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Chemosphere

Title:		Large drought-induced variations in oak leaf volatile organic compound emissions during PINOT NOIR 2012
Author(s):		Geron C; Daly R; Harley P; Rasmussen R; Seco R; Guenther A; Karl T; Gu L;
Address:		"U.S. Environmental Protection Agency, National Risk Management Research Laboratory, Research Triangle Park, NC 27711, USA. Electronic address: geron.chris@epa.gov. U.S. Environmental Protection Agency, National Risk Management Research Laboratory, Research Triangle Park, NC 27711, USA. National Center for Atmospheric Research, Boulder, CO, USA. Oregon Graduate Institute, Portland, OR, USA. Department of Earth System Science, University of California, Irvine, CA 92697, USA. Institute for Meteorology and Geophysics, University of Innsbruck, Innsbruck, Austria. Oak Ridge National Laboratory, Oak Ridge, TN, USA"
Journal Title:		Chemosphere
Year:		2016
Volume:		20151217
Issue:
Page Number:		8 - 21
DOI:		10.1016/j.chemosphere.2015.11.086
ISSN/ISBN:		1879-1298 (Electronic) 0045-6535 (Linking)
Abstract:		"Leaf-level isoprene and monoterpene emissions were collected and analyzed from five of the most abundant oak (Quercus) species in Central Missouri's Ozarks Region in 2012 during PINOT NOIR (Particle Investigations at a Northern Ozarks Tower - NOx, Oxidants, Isoprene Research). June measurements, prior to the onset of severe drought, showed isoprene emission rates and leaf temperature responses similar to those previously reported in the literature and used in Biogenic Volatile Organic Compound (BVOC) emission models. During the peak of the drought in August, isoprene emission rates were substantially reduced, and response to temperature was dramatically altered, especially for the species in the red oak subgenus (Erythrobalanus). Quercus stellata (in the white oak subgenus Leucobalanus), on the other hand, increased its isoprene emission rate during August, and showed no decline at high temperatures during June or August, consistent with its high tolerance to drought and adaptation to xeric sites at the prairie-deciduous forest interface. Mid-late October measurements were conducted after soil moisture recharge, but were affected by senescence and cooler temperatures. Isoprene emission rates were considerably lower from all species compared to June and August data. The large differences between the oaks in response to drought emphasizes the need to consider BVOC emissions at the species level instead of just the whole canopy. Monoterpene emissions from Quercus rubra in limited data were highest among the oaks studied, while monoterpene emissions from the other oak species were 80-95% lower and less than assumed in current BVOC emission models. Major monoterpenes from Q. rubra (and in ambient air) were p-cymene, alpha-pinene, beta-pinene, d-limonene, gamma-terpinene, beta-ocimene (predominantly1,3,7-trans-beta-ocimene, but also 1,3,6-trans-beta-ocimene), tricyclene, alpha-terpinene, sabinene, terpinolene, and myrcene. Results are discussed in the context of canopy flux studies conducted at the site during PINOT NOIR, which are described elsewhere. The leaf isoprene emissions before and during the drought were consistent with above canopy fluxes, while leaf and branch monoterpene emissions were an order of magnitude lower than the observed above canopy fluxes, implying that other sources may be contributing substantially to monoterpene fluxes at this site. This strongly demonstrates the need for further simultaneous canopy and enclosure BVOC emission studies"
Keywords:		Atmosphere/*analysis Butadienes/*metabolism *Droughts Environmental Monitoring Hemiterpenes/*metabolism Missouri Monoterpenes/*metabolism Pentanes/*metabolism Plant Leaves/metabolism Quercus/*metabolism Seasons Species Specificity Biogenic emissions Droug;
Notes:		"MedlineGeron, Chris Daly, Ryan Harley, Peter Rasmussen, Rei Seco, Roger Guenther, Alex Karl, Thomas Gu, Lianhong eng Research Support, Non-U.S. Gov't England 2015/12/29 Chemosphere. 2016 Mar; 146:8-21. doi: 10.1016/j.chemosphere.2015.11.086. Epub 2015 Dec 17"