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Related Experiment Videos

Temporal variability in basal isoprene emission factor.

Chris Geron1, Alex Guenther, Tom Sharkey

  • 1United States Environmental Protection Agency, National Risk Management Research Laboratory, Research Triangle Park, NC 27711, USA.

Tree Physiology
|March 26, 2003
PubMed
Summary

This study tracked seasonal isoprene emissions from white oak leaves, finding that environmental conditions like photosynthetically active radiation (PAR) and temperature significantly influenced emission rates throughout the growing season.

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Area of Science:

  • Biogeochemistry
  • Plant Physiology
  • Atmospheric Chemistry

Background:

  • Isoprene is a volatile organic compound emitted by plants, influencing atmospheric chemistry.
  • Understanding seasonal variability in isoprene emission factors (EF) is crucial for atmospheric modeling.
  • White oak (Quercus alba L.) is a significant contributor to isoprene emissions in temperate forests.

Purpose of the Study:

  • To investigate the seasonal variability of basal isoprene emission factors in white oak leaves.
  • To determine the influence of meteorological conditions on isoprene emissions throughout the growing season.
  • To establish relationships between environmental factors and isoprene emission rates.

Main Methods:

  • Seasonal measurements of isoprene emissions from white oak leaves at Duke Forest, NC.

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  • Utilized a controlled-environment cuvette system for basal and ambient emission measurements.
  • Adjusted ambient measurements to basal conditions using established algorithms for PAR and leaf temperature.

    • Main Results:

    • Isoprene emission onset correlated with cumulative degree days, indicating seasonal timing.
    • Meteorological conditions (PAR, temperature) explained up to 78% of basal EF variability between May and August.
    • Summer mean isoprene emission potential was maintained from May to August, declining with leaf senescence.

    Conclusions:

    • Seasonal patterns of isoprene emission are strongly linked to environmental factors and plant phenology.
    • Meteorological conditions preceding measurements significantly impact observed isoprene emission factors.
    • Further research is needed to explore diurnal variations and the general applicability of derived empirical equations.