| Title: | Vapor pressure deficit helps explain biogenic volatile organic compound fluxes from the forest floor and canopy of a temperate deciduous forest |
| Author(s): | Stoy PC; Trowbridge AM; Siqueira MB; Freire LS; Phillips RP; Jacobs L; Wiesner S; Monson RK; Novick KA; |
| Address: | "Department of Biological Systems Engineering, University of WI-Madison, Madison, WI, USA. pcstoy@wisc.edu. Department of Atmospheric and Oceanic Sciences, University of WI-Madison, Madison, WI, USA. pcstoy@wisc.edu. Department of Forest and Wildlife Ecology, University of WI-Madison, Madison, WI, USA. pcstoy@wisc.edu. Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT, USA. pcstoy@wisc.edu. Department of Forest and Wildlife Ecology, University of WI-Madison, Madison, WI, USA. Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT, USA. Department of Entomology, University of WI-Madison, Madison, WI, USA. Department of Mechanical Engineering, Universidade de Brasilia, Brasilia, Brazil. Instituto de Ciencias Matematicas E de Computacao, Universidade de Sao Paulo, Sao Carlos, Brazil. Department of Biology, Indiana University, Bloomington, IN, USA. Department of Biological Systems Engineering, University of WI-Madison, Madison, WI, USA. Department of Atmospheric and Oceanic Sciences, University of WI-Madison, Madison, WI, USA. Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, CO, USA. Paul H. O'Neill School of Public and Environmental Affairs, Indiana University, Bloomington, IN, USA" |
| DOI: | 10.1007/s00442-021-04891-1 |
| ISSN/ISBN: | 1432-1939 (Electronic) 0029-8549 (Linking) |
| 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: | Ecosystem Forests Seasons Trees Vapor Pressure *Volatile Organic Compounds Inverse model Isoprene Methanol Monoterpenes Proton transfer reaction mass spectroscopy; |
| Notes: | "MedlineStoy, Paul C Trowbridge, Amy M Siqueira, Mario B Freire, Livia Souza Phillips, Richard P Jacobs, Luke Wiesner, Susanne Monson, Russell K Novick, Kimberly A eng DE-SC0010845/U.S. Department of Energy/ 1552976/National Science Foundation/ 1309051/National Science Foundation/ Germany 2021/03/08 Oecologia. 2021 Dec; 197(4):971-988. doi: 10.1007/s00442-021-04891-1. Epub 2021 Mar 6" |
