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Background and Aims <p>This study investigated the effects of drought on carbon (C) allocation underground in two evergreen mycorrhizal tree species.</p> Methods <p>Two-year-old <i>Schima superba</i> (AM) and <i>Castanopsis sclerophylla</i> (ECM) seedlings underwent a short-term drought with <sup>13</sup>CO₂ labeling using the in-growth core method to quantify soil C input, with C content and δ<sup>13</sup>C analyzed by elemental analyzer–isotope ratio mass spectrometer.</p> Results <p>Short-term drought had no significant effects on biomass, <sup>13</sup>C concentrations, or soil C allocation in <i>S. superba</i>, whereas for <i>C. sclerophylla</i>, short-term drought decreased the biomass and leaf <sup>13</sup>C concentrations, but enhanced the mycorrhizal colonization by 55.8% and significantly increased the proportion of C allocated to soil by 6.9%. The mycelia-derived C from <i>S. superba</i> contributed a higher proportion of the new C input to soil organic C (SOC) (78.58%), particulate organic C (POC) (69.52%), and mineral-associated organic C (MAOC) (71.58%) than the roots did. However, no significant difference was observed between mycelium- and root-derived C sequestration into SOC in <i>C. sclerophylla</i>. The mycelia-derived C accounted for a higher contribution of the new C input to SOC (72.91%) and POC (69.16%) than roots did for <i>C. sclerophylla</i> under control treatment. Under drought treatment, the new C input to MAOC from mycelium of <i>S. superba</i> was higher than that from <i>C. sclerophylla.</i></p> Conclusion <p>Our findings indicated that under future drought scenarios, AM trees may enhance soil C accumulation through fungal hyphae, whereas the C cycling mediated by ECM trees may be more vulnerable during drought periods.</p>

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Two subtropical mycorrhizal tree species differ in contributions to soil carbon pools under drought

  • 期刊论文

  • 发表日期：

    2026年3月10日

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  • Juan Wang,
  • Mengyang Deng,
  • Yanyan Bian,
  • Yi Li,
  • Sarita Keski-Saari,
  • Qingpei Yang,
  • Jun Liu,
  • Fenggang Luan,
  • Qingni Song,
  • Xin Xiong,
  • Dan Xi,
  • Xiong Fang

摘要

Background and Aims

This study investigated the effects of drought on carbon (C) allocation underground in two evergreen mycorrhizal tree species.

Methods

Two-year-old Schima superba (AM) and Castanopsis sclerophylla (ECM) seedlings underwent a short-term drought with 13CO₂ labeling using the in-growth core method to quantify soil C input, with C content and δ13C analyzed by elemental analyzer–isotope ratio mass spectrometer.

Results

Short-term drought had no significant effects on biomass, 13C concentrations, or soil C allocation in S. superba, whereas for C. sclerophylla, short-term drought decreased the biomass and leaf 13C concentrations, but enhanced the mycorrhizal colonization by 55.8% and significantly increased the proportion of C allocated to soil by 6.9%. The mycelia-derived C from S. superba contributed a higher proportion of the new C input to soil organic C (SOC) (78.58%), particulate organic C (POC) (69.52%), and mineral-associated organic C (MAOC) (71.58%) than the roots did. However, no significant difference was observed between mycelium- and root-derived C sequestration into SOC in C. sclerophylla. The mycelia-derived C accounted for a higher contribution of the new C input to SOC (72.91%) and POC (69.16%) than roots did for C. sclerophylla under control treatment. Under drought treatment, the new C input to MAOC from mycelium of S. superba was higher than that from C. sclerophylla.

Conclusion

Our findings indicated that under future drought scenarios, AM trees may enhance soil C accumulation through fungal hyphae, whereas the C cycling mediated by ECM trees may be more vulnerable during drought periods.