Seasonal temperature variations influence isoprene emission

Details Seasonal temperature variations influence isoprene emission Seasonal temperature variations influence isoprene emission

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.1707p&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 9, p. 1707-1710

Physics

26

Atmospheric Composition And Structure: Biosphere/Atmosphere Interactions, Global Change: Biogeochemical Processes

Scientific paper

Isoprene (2-methyl-1,3-butadiene) emission from plants is highly temperature dependent. The influence of long-term variations in growth temperature on isoprene emission rates from bur oak (Quercus macrocarpa) leaves was investigated under controlled environmental conditions. Trees were installed in a growth chamber and exposed to a series of daytime temperatures that were varied after a period of 3-6 weeks. Emission capacity (measured at leaf temperature of 25°C and photosynthetic photon flux density of 900 μmol m-2 s-1) doubled when growth temperature was increased from 25 to 30°C. Ten days after the growth temperature was decreased to 20°C, isoprene emission capacity fell to 25 to 50% of its peak value. When growth temperature was returned to 30°C, emission capacity doubled within 5 hours and continued to increase over several days. The observed behavior can be described by modifying existing algorithms.

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