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Background and Aims <p>Soil phosphorus (P) availability is pivotal for forest productivity. What subalpine trees seasonally enhance rhizosphere mediated P activation remains unclear.</p> Methods <p>We systematically sampled both bulk (BS) and rhizosphere (RS) soils from the dominant tree species of <i>Abies fabri</i> in the subalpine forests of eastern Tibetan Plateau during the early, middle and late growing seasons, respectively. The P fractions in the soils were analyzed together with low molecular weight organic acids (LMWOAs), phosphatase (ACP), and microbial biomass P (MBP) to reveal the pathways and drivers through which the trees promote soil bioavailable P (Bio-P) within a year.</p> Results <p>Results demonstrated that soil temperature and moisture enhanced the concentrations of Bio-P through the dissolution of inorganic P. In the RS, the increase in Bio-P was driven by the dissolution of inorganic P facilitated by LMWOAs. The rhizosphere also sustained a higher MBP, indicating a larger MBP pool that contributed to P supply. Critically, pathways for replenishing resin-Pi were unique, originating from recalcitrant residual P and organic P (NaOH-Po). In contrast, P dynamics in the BS were primarily governed by abiotic factors such as soil moisture, which influenced P leaching. Hence, available P fractions were derived from less stable pools (NaOH-Po and NaOH-Pi) in rhizosphere soils</p> Conclusion <p><i>Abies fabri</i> actively engineers its rhizosphere, shifting P cycling from abiotic processes to targeted biochemical strategies. By exuding organic acids and fostering a larger microbial biomass, it unlocks recalcitrant P from sources that are inaccessible in the surrounding BS.</p>

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The sources and mobilization processes of rhizosphere bioavailable phosphorus in the subalpine forest of eastern Tibetan Plateau

  • 期刊论文

  • 发表日期：

    2026年1月19日

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  • He Zhu,
  • Haijian Bing,
  • Yanhong Wu,
  • Jun Zhou

摘要

Background and Aims

Soil phosphorus (P) availability is pivotal for forest productivity. What subalpine trees seasonally enhance rhizosphere mediated P activation remains unclear.

Methods

We systematically sampled both bulk (BS) and rhizosphere (RS) soils from the dominant tree species of Abies fabri in the subalpine forests of eastern Tibetan Plateau during the early, middle and late growing seasons, respectively. The P fractions in the soils were analyzed together with low molecular weight organic acids (LMWOAs), phosphatase (ACP), and microbial biomass P (MBP) to reveal the pathways and drivers through which the trees promote soil bioavailable P (Bio-P) within a year.

Results

Results demonstrated that soil temperature and moisture enhanced the concentrations of Bio-P through the dissolution of inorganic P. In the RS, the increase in Bio-P was driven by the dissolution of inorganic P facilitated by LMWOAs. The rhizosphere also sustained a higher MBP, indicating a larger MBP pool that contributed to P supply. Critically, pathways for replenishing resin-Pi were unique, originating from recalcitrant residual P and organic P (NaOH-Po). In contrast, P dynamics in the BS were primarily governed by abiotic factors such as soil moisture, which influenced P leaching. Hence, available P fractions were derived from less stable pools (NaOH-Po and NaOH-Pi) in rhizosphere soils

Conclusion

Abies fabri actively engineers its rhizosphere, shifting P cycling from abiotic processes to targeted biochemical strategies. By exuding organic acids and fostering a larger microbial biomass, it unlocks recalcitrant P from sources that are inaccessible in the surrounding BS.