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A CO2 Concentration Gradient Facility for Testing CO2 Enrichment and Soil Effects on Grassland Ecosystem Function
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Lower grass stomatal conductance under elevated CO2 can decrease transpiration and evapotranspiration rates despite

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Elevated carbon dioxide (CO2) levels significantly reduce plant transpiration and evapotranspiration (ET) in ryegrass. This decrease in water loss can impact soil moisture and potentially increase flooding risks.

Keywords:
biomassclimate changecontrolled chamber experimentselevated CO2evapotranspirationperennial ryegrass

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Area of Science:

  • Plant Physiology and Environmental Science
  • Ecology and Hydrology

Background:

  • Rising atmospheric carbon dioxide (CO2) concentrations influence plant physiological processes.
  • Key plant responses include enhanced photosynthesis and reduced stomatal conductance, affecting water use.
  • Understanding the net impact on plant transpiration and evapotranspiration (ET) is crucial for hydrological cycle assessments.

Purpose of the Study:

  • To investigate the net effect of elevated CO2 on perennial ryegrass (Lolium perenne) transpiration and ET.
  • To integrate physiological measurements with hydrological water budget methods in a controlled environment.

Main Methods:

  • Controlled environment study on perennial ryegrass.
  • Measurement of net photosynthetic rate, stomatal conductance, transpiration rate, leaf mass per area, and aboveground biomass.
  • Comparison of physiological and water balance components under ambient versus elevated CO2 conditions.

Main Results:

  • Elevated CO2 significantly decreased whole-plant transpiration rates by 38% and stomatal conductance by 57% in the final week.
  • Despite a slight increase in aboveground biomass, overall evapotranspiration (ET) declined under elevated CO2.
  • CO2-mediated suppression of transpiration directly impacts the plant's overall water balance.

Conclusions:

  • Elevated CO2 levels lead to reduced water loss in ryegrass through decreased transpiration.
  • Declines in ET from ryegrass-dominated areas could increase soil moisture and groundwater recharge.
  • Potential implications include increased surface runoff and flooding, highlighting the need for further research with larger sample sizes.