NDLI: Field patterns of temporal variations in the light environment within the crowns of a Mediterranean evergreen tree (Olea europaea)

Content Provider	Springer Nature Link
Author	Ventre Lespiaucq, Agustina B. Escriba Rocafort, Adrián G. Delgado, Juan Antonio Jiménez, María Dolores Casas, Rafael Rubio Granado Yela, Carlos Balaguer, Luis
Copyright Year	2016
Abstract	There are specific diurnal light variation patterns and negligible seasonal variation within tree crowns. Crown-mediated regulation of temporal light regimes can be important for whole plant function in Mediterranean evergreens. The light environment within a tree crown can be characterized by specific variation patterns arising from the structural features of the crown. Within-crown light variation patterns can be important for plant productivity, but this has yet to be assessed in natural settings. The spatio-temporal variations of direct and diffuse photosynthetic photon flux density (PPFD), their proportions and sunfleck frequency within the crowns of isolated adult wild olive trees (Olea europaea L.) were investigated. Trees growing in contrasting Mediterranean conditions (continental vs. coastal) at the same latitude were compared. Instantaneous diffuse and total PPFD were measured with sunshine sensors in three crown layers (outer-, middle- and inner-crown) in the south-facing part of the crown, at two points of the diurnal (mid-morning and midday) and seasonal (summer and winter) cycles. Direct PPFD and the proportion of direct to total PPFD vary diurnally within the crown as a result of an increase in sunfleck frequency during midday and in self-shading during mid-morning, in both summer and winter conditions. Conversely, the lack of seasonal variation in the three light attributes is better explained by a greater average crown transmittance in winter conditions. The interplay between crown architecture heterogeneity and varying solar position renders identifiable patterns of temporal variations in the light environment within tree crowns. These patterns suggest that trees can benefit from the light heterogeneity typical of Mediterranean environments by developing conservative architectural layouts.
Starting Page	995
Ending Page	1009
Page Count	15
File Format	PDF
ISSN	09311890
Journal	Trees
Volume Number	30
Issue Number	3
e-ISSN	14322285
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-12-19
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mediterranean evergreen trees Direct and diffuse PAR Sunflecks Crown transmittance Spatio-temporal light variation Within-crown diurnal and seasonal light variation Olea europaea Forestry Plant Sciences Agriculture Plant Anatomy/Development Plant Pathology Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Ecology Physiology Plant Science Forestry

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Erratum to: Field patterns of temporal variations in the light environment within the crowns of a Mediterranean evergreen tree (Olea europaea)

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Erratum to: Field patterns of temporal variations in the light environment within the crowns of a Mediterranean evergreen tree (Olea europaea)

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