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Vertical canopy gradient in photosynthesis and monoterpenoid emissions: An insight into the chemistry and physiology behind

dc.contributor.authorSimpraga, M.
dc.contributor.authorVerbeeck, H.
dc.contributor.authorBloemen, J.
dc.contributor.authorVanhaecke, L.
dc.contributor.authorDemarcke, M.
dc.contributor.authorJoo, E.
dc.contributor.authorPokorska, O.
dc.contributor.authorAmelynck, C.
dc.contributor.authorSchoon, N.
dc.contributor.authorDewulf, J.
dc.contributor.authorVan Langenhove, H.
dc.contributor.authorHeinesch, B.
dc.contributor.authorAubinet, M.
dc.contributor.authorSteppe, K.
dc.date2013
dc.date.accessioned2016-03-25T11:11:10Z
dc.date.available2016-03-25T11:11:10Z
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/2889
dc.descriptionIt 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.
dc.languageeng
dc.titleVertical canopy gradient in photosynthesis and monoterpenoid emissions: An insight into the chemistry and physiology behind
dc.typeArticle
dc.subject.frascatiEarth and related Environmental sciences
dc.audienceScientific
dc.subject.freeBeech
dc.subject.freeBiogenic volatile organic compounds
dc.subject.freeCarotenoids
dc.subject.freeDynamic branch enclosure systems
dc.subject.freeMonoterpenoids
dc.subject.freePhysiological status
dc.subject.freeSpecific leaf area
dc.subject.freeVolatiles
dc.subject.freeForestry
dc.subject.freePhysiology
dc.subject.freePigments
dc.subject.freeUnsaturated compounds
dc.subject.freePhotosynthesis
dc.subject.freecarotenoid
dc.subject.freechlorophyll a
dc.subject.freeisoprenoid
dc.subject.freenitrogen
dc.subject.freepigment
dc.subject.freeterpenoid
dc.subject.freeadult
dc.subject.freealgorithm
dc.subject.freecarbon emission
dc.subject.freeforest ecosystem
dc.subject.freeleaf
dc.subject.freephotosynthesis
dc.subject.freeterpene
dc.subject.freetree
dc.subject.freevolatile organic compound
dc.subject.freeair temperature
dc.subject.freearticle
dc.subject.freebeech
dc.subject.freecanopy
dc.subject.freechlorophyll content
dc.subject.freecircadian rhythm
dc.subject.freeclimate
dc.subject.freeexhaust gas
dc.subject.freegas exchange
dc.subject.freegrowing season
dc.subject.freehumidity
dc.subject.freeleaf area
dc.subject.freemicroclimate
dc.subject.freenonhuman
dc.subject.freephotosynthesis
dc.subject.freeplant height
dc.subject.freeplant leaf
dc.subject.freepriority journal
dc.subject.freesun exposure
dc.subject.freetemperate deciduous forest
dc.subject.freeCarotenoids
dc.subject.freeFagus
dc.subject.freeForestry
dc.subject.freePhotosynthesis
dc.subject.freePhysiology
dc.subject.freePigment
dc.subject.freeEurope
dc.source.titleAtmospheric Environment
dc.source.volume80
dc.source.page85-95
Orfeo.peerreviewedYes
dc.identifier.doi10.1016/j.atmosenv.2013.07.047
dc.identifier.scopus2-s2.0-84883040518


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