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Aims <p>The projected increase in drought intensity and frequency due to climate change is expected to exert sustained pressure on forest survival and growth in southern China. However, it remains unclear how plants adjust their water-use strategies and competitive mechanisms in response to water scarcity, as well as the effectiveness of these adaptations in mitigating drought-induced physiological stress.</p> Methods <p>In this study, we used water stable isotopes and sap flow measurements to evaluate the adjustment of water-use patterns and interspecific interactions in response to seasonal drought for two widespread species, <i>Cinnamomum camphora</i> and <i>Ligustrum lucidum</i>, in a subtropical secondary forest. The contribution of water from different soil depths was estimated using a Bayesian isotope mixing model.</p> Results <p>Both target species exhibited reduced sensitivity to atmospheric water demand and decreased water uptake from topsoil during drought. Although the two species showed temporary hydrological niche segregation and extracted more water from deep soil water to varying extent during drought, the water stress on plant transpiration was not effectively alleviated This is likely related to the fine root vertical distribution and intense local soil hydrological conditions.</p> Conclusion <p>Our results underscore the drought sensitivity and vulnerability of <i>C. camphora</i> and <i>L. lucidum</i> and the pressure of water resources induced by unique local environment conditions in subtropical secondary forests. These findings provide valuable insights into future forest management and species selection in plantation restoration efforts.</p>

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Deep soil moisture has limited impact on mitigating drought stress effects on plant transpiration in a subtropical secondary forest

  • 期刊论文

  • 发表日期：

    2025年3月26日

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  • Ji Zhang,
  • Na Liu,
  • Cicheng Zhang,
  • Xinping Zhang,
  • Xinguang He,
  • Wulin Jiang,
  • Jiajie Li,
  • Ziwei Zhan,
  • Dejing Peng,
  • Dongjie Lv,
  • Suixia Ni

摘要

Aims

The projected increase in drought intensity and frequency due to climate change is expected to exert sustained pressure on forest survival and growth in southern China. However, it remains unclear how plants adjust their water-use strategies and competitive mechanisms in response to water scarcity, as well as the effectiveness of these adaptations in mitigating drought-induced physiological stress.

Methods

In this study, we used water stable isotopes and sap flow measurements to evaluate the adjustment of water-use patterns and interspecific interactions in response to seasonal drought for two widespread species, Cinnamomum camphora and Ligustrum lucidum, in a subtropical secondary forest. The contribution of water from different soil depths was estimated using a Bayesian isotope mixing model.

Results

Both target species exhibited reduced sensitivity to atmospheric water demand and decreased water uptake from topsoil during drought. Although the two species showed temporary hydrological niche segregation and extracted more water from deep soil water to varying extent during drought, the water stress on plant transpiration was not effectively alleviated This is likely related to the fine root vertical distribution and intense local soil hydrological conditions.

Conclusion

Our results underscore the drought sensitivity and vulnerability of C. camphora and L. lucidum and the pressure of water resources induced by unique local environment conditions in subtropical secondary forests. These findings provide valuable insights into future forest management and species selection in plantation restoration efforts.