Differential controls by climate and physiology over the emission rates of biogenic volatile organic compounds from mature trees in a semi-arid pine forest

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• 作者：Allyson S. D. Eller ; Lindsay L. Young ; Amy M. Trowbridge ; Russell K. Monson
• 关键词：Terpenoid ; Drought ; Atmospheric chemistry ; Cloud ; condensation nuclei ; Climate change
• 刊名：Oecologia
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：180
• 期：2
• 页码：345-358
• 全文大小：1,373 KB
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• 作者单位：Allyson S. D. Eller (1) (2) (5)
  Lindsay L. Young (1)
  Amy M. Trowbridge (1) (3)
  Russell K. Monson (1) (4)
  
  1. Department of Ecology and Evolutionary Biology and Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, 80301, USA
  2. Department of Biological Sciences, Macquarie University, Sydney, NSW, 2109, Australia
  5. Department of Biology, Bates College, Lewiston, ME, 04240, USA
  3. Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT, 59717, USA
  4. Department of Ecology and Evolutionary Biology and the Laboratory of Tree Ring Research, University of Arizona, Tucson, AZ, 85721, USA
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Ecology
  Plant Sciences
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1939

文摘

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. Keywords Terpenoid Drought Atmospheric chemistry Cloud-condensation nuclei Climate change