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<p>Application of constructed wetland (CW) treatment for metal influenced waters necessitates effective methods for assessing macrophyte health and function. Using a 40&#xa0;days trial, this study assessed <i>Phragmites australis</i> and <i>Typha latifolia</i> growth under varying Zn concentrations (Control, 0.5, 7, and 14&#xa0;mg/L) using portable chlorophyll content and PAM fluorescence (Y(II), F<sub>v</sub>/F<sub>m</sub>,) metres along with standard physiological parameters and determining shoot Zn content. Chlorophyll content was consistent over time for macrophytes grown under low Zn concentrations (Control and 0.5&#xa0;mg/L Zn) but decreases were recorded for <i>P. australis</i> at ≥ 7&#xa0;mg/L and <i>T. latifolia</i> at 14&#xa0;mg/L Zn. Increased Zn content resulted in decreased macrophyte growth measured by biomass and shoot length, photosynthetic yield (Y(II), F<sub>v</sub>/F<sub>m</sub>,) and chlorophyll content and increased Zn shoot concentrations. Results indicated that <i>T. latifolia</i> was more tolerant to Zn stress than <i>P. australis</i>, displaying symptoms at 14&#xa0;mg/L Zn compared to <i>P. australis</i> at 7&#xa0;mg/L. Both chlorophyll content and PAM fluorescence were strongly associated with biomass, shoot development and Zn concentration in <i>P. australis</i>, with declining chlorophyll content serving as an early warning system for poor plant performance at high Zn levels. Similar correlation associations were observed for <i>T. latifolia</i>, but not to same extent as for <i>P. australis</i>. Findings suggest that portable field meters indicate Zn-induced stress in macrophytes and are a useful tool for management of metal-enriched aquatic environments.</p>

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Field measurement of chlorophyll content and fluorescence offer rapid assessment of potential Zn stress for macrophytes used in constructed wetlands

  • 期刊论文

  • 发表日期：

    2026年7月28日

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  • Nathan Bourke,
  • Audrey O’Grady,
  • Ronan Courtney

摘要

Application of constructed wetland (CW) treatment for metal influenced waters necessitates effective methods for assessing macrophyte health and function. Using a 40 days trial, this study assessed Phragmites australis and Typha latifolia growth under varying Zn concentrations (Control, 0.5, 7, and 14 mg/L) using portable chlorophyll content and PAM fluorescence (Y(II), Fv/Fm,) metres along with standard physiological parameters and determining shoot Zn content. Chlorophyll content was consistent over time for macrophytes grown under low Zn concentrations (Control and 0.5 mg/L Zn) but decreases were recorded for P. australis at ≥ 7 mg/L and T. latifolia at 14 mg/L Zn. Increased Zn content resulted in decreased macrophyte growth measured by biomass and shoot length, photosynthetic yield (Y(II), Fv/Fm,) and chlorophyll content and increased Zn shoot concentrations. Results indicated that T. latifolia was more tolerant to Zn stress than P. australis, displaying symptoms at 14 mg/L Zn compared to P. australis at 7 mg/L. Both chlorophyll content and PAM fluorescence were strongly associated with biomass, shoot development and Zn concentration in P. australis, with declining chlorophyll content serving as an early warning system for poor plant performance at high Zn levels. Similar correlation associations were observed for T. latifolia, but not to same extent as for P. australis. Findings suggest that portable field meters indicate Zn-induced stress in macrophytes and are a useful tool for management of metal-enriched aquatic environments.