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Monoterpene emission from ponderosa pineWe explore the variability in monoterpene emissions from ponderosa pine beyond that which can be explained by temperature alone. Specifically, we examine the roles that photosynthesis and needle monoterpene concentrations play in controlling emissions. We measure monoterpene concentrations and emissions, photosynthesis, temperature, and light availability in the late spring and late summer in a ponderosa pine forest in central Oregon. We use a combination of measurements from cuvettes and Teflon bag enclosures to show that photosynthesis is not correlated with emissions in the short term. We also show that needle monoterpene concentrations are highly correlated with emissions for two compounds, alpha-pinene and beta-pinene, but that Delta-carene concentrations are not correlated with emissions. We suggest that direct effects of light and photosynthesis do not need to be included in emission algorithms. Our results indicate that the role of needle concentration bears further investigation; our results for alpha-pinene and beta-pinene are explainable by a Raoult's law relationship, but we cannot yet explain the cause of our results with Delta-carene.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Lerdau, Manual
(Stanford Univ. Standford, CA, United States)
Dilts, Stephen B.
(Washington State Univ. Pullman, WA, United States)
Westberg, Hal
(Washington State Univ. Pullman, WA, United States)
Lamb, Brian K.
(Washington State Univ. Pullman, WA, United States)
Allwine, Eugene J.
(Washington State Univ. Pullman, WA, United States)
Date Acquired
August 16, 2013
Publication Date
August 20, 1994
Publication Information
Publication: Journal of Geophysical Research
Volume: 99
Issue: D8
ISSN: 0148-0227
Subject Category
Environment Pollution
Accession Number
Funding Number(s)
Distribution Limits

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