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Background and aims <p>Soil inorganic carbon (SIC) and its dissolved fraction are recognised as dynamic components of the terrestrial carbon (C) cycle. While they contribute to CO<sub>2</sub> dynamics and climate regulation, their short-term responses to plant-driven processes remain poorly understood. This study investigates how growth of a C₃ species (<i>Silphium perfoliatum</i> L.) and a C₄ species (<i>Zea mays</i> L.) affects dissolved inorganic and organic C (DIC/DOC) dynamics in a carbonate-poor soil under varying soil moisture conditions.</p> Methods <p>Leachates taken from a two-week lysimeter experiment were analysed for DIC and DOC concentrations, their isotope ratios (expressed as δ<sup>13</sup>C isotope), pH, and the data obtained were complemented with in situ CO<sub>2</sub> efflux measurements. A two-endmember isotope mixing model was used to evaluate contributions of plant-derived C to the DIC pool.</p> Results <p>DIC concentrations exceeded DOC across all treatments. Increased CO₂ efflux and higher pH values indicated enhanced soil respiration. δ<sup>13</sup>C<sub>DIC</sub> values ranged from –7‰ to –20‰, while δ<sup>13</sup>C<sub>DOC</sub> remained nearly uniform at –29 ± 0.7‰. Isotope mixing considerations suggested that up to 62% of DIC could be derived from C₄ plant sources.</p> Conclusion <p>Root and rhizomicrobial respiration may measurably influence short-term DIC dynamics in carbonate-poor soils. These findings suggest that DIC fluxes could play a more prominent role in soil C cycling than currently assumed, particularly over short temporal scales.</p>

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Short-term influences of C4 versus C3 plant growth on dissolved inorganic carbon in a carbonate-poor soil

  • 期刊论文

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  • 发表日期：

    2026年1月8日

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  • Visser Anna-Neva,
  • Abdalla Khatab,
  • Lauerer Marianne,
  • Pausch Johanna,
  • Barth Johannes A.C.

摘要

Background and aims

Soil inorganic carbon (SIC) and its dissolved fraction are recognised as dynamic components of the terrestrial carbon (C) cycle. While they contribute to CO2 dynamics and climate regulation, their short-term responses to plant-driven processes remain poorly understood. This study investigates how growth of a C₃ species (Silphium perfoliatum L.) and a C₄ species (Zea mays L.) affects dissolved inorganic and organic C (DIC/DOC) dynamics in a carbonate-poor soil under varying soil moisture conditions.

Methods

Leachates taken from a two-week lysimeter experiment were analysed for DIC and DOC concentrations, their isotope ratios (expressed as δ13C isotope), pH, and the data obtained were complemented with in situ CO2 efflux measurements. A two-endmember isotope mixing model was used to evaluate contributions of plant-derived C to the DIC pool.

Results

DIC concentrations exceeded DOC across all treatments. Increased CO₂ efflux and higher pH values indicated enhanced soil respiration. δ13CDIC values ranged from –7‰ to –20‰, while δ13CDOC remained nearly uniform at –29 ± 0.7‰. Isotope mixing considerations suggested that up to 62% of DIC could be derived from C₄ plant sources.

Conclusion

Root and rhizomicrobial respiration may measurably influence short-term DIC dynamics in carbonate-poor soils. These findings suggest that DIC fluxes could play a more prominent role in soil C cycling than currently assumed, particularly over short temporal scales.