Vertical canopy gradient in photosynthesis and monoterpenoid emissions: An insight into the chemistry and physiology behind
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Authors
Simpraga, M.
Verbeeck, H.
Bloemen, J.
Vanhaecke, L.
Demarcke, M.
Joo, E.
Pokorska, O.
Amelynck, C.
Schoon, N.
Dewulf, J.
Van Langenhove, H.
Heinesch, B.
Aubinet, M.
Steppe, K.
Discipline
Earth and related Environmental sciences
Subject
Beech
Biogenic volatile organic compounds
Carotenoids
Dynamic branch enclosure systems
Monoterpenoids
Physiological status
Specific leaf area
Volatiles
Forestry
Physiology
Pigments
Unsaturated compounds
Photosynthesis
carotenoid
chlorophyll a
isoprenoid
nitrogen
pigment
terpenoid
adult
algorithm
carbon emission
forest ecosystem
leaf
photosynthesis
terpene
tree
volatile organic compound
air temperature
article
beech
canopy
chlorophyll content
circadian rhythm
climate
exhaust gas
gas exchange
growing season
humidity
leaf area
microclimate
nonhuman
photosynthesis
plant height
plant leaf
priority journal
sun exposure
temperate deciduous forest
Carotenoids
Fagus
Forestry
Photosynthesis
Physiology
Pigment
Europe
Audience
Scientific
Date
2013Metadata
Show full item recordDescription
It is well known that vertical canopy gradients and varying sky conditions influence photosynthesis (Pn), specific leaf area (SLA), leaf thickness (LT) and leaf pigments (lutein, â-carotene and chlorophyll). In contrast, little is known about these effects on monoterpenoid (MT) emissions. Our study examines simultaneously measured Pn, MT emissions and the MT/Pn ratio along the canopy of an adult European beech tree (Fagus sylvatica L.) in natural forest conditions. Dynamic branch enclosure systems were used at four heights in the canopy (7, 14, 21 and 25 m) in order to establish relationships and better understand the interaction between Pn and MT emissions under both sunny and cloudy sky conditions. Clear differences in Pn, MT emissions and the MT/Pn ratio were detected within the canopy. The highest Pn rates were observed in the sun leaves at 25 m due to the higher intercepted light levels, whereas MT emissions (and the MT/Pn ratio) were unexpectedly highest in the semi-shaded leaves at 21 m. The higher Pn rates and, apparently contradictory, lower MT emissions in the sun leaves may be explained by the hypothesis of Owen and Peñuelas (2005), stating synthesis of more photo-protective carotenoids may decrease the emissions of volatile isoprenoids (including MTs) because they both share the same biochemical precursors. In addition, leaf traits like SLA, LT and leaf pigments clearly differed with height in the canopy, suggesting that the leaf's physiological status cannot be neglected in future research on biogenic volatile organic compounds (BVOCs) when aiming at developing new and/or improved emission algorithms.
Citation
Simpraga, M.; Verbeeck, H.; Bloemen, J.; Vanhaecke, L.; Demarcke, M.; Joo, E.; Pokorska, O.; Amelynck, C.; Schoon, N.; Dewulf, J.; Van Langenhove, H.; Heinesch, B.; Aubinet, M.; Steppe, K. (2013). Vertical canopy gradient in photosynthesis and monoterpenoid emissions: An insight into the chemistry and physiology behind. , Atmospheric Environment, Vol. 80, 85-95, DOI: 10.1016/j.atmosenv.2013.07.047.Identifiers
scopus: 2-s2.0-84883040518
Type
Article
Peer-Review
Yes
Language
eng