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Aims <p>Temporarily waterlogged soils develop seasonal water tables that can induce hypoxia. Field evidence of how such events affect mature trees remains scarce. We tested <i>in situ</i> whether summer waterlogging influences sap flow density (SFD) in a 54-year-old mixed stand of pedunculate (<i>Quercus robur</i>) and sessile (<i>Quercus petraea</i>) oaks growing on a temporarily waterlogged forest soil.</p> Methods <p>At a site in north-eastern France, we monitored soil moisture down to 110&#xa0;cm depth, water table fluctuations and dissolved oxygen (DO) concentrations. SFD was measured in 18 (2023) and 24 (2024) oaks with Granier sensors. SFD was compared between summer days with waterlogging (WT+) and without waterlogging (WT–).</p> Results <p>The water table was present from late autumn to spring, reaching 12.4 ± 3.0&#xa0;cm (mean ± SE) in depth in 2023 and 8.3 ± 2.4&#xa0;cm in 2024. In summer 2024, three short waterlogging episodes occurred, during which the water table never rose above 29.6 ± 2.7&#xa0;cm below the soil surface. DO declined during waterlogging but reached hypoxic thresholds only for a few hours at the end of summer episodes. SFD did not differ between WT– and WT+ for either species.</p> Conclusion <p>At this site, short-term summer waterlogging episodes below a depth of 30&#xa0;cm did not reduce SFD. This absence of response is consistent with the limited development of hypoxic conditions, suggesting that under such conditions, mature oak stands are unlikely to experience reductions in tree water use.</p>

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Soil water dynamics and sap flow responses in mature oaks (Quercus robur and Quercus petraea) in a temporarily waterlogged forest soil

  • 期刊论文

  • 发表日期：

    2026年4月28日

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  • Aurélien Forler,
  • Damien Bonal,
  • Joseph Levillain,
  • Nathalie Bréda,
  • Arnaud Legout,
  • Sophie Lorentz,
  • Lucas Putigny,
  • François Lebourgeois,
  • Caroline Petitjean

摘要

Aims

Temporarily waterlogged soils develop seasonal water tables that can induce hypoxia. Field evidence of how such events affect mature trees remains scarce. We tested in situ whether summer waterlogging influences sap flow density (SFD) in a 54-year-old mixed stand of pedunculate (Quercus robur) and sessile (Quercus petraea) oaks growing on a temporarily waterlogged forest soil.

Methods

At a site in north-eastern France, we monitored soil moisture down to 110 cm depth, water table fluctuations and dissolved oxygen (DO) concentrations. SFD was measured in 18 (2023) and 24 (2024) oaks with Granier sensors. SFD was compared between summer days with waterlogging (WT+) and without waterlogging (WT–).

Results

The water table was present from late autumn to spring, reaching 12.4 ± 3.0 cm (mean ± SE) in depth in 2023 and 8.3 ± 2.4 cm in 2024. In summer 2024, three short waterlogging episodes occurred, during which the water table never rose above 29.6 ± 2.7 cm below the soil surface. DO declined during waterlogging but reached hypoxic thresholds only for a few hours at the end of summer episodes. SFD did not differ between WT– and WT+ for either species.

Conclusion

At this site, short-term summer waterlogging episodes below a depth of 30 cm did not reduce SFD. This absence of response is consistent with the limited development of hypoxic conditions, suggesting that under such conditions, mature oak stands are unlikely to experience reductions in tree water use.