Abstract
Drought has the potential to influence the emission of biogenic volatile organic compounds (BVOCs) from forests and thus affect the oxidative capacity of the atmosphere. Our understanding of these influences is limited, in part, by a lack of field observations on mature trees and the small number of BVOCs monitored. We studied 50- to 60-year-old Pinus ponderosa trees in a semi-arid forest that experience early summer drought followed by late-summer monsoon rains, and observed emissions for five BVOCs—monoterpenes, methylbutenol, methanol, acetaldehyde and acetone. We also constructed a throughfall-interception experiment to create “wetter” and “drier” plots. Generally, trees in drier plots exhibited reduced sap flow, photosynthesis, and stomatal conductances, while BVOC emission rates were unaffected by the artificial drought treatments. During the natural, early summer drought, a physiological threshold appeared to be crossed when photosynthesis ≅2 μmol m−2 s−1 and conductance ≅0.02 mol m−2 s−1. Below this threshold, BVOC emissions are correlated with leaf physiology (photosynthesis and conductance) while BVOC emissions are not correlated with other physicochemical factors (e.g., compound volatility and tissue BVOC concentration) that have been shown in past studies to influence emissions. The proportional loss of C to BVOC emission was highest during the drought primarily due to reduced CO2 assimilation. It appears that seasonal drought changes the relations among BVOC emissions, photosynthesis and conductance. When drought is relaxed, BVOC emission rates are explained mostly by seasonal temperature, but when seasonal drought is maximal, photosynthesis and conductance—the physiological processes which best explain BVOC emission rates—decline, possibly indicating a more direct role of physiology in controlling BVOC emission.
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Acknowledgments
The authors would like to thank Andrew Turnipseed (National Center for Atmospheric Research; NCAR) for the collection of meteorological data and analysis of GC–MS samples, Tiffany Duhl (NCAR) and Gift Pornsawan Poopat (University of Colorado, Boulder) for their help in analyzing the GC–MS samples, and Peter Harley (NCAR) for comments and recommendations on the manuscript. We also thank the US Forest Service Research Laboratory in Fort Collins, and especially Richard Oakes and Dr Michael Ryan for their assistance in facilitating research at the Manitou Experimental Forest. Funding for this research was provided by the National Science Foundation, Division of Atmospheric and Geospace Sciences Grant no. 0919189. The experiments comply with the current laws of the USA, where the research was performed.
Author contribution statement
A. S. D. E., L. L. Y. and A. M. T. conducted the research for the study. R. K. M. conceived the study, provided resources and instruments for the study and obtained funding to conduct the study. A. S. D. E., A. M. T., L. L. Y. and R. K. M. wrote the manuscript and all authors provided editorial advice and contributed to subsequent revisions.
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Communicated by Ylo Niinemets.
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Eller, A.S.D., Young, L.L., Trowbridge, A.M. et al. Differential controls by climate and physiology over the emission rates of biogenic volatile organic compounds from mature trees in a semi-arid pine forest. Oecologia 180, 345–358 (2016). https://doi.org/10.1007/s00442-015-3474-4
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DOI: https://doi.org/10.1007/s00442-015-3474-4