fractions.