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Background and aims <p>Shrubs like <i>Vaccinium vitis-idaea</i> substantially contribute to forest carbon&#xa0;(C) sequestration. Therefore, understanding their allocation patterns under climate change is crucial. We conducted a translocation experiment with <sup>13</sup>CO<sub>2</sub> pulse-labelling to test if (I) belowground pools accumulate total and recently assimilated C, (II) within fine roots, assimilated C is preferentially allocated to root tips and mycorrhized cells and (III), whether warming alters C allocation patterns.</p> Methods <p>We translocated soil cores with <i>V. vitis-idaea</i> from North- to South-Finland (+ 3.7&#xa0;°C mean temperature). After 2.5&#xa0;years, we excavated and pulse-labelled them with <sup>13</sup>CO<sub>2</sub>, tracing the <sup>13</sup>C in plant, soil, and respiration. We used laser-ablation isotope ratio mass spectrometry to examine <sup>13</sup>C distribution in fine roots.</p> Results <p>Roots represented the largest plant C&#xa0;pool (north: 49.69 ± 9.73%, translocated: 43.92 ± 6.59%&#xa0;of plant C stock). A substantial amount of recently assimilated <sup>13</sup>C was recovered belowground (roots + soil, north: 15.59 ±&#xa0;5.77%, translocated: 39.21 ± 29.32%) 8&#xa0;days after labelling. Most assimilated C was respired (north: 63.3 ± 5.9%, translocated: 44.1 ± 3.2%) or recovered in leaves (north: 17.9 ± 5.92%, translocated: 19.2 ± 3.19%). Within fine roots, <sup>13</sup>C content tended to be higher at root tips, while mycorrhizal infection had no effect. Warming tended to increase C allocation to the shoot and significantly decreased <sup>13</sup>C in the microbial biomass in the mineral soil.</p> Conclusion <p><i>V. vitis-idaea</i> allocates a large portion of assimilates belowground, but 2.5&#xa0;years of warming only marginally change C allocation patterns. Accelerated soil microbial processes after translocation may increase plant N availability, potentially affecting C allocation over longer time spans.</p>

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Fate of recently assimilated carbon in the soil–plant system of Vaccinium vitis-idaea and its response to warming in a 2.5-year translocation experiment

  • 期刊论文

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  • 发表日期：

    2025年12月2日

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  • Valentin B. Kurbel,
  • Outi-Maaria Sietiö,
  • Kristiina Karhu,
  • Andrei Rodionov,
  • Sari Timonen,
  • Thomas Ohnemus,
  • Eva Lehndorff,
  • Johanna Pausch,
  • Nele Meyer

摘要

Background and aims

Shrubs like Vaccinium vitis-idaea substantially contribute to forest carbon (C) sequestration. Therefore, understanding their allocation patterns under climate change is crucial. We conducted a translocation experiment with 13CO2 pulse-labelling to test if (I) belowground pools accumulate total and recently assimilated C, (II) within fine roots, assimilated C is preferentially allocated to root tips and mycorrhized cells and (III), whether warming alters C allocation patterns.

Methods

We translocated soil cores with V. vitis-idaea from North- to South-Finland (+ 3.7 °C mean temperature). After 2.5 years, we excavated and pulse-labelled them with 13CO2, tracing the 13C in plant, soil, and respiration. We used laser-ablation isotope ratio mass spectrometry to examine 13C distribution in fine roots.

Results

Roots represented the largest plant C pool (north: 49.69 ± 9.73%, translocated: 43.92 ± 6.59% of plant C stock). A substantial amount of recently assimilated 13C was recovered belowground (roots + soil, north: 15.59 ± 5.77%, translocated: 39.21 ± 29.32%) 8 days after labelling. Most assimilated C was respired (north: 63.3 ± 5.9%, translocated: 44.1 ± 3.2%) or recovered in leaves (north: 17.9 ± 5.92%, translocated: 19.2 ± 3.19%). Within fine roots, 13C content tended to be higher at root tips, while mycorrhizal infection had no effect. Warming tended to increase C allocation to the shoot and significantly decreased 13C in the microbial biomass in the mineral soil.

Conclusion

V. vitis-idaea allocates a large portion of assimilates belowground, but 2.5 years of warming only marginally change C allocation patterns. Accelerated soil microbial processes after translocation may increase plant N availability, potentially affecting C allocation over longer time spans.