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Seasonal temperature variations influence isoprene emission
Author(s) -
Pétron G.,
Harley P.,
Greenberg J.,
Guenther A.
Publication year - 2001
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2000gl011583
Subject(s) - isoprene , daytime , atmospheric sciences , environmental science , chemistry , botany , biology , physics , organic chemistry , copolymer , polymer
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.