Journal
PLANT CELL AND ENVIRONMENT
Volume 38, Issue 11, Pages 2299-2312Publisher
WILEY
DOI: 10.1111/pce.12550
Keywords
BVOC; chlorophyll fluorescence; hybrid algorithm; monoterpene emission; spring recovery
Categories
Funding
- Academy of Finland Center of Excellence Program [1118615, 272041]
- Nordic Center of Excellence CRAICC
- EU FP7 Expeer I3, funds of the University of Helsinki [490117]
- Graduate school 'Atmospheric Composition and Climate Change: From Molecular Processes to Global Observations and Models - Doctoral Programme (ACCC)'
- Office of Science (BER), U.S. Department of Energy via Biogenic Aerosols - Effects on Clouds and Climate (BAECC)
Ask authors/readers for more resources
Emissions of biogenic volatile organic compounds (BVOC) by boreal evergreen trees have strong seasonality, with low emission rates during photosynthetically inactive winter and increasing rates towards summer. Yet, the regulation of this seasonality remains unclear. We measured in situ monoterpene emissions from Scots pine shoots during several spring periods and analysed their dynamics in connection with the spring recovery of photosynthesis. We found high emission peaks caused by enhanced monoterpene synthesis consistently during every spring period (monoterpene emission bursts, MEB). The timing of the MEBs varied relatively little between the spring periods. The timing of the MEBs showed good agreement with the photosynthetic spring recovery, which was studied with simultaneous measurements of chlorophyll fluorescence, CO2 exchange and a simple, temperature history-based proxy for state of photosynthetic acclimation, S. We conclude that the MEBs were related to the early stages of photosynthetic recovery, when the efficiency of photosynthetic carbon reactions is still low whereas the light harvesting machinery actively absorbs light energy. This suggests that the MEBs may serve a protective functional role for the foliage during this critical transitory state and that these high emission peaks may contribute to atmospheric chemistry in the boreal forest in springtime. Emissions of biogenic volatile organic compounds (BVOC) by boreal evergreen trees have strong seasonality. We measured high emission peaks from Scots pine shoots caused by enhanced monoterpene synthesis taking place simultaneously with the photosynthetic spring recovery. We conclude that the increased emissions were related to the photosynthetic recovery, when the efficiency of photosynthetic carbon reactions is low whereas the light harvesting machinery actively absorbs light energy. Increased emissions may serve a protective functional role for the foliage during the transitory state, and these high emission peaks may contribute to atmospheric chemistry in the boreal forest in springtime.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available