@article{8fe9191b81be471b8ad1093ef3861d5c,
title = "Vapor pressure deficit helps explain biogenic volatile organic compound fluxes from the forest floor and canopy of a temperate deciduous forest",
abstract = "Biogenic volatile organic compounds (BVOCs) play critical roles in ecological and earth-system processes. Ecosystem BVOC models rarely include soil and litter fluxes and their accuracy is often challenged by BVOC dynamics during periods of rapid ecosystem change like spring leaf out. We measured BVOC concentrations within the air space of a mixed deciduous forest and used a hybrid Lagrangian/Eulerian canopy transport model to estimate BVOC flux from the forest floor, canopy, and whole ecosystem during spring. Canopy flux measurements were dominated by a large methanol source and small isoprene source during the leaf-out period, consistent with past measurements of leaf ontogeny and theory, and indicative of a BVOC flux situation rarely used in emissions model testing. The contribution of the forest floor to whole-ecosystem BVOC flux is conditional on the compound of interest and is often non-trivial. We created linear models of forest floor, canopy, and whole-ecosystem flux for each study compound and used information criteria-based model selection to find the simplest model with the best fit. Most published BVOC flux models do not include vapor pressure deficit (VPD), but it entered the best canopy, forest floor, and whole-ecosystem BVOC flux model more than any other study variable in the present study. Since VPD is predicted to increase in the future, future studies should investigate how it contributes to BVOC flux through biophysical mechanisms like evaporative demand, leaf temperature and stomatal function.",
keywords = "Inverse model, Isoprene, Methanol, Monoterpenes, Proton transfer reaction mass spectroscopy",
author = "Stoy, {Paul C.} and Trowbridge, {Amy M.} and Siqueira, {Mario B.} and Freire, {Livia Souza} and Phillips, {Richard P.} and Luke Jacobs and Susanne Wiesner and Monson, {Russell K.} and Novick, {Kimberly A.}",
note = "Funding Information: We wish to acknowledge the Indigenous Nations on whose ancestral lands and ceded territories the study took place and recognize that the infrastructure used for this project is built on Indigenous land. We recognize the myaamiki, L{\"e}nape, Bodw{\'e}wadmik, and saawanwa people as past, present, and future caretakers of this land whose stewardship of the region was interrupted through their physical removal by the 1830 Indian Removal Act and through US Assimilation policies explicitly designed to eradicate Indigenous language and ways of being until the 1970s. This research was supported by the US Department of Energy Office of Science (BER) (DE-SC0010845) and a National Science Foundation (NSF) Postdoctoral Research Fellowship in Biology (1309051). Long-term operation of the US-MMS flux tower is made possible with support from the AmeriFlux Management Project, administered by the Department of Energy{\textquoteright}s Lawrence Berkeley National Lab. We thank Tyler Roman, Dr. Berk Knighton, and Ern Trowbridge for logistical support, Aaron Bird Bear and colleagues for cultural knowledge, and Dr. Jeremy Kedzoria for statistical insight. PCS acknowledges support of the Alexander von Humboldt-Foundation, the National Science Foundation Division of Environmental Biology Grant #1552976, and the University of Wisconsin—Madison. This manuscript is to be published as part of a Special Issue honoring the career of Russ Monson. We are grateful for his mentorship and decades of research on volatile organic compound fluxes that inspired the present analysis. Funding Information: We wish to acknowledge the Indigenous Nations on whose ancestral lands and ceded territories the study took place and recognize that the infrastructure used for this project is built on Indigenous land. We recognize the myaamiki, L{\"e}nape, Bodw{\'e}wadmik, and saawanwa people as past, present, and future caretakers of this land whose stewardship of the region was interrupted through their physical removal by the 1830 Indian Removal Act and through US Assimilation policies explicitly designed to eradicate Indigenous language and ways of being until the 1970s. This research was supported by the US Department of Energy Office of Science (BER) (DE-SC0010845) and a National Science Foundation (NSF) Postdoctoral Research Fellowship in Biology (1309051). Long-term operation of the US-MMS flux tower is made possible with support from the AmeriFlux Management Project, administered by the Department of Energy{\textquoteright}s Lawrence Berkeley National Lab. We thank Tyler Roman, Dr. Berk Knighton, and Ern Trowbridge for logistical support, Aaron Bird Bear and colleagues for cultural knowledge, and Dr. Jeremy Kedzoria for statistical insight. PCS acknowledges support of the Alexander von Humboldt-Foundation, the National Science Foundation Division of Environmental Biology Grant #1552976, and the University of Wisconsin—Madison. This manuscript is to be published as part of a Special Issue honoring the career of Russ Monson. We are grateful for his mentorship and decades of research on volatile organic compound fluxes that inspired the present analysis. Publisher Copyright: {\textcopyright} 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.",
year = "2021",
month = dec,
doi = "10.1007/s00442-021-04891-1",
language = "English (US)",
volume = "197",
pages = "971--988",
journal = "Oecologia",
issn = "0029-8549",
publisher = "Springer Verlag",
number = "4",
}