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Ozone effects on plants in natural ecosystems.

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Tropospheric ozone (O3) harms ecosystems by affecting plant carbon, nutrient, and water dynamics. Long-term ozone exposure can alter forest species composition, impacting ecological processes globally.

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Area of Science:

  • Ecology
  • Environmental Science
  • Plant Physiology

Background:

  • Tropospheric ozone (O3) is a significant environmental stressor impacting natural ecosystems.
  • Ozone's effects on individual plants scale up to influence ecosystem-level carbon, nutrient, and hydrologic dynamics.
  • Foliar injury from ozone is observed globally, but impacts on plant physiology can occur without visible symptoms.

Purpose of the Study:

  • To assess the impacts of tropospheric ozone on ecosystem processes and plant health.
  • To investigate how ozone sensitivity varies across different plant physiognomic classes.
  • To evaluate the role of stomatal ozone uptake in determining species sensitivity.

Main Methods:

  • Systematic foliar injury surveys across various plant species and global locations.
  • Controlled studies on seedlings and investigations of mature tree radial growth.
  • Modeling of tree physiology and forest stand dynamics to predict long-term ozone impacts.

Main Results:

  • Ozone exposure causes foliar injury in sensitive species and affects plant carbon, water, and nutrient balance, even without visible damage.
  • Ambient ozone has been shown to reduce the growth of mature trees in certain areas.
  • Ozone's effects can be exacerbated by other stressors like drought and nitrogen deposition, potentially altering species interactions and forest composition over time.

Conclusions:

  • Tropospheric ozone poses a significant threat to ecosystem health and function.
  • Ozone's cumulative effects and interactions with other environmental factors can lead to shifts in forest species composition.
  • Continued increases in ozone due to fossil fuel combustion will likely exacerbate these impacts in the future.