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Aims <p>This study evaluates the water use strategies and physiological resilience of three Australian native tree species in saline soils to assess their potential for phytoremediation under climate change. We hypothesise that species with high water demand and delayed stomatal closure under aridity can enhance soil salinity mitigation through sustained transpiration and groundwater regulation.</p> Methods <p>Continuous sap flow measurements were recorded over 12&#xa0;months on nine trees (three per species) from three species across three moderately saline sites in Melbourne, Australia. Detailed analyses of morphological traits, sapwood properties, and soil profiles (including texture and water content) were conducted. Diurnal sap flow patterns, peak flow timing, and physiological responses to temperature and vapour pressure deficit (VPD) were evaluated to determine species-specific thresholds for heat and drought tolerance.</p> Results <p><i>Melaleuca styphelioides</i> exhibited the highest water use, consuming 128% and 97% more water monthly than <i>Lophostemon confertus</i> and <i>Corymbia maculata</i>, respectively. Its peak sap flow occurred later in the day (15:00–17:00), coinciding with sustained stomatal conductance under high VPD (1.9–2.0&#xa0;kPa) and extreme temperatures (41&#xa0;°C). Optimal physiological performance for this species occurred at higher temperatures (32.2–33.4&#xa0;°C) and VPD (1.9–2.0&#xa0;kPa).</p> Conclusions <p><i>Melaleuca styphelioides</i> may warrant further investigation as a potential candidate for water management in saline environments, given its higher water consumption and ability to maintain sap flow under elevated temperature and VPD conditions. These findings suggest that additional research, incorporating larger sample sizes and direct measurements of soil salinity changes, would be valuable to evaluate the suitability of this species for phytoremediation applications in aridifying regions.</p>

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Mechanistic insights into water use strategies and heat tolerance of Australian native trees in saline soils: Implications for phytoremediation under climate change

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月24日

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  • Xi Sun,
  • Jie Li,
  • Mohammad Saberian,
  • Gang Ren,
  • Xin Liu,
  • You Gao

摘要

Aims

This study evaluates the water use strategies and physiological resilience of three Australian native tree species in saline soils to assess their potential for phytoremediation under climate change. We hypothesise that species with high water demand and delayed stomatal closure under aridity can enhance soil salinity mitigation through sustained transpiration and groundwater regulation.

Methods

Continuous sap flow measurements were recorded over 12 months on nine trees (three per species) from three species across three moderately saline sites in Melbourne, Australia. Detailed analyses of morphological traits, sapwood properties, and soil profiles (including texture and water content) were conducted. Diurnal sap flow patterns, peak flow timing, and physiological responses to temperature and vapour pressure deficit (VPD) were evaluated to determine species-specific thresholds for heat and drought tolerance.

Results

Melaleuca styphelioides exhibited the highest water use, consuming 128% and 97% more water monthly than Lophostemon confertus and Corymbia maculata, respectively. Its peak sap flow occurred later in the day (15:00–17:00), coinciding with sustained stomatal conductance under high VPD (1.9–2.0 kPa) and extreme temperatures (41 °C). Optimal physiological performance for this species occurred at higher temperatures (32.2–33.4 °C) and VPD (1.9–2.0 kPa).

Conclusions

Melaleuca styphelioides may warrant further investigation as a potential candidate for water management in saline environments, given its higher water consumption and ability to maintain sap flow under elevated temperature and VPD conditions. These findings suggest that additional research, incorporating larger sample sizes and direct measurements of soil salinity changes, would be valuable to evaluate the suitability of this species for phytoremediation applications in aridifying regions.